jdk8-mips64-public/hotspot: src/share/vm/adlc/formssel.cpp@7fa25f5575c9 (annotated)

src/share/vm/adlc/formssel.cpp@7fa25f5575c9 (annotated)

src/share/vm/adlc/formssel.cpp

Fri, 14 Jun 2013 01:19:56 +0200

author: adlertz
date: Fri, 14 Jun 2013 01:19:56 +0200
changeset 5288: 7fa25f5575c9
parent 5221: f15fe46d8c00
child 5791: c9ccd7b85f20
permissions: -rw-r--r--

8016157: During CTW: C2: assert(!def_outside->member(r)) failed: Use of external LRG overlaps the same LRG defined in this block
Summary: Disable rematerialization for negD node
Reviewed-by: kvn, roland

 /*
  * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 // FORMS.CPP - Definitions for ADL Parser Forms Classes
 #include "adlc.hpp"
 //==============================Instructions===================================
 //------------------------------InstructForm-----------------------------------
 InstructForm::InstructForm(const char *id, bool ideal_only)
   : _ident(id), _ideal_only(ideal_only),
     _localNames(cmpstr, hashstr, Form::arena),
     _effects(cmpstr, hashstr, Form::arena),
     _is_mach_constant(false),
     _has_call(false)
 {
       _ftype = Form::INS;
       _matrule   = NULL;
       _insencode = NULL;
       _constant  = NULL;
       _opcode    = NULL;
       _size      = NULL;
       _attribs   = NULL;
       _predicate = NULL;
       _exprule   = NULL;
       _rewrule   = NULL;
       _format    = NULL;
       _peephole  = NULL;
       _ins_pipe  = NULL;
       _uniq_idx  = NULL;
       _num_uniq  = 0;
       _cisc_spill_operand = Not_cisc_spillable;// Which operand may cisc-spill
       _cisc_spill_alternate = NULL;            // possible cisc replacement
       _cisc_reg_mask_name = NULL;
       _is_cisc_alternate = false;
       _is_short_branch = false;
       _short_branch_form = NULL;
       _alignment = 1;
 }
 InstructForm::InstructForm(const char *id, InstructForm *instr, MatchRule *rule)
   : _ident(id), _ideal_only(false),
     _localNames(instr->_localNames),
     _effects(instr->_effects),
     _is_mach_constant(false),
     _has_call(false)
 {
       _ftype = Form::INS;
       _matrule   = rule;
       _insencode = instr->_insencode;
       _constant  = instr->_constant;
       _opcode    = instr->_opcode;
       _size      = instr->_size;
       _attribs   = instr->_attribs;
       _predicate = instr->_predicate;
       _exprule   = instr->_exprule;
       _rewrule   = instr->_rewrule;
       _format    = instr->_format;
       _peephole  = instr->_peephole;
       _ins_pipe  = instr->_ins_pipe;
       _uniq_idx  = instr->_uniq_idx;
       _num_uniq  = instr->_num_uniq;
       _cisc_spill_operand = Not_cisc_spillable;// Which operand may cisc-spill
       _cisc_spill_alternate = NULL;            // possible cisc replacement
       _cisc_reg_mask_name = NULL;
       _is_cisc_alternate = false;
       _is_short_branch = false;
       _short_branch_form = NULL;
       _alignment = 1;
      // Copy parameters
      const char *name;
      instr->_parameters.reset();
      for (; (name = instr->_parameters.iter()) != NULL;)
        _parameters.addName(name);
 }
 InstructForm::~InstructForm() {
 }
 InstructForm *InstructForm::is_instruction() const {
   return (InstructForm*)this;
 }
 bool InstructForm::ideal_only() const {
   return _ideal_only;
 }
 bool InstructForm::sets_result() const {
   return (_matrule != NULL && _matrule->sets_result());
 }
 bool InstructForm::needs_projections() {
   _components.reset();
   for( Component *comp; (comp = _components.iter()) != NULL; ) {
     if (comp->isa(Component::KILL)) {
       return true;
     }
   }
   return false;
 }
 bool InstructForm::has_temps() {
   if (_matrule) {
     // Examine each component to see if it is a TEMP
     _components.reset();
     // Skip the first component, if already handled as (SET dst (...))
     Component *comp = NULL;
     if (sets_result())  comp = _components.iter();
     while ((comp = _components.iter()) != NULL) {
       if (comp->isa(Component::TEMP)) {
         return true;
       }
     }
   }
   return false;
 }
 uint InstructForm::num_defs_or_kills() {
   uint   defs_or_kills = 0;
   _components.reset();
   for( Component *comp; (comp = _components.iter()) != NULL; ) {
     if( comp->isa(Component::DEF) || comp->isa(Component::KILL) ) {
       ++defs_or_kills;
     }
   }
   return  defs_or_kills;
 }
 // This instruction has an expand rule?
 bool InstructForm::expands() const {
   return ( _exprule != NULL );
 }
 // This instruction has a peephole rule?
 Peephole *InstructForm::peepholes() const {
   return _peephole;
 }
 // This instruction has a peephole rule?
 void InstructForm::append_peephole(Peephole *peephole) {
   if( _peephole == NULL ) {
     _peephole = peephole;
   } else {
     _peephole->append_peephole(peephole);
   }
 }
 // ideal opcode enumeration
 const char *InstructForm::ideal_Opcode( FormDict &globalNames )  const {
   if( !_matrule ) return "Node"; // Something weird
   // Chain rules do not really have ideal Opcodes; use their source
   // operand ideal Opcode instead.
   if( is_simple_chain_rule(globalNames) ) {
     const char *src = _matrule->_rChild->_opType;
     OperandForm *src_op = globalNames[src]->is_operand();
     assert( src_op, "Not operand class of chain rule" );
     if( !src_op->_matrule ) return "Node";
     return src_op->_matrule->_opType;
   }
   // Operand chain rules do not really have ideal Opcodes
   if( _matrule->is_chain_rule(globalNames) )
     return "Node";
   return strcmp(_matrule->_opType,"Set")
     ? _matrule->_opType
     : _matrule->_rChild->_opType;
 }
 // Recursive check on all operands' match rules in my match rule
 bool InstructForm::is_pinned(FormDict &globals) {
   if ( ! _matrule)  return false;
   int  index   = 0;
   if (_matrule->find_type("Goto",          index)) return true;
   if (_matrule->find_type("If",            index)) return true;
   if (_matrule->find_type("CountedLoopEnd",index)) return true;
   if (_matrule->find_type("Return",        index)) return true;
   if (_matrule->find_type("Rethrow",       index)) return true;
   if (_matrule->find_type("TailCall",      index)) return true;
   if (_matrule->find_type("TailJump",      index)) return true;
   if (_matrule->find_type("Halt",          index)) return true;
   if (_matrule->find_type("Jump",          index)) return true;
   return is_parm(globals);
 }
 // Recursive check on all operands' match rules in my match rule
 bool InstructForm::is_projection(FormDict &globals) {
   if ( ! _matrule)  return false;
   int  index   = 0;
   if (_matrule->find_type("Goto",    index)) return true;
   if (_matrule->find_type("Return",  index)) return true;
   if (_matrule->find_type("Rethrow", index)) return true;
   if (_matrule->find_type("TailCall",index)) return true;
   if (_matrule->find_type("TailJump",index)) return true;
   if (_matrule->find_type("Halt",    index)) return true;
   return false;
 }
 // Recursive check on all operands' match rules in my match rule
 bool InstructForm::is_parm(FormDict &globals) {
   if ( ! _matrule)  return false;
   int  index   = 0;
   if (_matrule->find_type("Parm",index)) return true;
   return false;
 }
 bool InstructForm::is_ideal_negD() const {
   return (_matrule && _matrule->_rChild && strcmp(_matrule->_rChild->_opType, "NegD") == 0);
 }
 // Return 'true' if this instruction matches an ideal 'Copy*' node
 int InstructForm::is_ideal_copy() const {
   return _matrule ? _matrule->is_ideal_copy() : 0;
 }
 // Return 'true' if this instruction is too complex to rematerialize.
 int InstructForm::is_expensive() const {
   // We can prove it is cheap if it has an empty encoding.
   // This helps with platform-specific nops like ThreadLocal and RoundFloat.
   if (is_empty_encoding())
     return 0;
   if (is_tls_instruction())
     return 1;
   if (_matrule == NULL)  return 0;
   return _matrule->is_expensive();
 }
 // Has an empty encoding if _size is a constant zero or there
 // are no ins_encode tokens.
 int InstructForm::is_empty_encoding() const {
   if (_insencode != NULL) {
     _insencode->reset();
     if (_insencode->encode_class_iter() == NULL) {
       return 1;
     }
   }
   if (_size != NULL && strcmp(_size, "0") == 0) {
     return 1;
   }
   return 0;
 }
 int InstructForm::is_tls_instruction() const {
   if (_ident != NULL &&
       ( ! strcmp( _ident,"tlsLoadP") ||
         ! strncmp(_ident,"tlsLoadP_",9)) ) {
     return 1;
   }
   if (_matrule != NULL && _insencode != NULL) {
     const char* opType = _matrule->_opType;
     if (strcmp(opType, "Set")==0)
       opType = _matrule->_rChild->_opType;
     if (strcmp(opType,"ThreadLocal")==0) {
       fprintf(stderr, "Warning: ThreadLocal instruction %s should be named 'tlsLoadP_*'\n",
               (_ident == NULL ? "NULL" : _ident));
       return 1;
     }
   }
   return 0;
 }
 // Return 'true' if this instruction matches an ideal 'If' node
 bool InstructForm::is_ideal_if() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_if();
 }
 // Return 'true' if this instruction matches an ideal 'FastLock' node
 bool InstructForm::is_ideal_fastlock() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_fastlock();
 }
 // Return 'true' if this instruction matches an ideal 'MemBarXXX' node
 bool InstructForm::is_ideal_membar() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_membar();
 }
 // Return 'true' if this instruction matches an ideal 'LoadPC' node
 bool InstructForm::is_ideal_loadPC() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_loadPC();
 }
 // Return 'true' if this instruction matches an ideal 'Box' node
 bool InstructForm::is_ideal_box() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_box();
 }
 // Return 'true' if this instruction matches an ideal 'Goto' node
 bool InstructForm::is_ideal_goto() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_goto();
 }
 // Return 'true' if this instruction matches an ideal 'Jump' node
 bool InstructForm::is_ideal_jump() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_jump();
 }
 // Return 'true' if instruction matches ideal 'If' | 'Goto' | 'CountedLoopEnd'
 bool InstructForm::is_ideal_branch() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_if() || _matrule->is_ideal_goto();
 }
 // Return 'true' if this instruction matches an ideal 'Return' node
 bool InstructForm::is_ideal_return() const {
   if( _matrule == NULL ) return false;
   // Check MatchRule to see if the first entry is the ideal "Return" node
   int  index   = 0;
   if (_matrule->find_type("Return",index)) return true;
   if (_matrule->find_type("Rethrow",index)) return true;
   if (_matrule->find_type("TailCall",index)) return true;
   if (_matrule->find_type("TailJump",index)) return true;
   return false;
 }
 // Return 'true' if this instruction matches an ideal 'Halt' node
 bool InstructForm::is_ideal_halt() const {
   int  index   = 0;
   return _matrule && _matrule->find_type("Halt",index);
 }
 // Return 'true' if this instruction matches an ideal 'SafePoint' node
 bool InstructForm::is_ideal_safepoint() const {
   int  index   = 0;
   return _matrule && _matrule->find_type("SafePoint",index);
 }
 // Return 'true' if this instruction matches an ideal 'Nop' node
 bool InstructForm::is_ideal_nop() const {
   return _ident && _ident[0] == 'N' && _ident[1] == 'o' && _ident[2] == 'p' && _ident[3] == '_';
 }
 bool InstructForm::is_ideal_control() const {
   if ( ! _matrule)  return false;
   return is_ideal_return() || is_ideal_branch() || _matrule->is_ideal_jump() || is_ideal_halt();
 }
 // Return 'true' if this instruction matches an ideal 'Call' node
 Form::CallType InstructForm::is_ideal_call() const {
   if( _matrule == NULL ) return Form::invalid_type;
   // Check MatchRule to see if the first entry is the ideal "Call" node
   int  idx   = 0;
   if(_matrule->find_type("CallStaticJava",idx))   return Form::JAVA_STATIC;
   idx = 0;
   if(_matrule->find_type("Lock",idx))             return Form::JAVA_STATIC;
   idx = 0;
   if(_matrule->find_type("Unlock",idx))           return Form::JAVA_STATIC;
   idx = 0;
   if(_matrule->find_type("CallDynamicJava",idx))  return Form::JAVA_DYNAMIC;
   idx = 0;
   if(_matrule->find_type("CallRuntime",idx))      return Form::JAVA_RUNTIME;
   idx = 0;
   if(_matrule->find_type("CallLeaf",idx))         return Form::JAVA_LEAF;
   idx = 0;
   if(_matrule->find_type("CallLeafNoFP",idx))     return Form::JAVA_LEAF;
   idx = 0;
   return Form::invalid_type;
 }
 // Return 'true' if this instruction matches an ideal 'Load?' node
 Form::DataType InstructForm::is_ideal_load() const {
   if( _matrule == NULL ) return Form::none;
   return  _matrule->is_ideal_load();
 }
 // Return 'true' if this instruction matches an ideal 'LoadKlass' node
 bool InstructForm::skip_antidep_check() const {
   if( _matrule == NULL ) return false;
   return  _matrule->skip_antidep_check();
 }
 // Return 'true' if this instruction matches an ideal 'Load?' node
 Form::DataType InstructForm::is_ideal_store() const {
   if( _matrule == NULL ) return Form::none;
   return  _matrule->is_ideal_store();
 }
 // Return 'true' if this instruction matches an ideal vector node
 bool InstructForm::is_vector() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_vector();
 }
 // Return the input register that must match the output register
 // If this is not required, return 0
 uint InstructForm::two_address(FormDict &globals) {
   uint  matching_input = 0;
   if(_components.count() == 0) return 0;
   _components.reset();
   Component *comp = _components.iter();
   // Check if there is a DEF
   if( comp->isa(Component::DEF) ) {
     // Check that this is a register
     const char  *def_type = comp->_type;
     const Form  *form     = globals[def_type];
     OperandForm *op       = form->is_operand();
     if( op ) {
       if( op->constrained_reg_class() != NULL &&
           op->interface_type(globals) == Form::register_interface ) {
         // Remember the local name for equality test later
         const char *def_name = comp->_name;
         // Check if a component has the same name and is a USE
         do {
           if( comp->isa(Component::USE) && strcmp(comp->_name,def_name)==0 ) {
             return operand_position_format(def_name);
           }
         } while( (comp = _components.iter()) != NULL);
       }
     }
   }
   return 0;
 }
 // when chaining a constant to an instruction, returns 'true' and sets opType
 Form::DataType InstructForm::is_chain_of_constant(FormDict &globals) {
   const char *dummy  = NULL;
   const char *dummy2 = NULL;
   return is_chain_of_constant(globals, dummy, dummy2);
 }
 Form::DataType InstructForm::is_chain_of_constant(FormDict &globals,
                 const char * &opTypeParam) {
   const char *result = NULL;
   return is_chain_of_constant(globals, opTypeParam, result);
 }
 Form::DataType InstructForm::is_chain_of_constant(FormDict &globals,
                 const char * &opTypeParam, const char * &resultParam) {
   Form::DataType  data_type = Form::none;
   if ( ! _matrule)  return data_type;
   // !!!!!
   // The source of the chain rule is 'position = 1'
   uint         position = 1;
   const char  *result   = NULL;
   const char  *name     = NULL;
   const char  *opType   = NULL;
   // Here base_operand is looking for an ideal type to be returned (opType).
   if ( _matrule->is_chain_rule(globals)
        && _matrule->base_operand(position, globals, result, name, opType) ) {
     data_type = ideal_to_const_type(opType);
     // if it isn't an ideal constant type, just return
     if ( data_type == Form::none ) return data_type;
     // Ideal constant types also adjust the opType parameter.
     resultParam = result;
     opTypeParam = opType;
     return data_type;
   }
   return data_type;
 }
 // Check if a simple chain rule
 bool InstructForm::is_simple_chain_rule(FormDict &globals) const {
   if( _matrule && _matrule->sets_result()
       && _matrule->_rChild->_lChild == NULL
       && globals[_matrule->_rChild->_opType]
       && globals[_matrule->_rChild->_opType]->is_opclass() ) {
     return true;
   }
   return false;
 }
 // check for structural rematerialization
 bool InstructForm::rematerialize(FormDict &globals, RegisterForm *registers ) {
   bool   rematerialize = false;
   Form::DataType data_type = is_chain_of_constant(globals);
   if( data_type != Form::none )
     rematerialize = true;
   // Ugly: until a better fix is implemented, disable rematerialization for
   // negD nodes because they are proved to be problematic.
   if (is_ideal_negD()) {
     return false;
   }
   // Constants
   if( _components.count() == 1 && _components[0]->is(Component::USE_DEF) )
     rematerialize = true;
   // Pseudo-constants (values easily available to the runtime)
   if (is_empty_encoding() && is_tls_instruction())
     rematerialize = true;
   // 1-input, 1-output, such as copies or increments.
   if( _components.count() == 2 &&
       _components[0]->is(Component::DEF) &&
       _components[1]->isa(Component::USE) )
     rematerialize = true;
   // Check for an ideal 'Load?' and eliminate rematerialize option
   if ( is_ideal_load() != Form::none || // Ideal load?  Do not rematerialize
        is_ideal_copy() != Form::none || // Ideal copy?  Do not rematerialize
        is_expensive()  != Form::none) { // Expensive?   Do not rematerialize
     rematerialize = false;
   }
   // Always rematerialize the flags.  They are more expensive to save &
   // restore than to recompute (and possibly spill the compare's inputs).
   if( _components.count() >= 1 ) {
     Component *c = _components[0];
     const Form *form = globals[c->_type];
     OperandForm *opform = form->is_operand();
     if( opform ) {
       // Avoid the special stack_slots register classes
       const char *rc_name = opform->constrained_reg_class();
       if( rc_name ) {
         if( strcmp(rc_name,"stack_slots") ) {
           // Check for ideal_type of RegFlags
           const char *type = opform->ideal_type( globals, registers );
           if( (type != NULL) && !strcmp(type, "RegFlags") )
             rematerialize = true;
         } else
           rematerialize = false; // Do not rematerialize things target stk
       }
     }
   }
   return rematerialize;
 }
 // loads from memory, so must check for anti-dependence
 bool InstructForm::needs_anti_dependence_check(FormDict &globals) const {
   if ( skip_antidep_check() ) return false;
   // Machine independent loads must be checked for anti-dependences
   if( is_ideal_load() != Form::none )  return true;
   // !!!!! !!!!! !!!!!
   // TEMPORARY
   // if( is_simple_chain_rule(globals) )  return false;
   // String.(compareTo/equals/indexOf) and Arrays.equals use many memorys edges,
   // but writes none
   if( _matrule && _matrule->_rChild &&
       ( strcmp(_matrule->_rChild->_opType,"StrComp"    )==0 ||
         strcmp(_matrule->_rChild->_opType,"StrEquals"  )==0 ||
         strcmp(_matrule->_rChild->_opType,"StrIndexOf" )==0 ||
         strcmp(_matrule->_rChild->_opType,"AryEq"      )==0 ))
     return true;
   // Check if instruction has a USE of a memory operand class, but no defs
   bool USE_of_memory  = false;
   bool DEF_of_memory  = false;
   Component     *comp = NULL;
   ComponentList &components = (ComponentList &)_components;
   components.reset();
   while( (comp = components.iter()) != NULL ) {
     const Form  *form = globals[comp->_type];
     if( !form ) continue;
     OpClassForm *op   = form->is_opclass();
     if( !op ) continue;
     if( form->interface_type(globals) == Form::memory_interface ) {
       if( comp->isa(Component::USE) ) USE_of_memory = true;
       if( comp->isa(Component::DEF) ) {
         OperandForm *oper = form->is_operand();
         if( oper && oper->is_user_name_for_sReg() ) {
           // Stack slots are unaliased memory handled by allocator
           oper = oper;  // debug stopping point !!!!!
         } else {
           DEF_of_memory = true;
         }
       }
     }
   }
   return (USE_of_memory && !DEF_of_memory);
 }
 bool InstructForm::is_wide_memory_kill(FormDict &globals) const {
   if( _matrule == NULL ) return false;
   if( !_matrule->_opType ) return false;
   if( strcmp(_matrule->_opType,"MemBarRelease") == 0 ) return true;
   if( strcmp(_matrule->_opType,"MemBarAcquire") == 0 ) return true;
   if( strcmp(_matrule->_opType,"MemBarReleaseLock") == 0 ) return true;
   if( strcmp(_matrule->_opType,"MemBarAcquireLock") == 0 ) return true;
   if( strcmp(_matrule->_opType,"MemBarStoreStore") == 0 ) return true;
   return false;
 }
 int InstructForm::memory_operand(FormDict &globals) const {
   // Machine independent loads must be checked for anti-dependences
   // Check if instruction has a USE of a memory operand class, or a def.
   int USE_of_memory  = 0;
   int DEF_of_memory  = 0;
   const char*    last_memory_DEF = NULL; // to test DEF/USE pairing in asserts
   Component     *unique          = NULL;
   Component     *comp            = NULL;
   ComponentList &components      = (ComponentList &)_components;
   components.reset();
   while( (comp = components.iter()) != NULL ) {
     const Form  *form = globals[comp->_type];
     if( !form ) continue;
     OpClassForm *op   = form->is_opclass();
     if( !op ) continue;
     if( op->stack_slots_only(globals) )  continue;
     if( form->interface_type(globals) == Form::memory_interface ) {
       if( comp->isa(Component::DEF) ) {
         last_memory_DEF = comp->_name;
         DEF_of_memory++;
         unique = comp;
       } else if( comp->isa(Component::USE) ) {
         if( last_memory_DEF != NULL ) {
           assert(0 == strcmp(last_memory_DEF, comp->_name), "every memory DEF is followed by a USE of the same name");
           last_memory_DEF = NULL;
         }
         USE_of_memory++;
         if (DEF_of_memory == 0)  // defs take precedence
           unique = comp;
       } else {
         assert(last_memory_DEF == NULL, "unpaired memory DEF");
       }
     }
   }
   assert(last_memory_DEF == NULL, "unpaired memory DEF");
   assert(USE_of_memory >= DEF_of_memory, "unpaired memory DEF");
   USE_of_memory -= DEF_of_memory;   // treat paired DEF/USE as one occurrence
   if( (USE_of_memory + DEF_of_memory) > 0 ) {
     if( is_simple_chain_rule(globals) ) {
       //fprintf(stderr, "Warning: chain rule is not really a memory user.\n");
       //((InstructForm*)this)->dump();
       // Preceding code prints nothing on sparc and these insns on intel:
       // leaP8 leaP32 leaPIdxOff leaPIdxScale leaPIdxScaleOff leaP8 leaP32
       // leaPIdxOff leaPIdxScale leaPIdxScaleOff
       return NO_MEMORY_OPERAND;
     }
     if( DEF_of_memory == 1 ) {
       assert(unique != NULL, "");
       if( USE_of_memory == 0 ) {
         // unique def, no uses
       } else {
         // // unique def, some uses
         // // must return bottom unless all uses match def
         // unique = NULL;
       }
     } else if( DEF_of_memory > 0 ) {
       // multiple defs, don't care about uses
       unique = NULL;
     } else if( USE_of_memory == 1) {
       // unique use, no defs
       assert(unique != NULL, "");
     } else if( USE_of_memory > 0 ) {
       // multiple uses, no defs
       unique = NULL;
     } else {
       assert(false, "bad case analysis");
     }
     // process the unique DEF or USE, if there is one
     if( unique == NULL ) {
       return MANY_MEMORY_OPERANDS;
     } else {
       int pos = components.operand_position(unique->_name);
       if( unique->isa(Component::DEF) ) {
         pos += 1;                // get corresponding USE from DEF
       }
       assert(pos >= 1, "I was just looking at it!");
       return pos;
     }
   }
   // missed the memory op??
   if( true ) {  // %%% should not be necessary
     if( is_ideal_store() != Form::none ) {
       fprintf(stderr, "Warning: cannot find memory opnd in instr.\n");
       ((InstructForm*)this)->dump();
       // pretend it has multiple defs and uses
       return MANY_MEMORY_OPERANDS;
     }
     if( is_ideal_load()  != Form::none ) {
       fprintf(stderr, "Warning: cannot find memory opnd in instr.\n");
       ((InstructForm*)this)->dump();
       // pretend it has multiple uses and no defs
       return MANY_MEMORY_OPERANDS;
     }
   }
   return NO_MEMORY_OPERAND;
 }
 // This instruction captures the machine-independent bottom_type
 // Expected use is for pointer vs oop determination for LoadP
 bool InstructForm::captures_bottom_type(FormDict &globals) const {
   if( _matrule && _matrule->_rChild &&
        (!strcmp(_matrule->_rChild->_opType,"CastPP")       ||  // new result type
         !strcmp(_matrule->_rChild->_opType,"CastX2P")      ||  // new result type
         !strcmp(_matrule->_rChild->_opType,"DecodeN")      ||
         !strcmp(_matrule->_rChild->_opType,"EncodeP")      ||
         !strcmp(_matrule->_rChild->_opType,"DecodeNKlass") ||
         !strcmp(_matrule->_rChild->_opType,"EncodePKlass") ||
         !strcmp(_matrule->_rChild->_opType,"LoadN")        ||
         !strcmp(_matrule->_rChild->_opType,"LoadNKlass")   ||
         !strcmp(_matrule->_rChild->_opType,"CreateEx")     ||  // type of exception
         !strcmp(_matrule->_rChild->_opType,"CheckCastPP")  ||
         !strcmp(_matrule->_rChild->_opType,"GetAndSetP")   ||
         !strcmp(_matrule->_rChild->_opType,"GetAndSetN")) )  return true;
   else if ( is_ideal_load() == Form::idealP )                return true;
   else if ( is_ideal_store() != Form::none  )                return true;
   if (needs_base_oop_edge(globals)) return true;
   if (is_vector()) return true;
   if (is_mach_constant()) return true;
   return  false;
 }
 // Access instr_cost attribute or return NULL.
 const char* InstructForm::cost() {
   for (Attribute* cur = _attribs; cur != NULL; cur = (Attribute*)cur->_next) {
     if( strcmp(cur->_ident,AttributeForm::_ins_cost) == 0 ) {
       return cur->_val;
     }
   }
   return NULL;
 }
 // Return count of top-level operands.
 uint InstructForm::num_opnds() {
   int  num_opnds = _components.num_operands();
   // Need special handling for matching some ideal nodes
   // i.e. Matching a return node
   /*
   if( _matrule ) {
     if( strcmp(_matrule->_opType,"Return"   )==0 ||
         strcmp(_matrule->_opType,"Halt"     )==0 )
       return 3;
   }
     */
   return num_opnds;
 }
 const char* InstructForm::opnd_ident(int idx) {
   return _components.at(idx)->_name;
 }
 const char* InstructForm::unique_opnd_ident(uint idx) {
   uint i;
   for (i = 1; i < num_opnds(); ++i) {
     if (unique_opnds_idx(i) == idx) {
       break;
     }
   }
   return (_components.at(i) != NULL) ? _components.at(i)->_name : "";
 }
 // Return count of unmatched operands.
 uint InstructForm::num_post_match_opnds() {
   uint  num_post_match_opnds = _components.count();
   uint  num_match_opnds = _components.match_count();
   num_post_match_opnds = num_post_match_opnds - num_match_opnds;
   return num_post_match_opnds;
 }
 // Return the number of leaves below this complex operand
 uint InstructForm::num_consts(FormDict &globals) const {
   if ( ! _matrule) return 0;
   // This is a recursive invocation on all operands in the matchrule
   return _matrule->num_consts(globals);
 }
 // Constants in match rule with specified type
 uint InstructForm::num_consts(FormDict &globals, Form::DataType type) const {
   if ( ! _matrule) return 0;
   // This is a recursive invocation on all operands in the matchrule
   return _matrule->num_consts(globals, type);
 }
 // Return the register class associated with 'leaf'.
 const char *InstructForm::out_reg_class(FormDict &globals) {
   assert( false, "InstructForm::out_reg_class(FormDict &globals); Not Implemented");
   return NULL;
 }
 // Lookup the starting position of inputs we are interested in wrt. ideal nodes
 uint InstructForm::oper_input_base(FormDict &globals) {
   if( !_matrule ) return 1;     // Skip control for most nodes
   // Need special handling for matching some ideal nodes
   // i.e. Matching a return node
   if( strcmp(_matrule->_opType,"Return"    )==0 ||
       strcmp(_matrule->_opType,"Rethrow"   )==0 ||
       strcmp(_matrule->_opType,"TailCall"  )==0 ||
       strcmp(_matrule->_opType,"TailJump"  )==0 ||
       strcmp(_matrule->_opType,"SafePoint" )==0 ||
       strcmp(_matrule->_opType,"Halt"      )==0 )
     return AdlcVMDeps::Parms;   // Skip the machine-state edges
   if( _matrule->_rChild &&
       ( strcmp(_matrule->_rChild->_opType,"AryEq"     )==0 ||
         strcmp(_matrule->_rChild->_opType,"StrComp"   )==0 ||
         strcmp(_matrule->_rChild->_opType,"StrEquals" )==0 ||
         strcmp(_matrule->_rChild->_opType,"StrIndexOf")==0 ||
         strcmp(_matrule->_rChild->_opType,"EncodeISOArray")==0)) {
         // String.(compareTo/equals/indexOf) and Arrays.equals
         // and sun.nio.cs.iso8859_1$Encoder.EncodeISOArray
         // take 1 control and 1 memory edges.
     return 2;
   }
   // Check for handling of 'Memory' input/edge in the ideal world.
   // The AD file writer is shielded from knowledge of these edges.
   int base = 1;                 // Skip control
   base += _matrule->needs_ideal_memory_edge(globals);
   // Also skip the base-oop value for uses of derived oops.
   // The AD file writer is shielded from knowledge of these edges.
   base += needs_base_oop_edge(globals);
   return base;
 }
 // This function determines the order of the MachOper in _opnds[]
 // by writing the operand names into the _components list.
 //
 // Implementation does not modify state of internal structures
 void InstructForm::build_components() {
   // Add top-level operands to the components
   if (_matrule)  _matrule->append_components(_localNames, _components);
   // Add parameters that "do not appear in match rule".
   bool has_temp = false;
   const char *name;
   const char *kill_name = NULL;
   for (_parameters.reset(); (name = _parameters.iter()) != NULL;) {
     OperandForm *opForm = (OperandForm*)_localNames[name];
     Effect* e = NULL;
     {
       const Form* form = _effects[name];
       e = form ? form->is_effect() : NULL;
     }
     if (e != NULL) {
       has_temp |= e->is(Component::TEMP);
       // KILLs must be declared after any TEMPs because TEMPs are real
       // uses so their operand numbering must directly follow the real
       // inputs from the match rule.  Fixing the numbering seems
       // complex so simply enforce the restriction during parse.
       if (kill_name != NULL &&
           e->isa(Component::TEMP) && !e->isa(Component::DEF)) {
         OperandForm* kill = (OperandForm*)_localNames[kill_name];
         globalAD->syntax_err(_linenum, "%s: %s %s must be at the end of the argument list\n",
                              _ident, kill->_ident, kill_name);
       } else if (e->isa(Component::KILL) && !e->isa(Component::USE)) {
         kill_name = name;
       }
     }
     const Component *component  = _components.search(name);
     if ( component  == NULL ) {
       if (e) {
         _components.insert(name, opForm->_ident, e->_use_def, false);
         component = _components.search(name);
         if (component->isa(Component::USE) && !component->isa(Component::TEMP) && _matrule) {
           const Form *form = globalAD->globalNames()[component->_type];
           assert( form, "component type must be a defined form");
           OperandForm *op   = form->is_operand();
           if (op->_interface && op->_interface->is_RegInterface()) {
             globalAD->syntax_err(_linenum, "%s: illegal USE of non-input: %s %s\n",
                                  _ident, opForm->_ident, name);
           }
         }
       } else {
         // This would be a nice warning but it triggers in a few places in a benign way
         // if (_matrule != NULL && !expands()) {
         //   globalAD->syntax_err(_linenum, "%s: %s %s not mentioned in effect or match rule\n",
         //                        _ident, opForm->_ident, name);
         // }
         _components.insert(name, opForm->_ident, Component::INVALID, false);
       }
     }
     else if (e) {
       // Component was found in the list
       // Check if there is a new effect that requires an extra component.
       // This happens when adding 'USE' to a component that is not yet one.
       if ((!component->isa( Component::USE) && ((e->_use_def & Component::USE) != 0))) {
         if (component->isa(Component::USE) && _matrule) {
           const Form *form = globalAD->globalNames()[component->_type];
           assert( form, "component type must be a defined form");
           OperandForm *op   = form->is_operand();
           if (op->_interface && op->_interface->is_RegInterface()) {
             globalAD->syntax_err(_linenum, "%s: illegal USE of non-input: %s %s\n",
                                  _ident, opForm->_ident, name);
           }
         }
         _components.insert(name, opForm->_ident, e->_use_def, false);
       } else {
         Component  *comp = (Component*)component;
         comp->promote_use_def_info(e->_use_def);
       }
       // Component positions are zero based.
       int  pos  = _components.operand_position(name);
       assert( ! (component->isa(Component::DEF) && (pos >= 1)),
               "Component::DEF can only occur in the first position");
     }
   }
   // Resolving the interactions between expand rules and TEMPs would
   // be complex so simply disallow it.
   if (_matrule == NULL && has_temp) {
     globalAD->syntax_err(_linenum, "%s: TEMPs without match rule isn't supported\n", _ident);
   }
   return;
 }
 // Return zero-based position in component list;  -1 if not in list.
 int   InstructForm::operand_position(const char *name, int usedef) {
   return unique_opnds_idx(_components.operand_position(name, usedef, this));
 }
 int   InstructForm::operand_position_format(const char *name) {
   return unique_opnds_idx(_components.operand_position_format(name, this));
 }
 // Return zero-based position in component list; -1 if not in list.
 int   InstructForm::label_position() {
   return unique_opnds_idx(_components.label_position());
 }
 int   InstructForm::method_position() {
   return unique_opnds_idx(_components.method_position());
 }
 // Return number of relocation entries needed for this instruction.
 uint  InstructForm::reloc(FormDict &globals) {
   uint reloc_entries  = 0;
   // Check for "Call" nodes
   if ( is_ideal_call() )      ++reloc_entries;
   if ( is_ideal_return() )    ++reloc_entries;
   if ( is_ideal_safepoint() ) ++reloc_entries;
   // Check if operands MAYBE oop pointers, by checking for ConP elements
   // Proceed through the leaves of the match-tree and check for ConPs
   if ( _matrule != NULL ) {
     uint         position = 0;
     const char  *result   = NULL;
     const char  *name     = NULL;
     const char  *opType   = NULL;
     while (_matrule->base_operand(position, globals, result, name, opType)) {
       if ( strcmp(opType,"ConP") == 0 ) {
 #ifdef SPARC
         reloc_entries += 2; // 1 for sethi + 1 for setlo
 #else
         ++reloc_entries;
 #endif
       }
       ++position;
     }
   }
   // Above is only a conservative estimate
   // because it did not check contents of operand classes.
   // !!!!! !!!!!
   // Add 1 to reloc info for each operand class in the component list.
   Component  *comp;
   _components.reset();
   while ( (comp = _components.iter()) != NULL ) {
     const Form        *form = globals[comp->_type];
     assert( form, "Did not find component's type in global names");
     const OpClassForm *opc  = form->is_opclass();
     const OperandForm *oper = form->is_operand();
     if ( opc && (oper == NULL) ) {
       ++reloc_entries;
     } else if ( oper ) {
       // floats and doubles loaded out of method's constant pool require reloc info
       Form::DataType type = oper->is_base_constant(globals);
       if ( (type == Form::idealF) || (type == Form::idealD) ) {
         ++reloc_entries;
       }
     }
   }
   // Float and Double constants may come from the CodeBuffer table
   // and require relocatable addresses for access
   // !!!!!
   // Check for any component being an immediate float or double.
   Form::DataType data_type = is_chain_of_constant(globals);
   if( data_type==idealD || data_type==idealF ) {
 #ifdef SPARC
     // sparc required more relocation entries for floating constants
     // (expires 9/98)
     reloc_entries += 6;
 #else
     reloc_entries++;
 #endif
   }
   return reloc_entries;
 }
 // Utility function defined in archDesc.cpp
 extern bool is_def(int usedef);
 // Return the result of reducing an instruction
 const char *InstructForm::reduce_result() {
   const char* result = "Universe";  // default
   _components.reset();
   Component *comp = _components.iter();
   if (comp != NULL && comp->isa(Component::DEF)) {
     result = comp->_type;
     // Override this if the rule is a store operation:
     if (_matrule && _matrule->_rChild &&
         is_store_to_memory(_matrule->_rChild->_opType))
       result = "Universe";
   }
   return result;
 }
 // Return the name of the operand on the right hand side of the binary match
 // Return NULL if there is no right hand side
 const char *InstructForm::reduce_right(FormDict &globals)  const {
   if( _matrule == NULL ) return NULL;
   return  _matrule->reduce_right(globals);
 }
 // Similar for left
 const char *InstructForm::reduce_left(FormDict &globals)   const {
   if( _matrule == NULL ) return NULL;
   return  _matrule->reduce_left(globals);
 }
 // Base class for this instruction, MachNode except for calls
 const char *InstructForm::mach_base_class(FormDict &globals)  const {
   if( is_ideal_call() == Form::JAVA_STATIC ) {
     return "MachCallStaticJavaNode";
   }
   else if( is_ideal_call() == Form::JAVA_DYNAMIC ) {
     return "MachCallDynamicJavaNode";
   }
   else if( is_ideal_call() == Form::JAVA_RUNTIME ) {
     return "MachCallRuntimeNode";
   }
   else if( is_ideal_call() == Form::JAVA_LEAF ) {
     return "MachCallLeafNode";
   }
   else if (is_ideal_return()) {
     return "MachReturnNode";
   }
   else if (is_ideal_halt()) {
     return "MachHaltNode";
   }
   else if (is_ideal_safepoint()) {
     return "MachSafePointNode";
   }
   else if (is_ideal_if()) {
     return "MachIfNode";
   }
   else if (is_ideal_goto()) {
     return "MachGotoNode";
   }
   else if (is_ideal_fastlock()) {
     return "MachFastLockNode";
   }
   else if (is_ideal_nop()) {
     return "MachNopNode";
   }
   else if (is_mach_constant()) {
     return "MachConstantNode";
   }
   else if (captures_bottom_type(globals)) {
     return "MachTypeNode";
   } else {
     return "MachNode";
   }
   assert( false, "ShouldNotReachHere()");
   return NULL;
 }
 // Compare the instruction predicates for textual equality
 bool equivalent_predicates( const InstructForm *instr1, const InstructForm *instr2 ) {
   const Predicate *pred1  = instr1->_predicate;
   const Predicate *pred2  = instr2->_predicate;
   if( pred1 == NULL && pred2 == NULL ) {
     // no predicates means they are identical
     return true;
   }
   if( pred1 != NULL && pred2 != NULL ) {
     // compare the predicates
     if (ADLParser::equivalent_expressions(pred1->_pred, pred2->_pred)) {
       return true;
     }
   }
   return false;
 }
 // Check if this instruction can cisc-spill to 'alternate'
 bool InstructForm::cisc_spills_to(ArchDesc &AD, InstructForm *instr) {
   assert( _matrule != NULL && instr->_matrule != NULL, "must have match rules");
   // Do not replace if a cisc-version has been found.
   if( cisc_spill_operand() != Not_cisc_spillable ) return false;
   int         cisc_spill_operand = Maybe_cisc_spillable;
   char       *result             = NULL;
   char       *result2            = NULL;
   const char *op_name            = NULL;
   const char *reg_type           = NULL;
   FormDict   &globals            = AD.globalNames();
   cisc_spill_operand = _matrule->matchrule_cisc_spill_match(globals, AD.get_registers(), instr->_matrule, op_name, reg_type);
   if( (cisc_spill_operand != Not_cisc_spillable) && (op_name != NULL) && equivalent_predicates(this, instr) ) {
     cisc_spill_operand = operand_position(op_name, Component::USE);
     int def_oper  = operand_position(op_name, Component::DEF);
     if( def_oper == NameList::Not_in_list && instr->num_opnds() == num_opnds()) {
       // Do not support cisc-spilling for destination operands and
       // make sure they have the same number of operands.
       _cisc_spill_alternate = instr;
       instr->set_cisc_alternate(true);
       if( AD._cisc_spill_debug ) {
         fprintf(stderr, "Instruction %s cisc-spills-to %s\n", _ident, instr->_ident);
         fprintf(stderr, "   using operand %s %s at index %d\n", reg_type, op_name, cisc_spill_operand);
       }
       // Record that a stack-version of the reg_mask is needed
       // !!!!!
       OperandForm *oper = (OperandForm*)(globals[reg_type]->is_operand());
       assert( oper != NULL, "cisc-spilling non operand");
       const char *reg_class_name = oper->constrained_reg_class();
       AD.set_stack_or_reg(reg_class_name);
       const char *reg_mask_name  = AD.reg_mask(*oper);
       set_cisc_reg_mask_name(reg_mask_name);
       const char *stack_or_reg_mask_name = AD.stack_or_reg_mask(*oper);
     } else {
       cisc_spill_operand = Not_cisc_spillable;
     }
   } else {
     cisc_spill_operand = Not_cisc_spillable;
   }
   set_cisc_spill_operand(cisc_spill_operand);
   return (cisc_spill_operand != Not_cisc_spillable);
 }
 // Check to see if this instruction can be replaced with the short branch
 // instruction `short-branch'
 bool InstructForm::check_branch_variant(ArchDesc &AD, InstructForm *short_branch) {
   if (_matrule != NULL &&
       this != short_branch &&   // Don't match myself
       !is_short_branch() &&     // Don't match another short branch variant
       reduce_result() != NULL &&
       strcmp(reduce_result(), short_branch->reduce_result()) == 0 &&
       _matrule->equivalent(AD.globalNames(), short_branch->_matrule)) {
     // The instructions are equivalent.
     // Now verify that both instructions have the same parameters and
     // the same effects. Both branch forms should have the same inputs
     // and resulting projections to correctly replace a long branch node
     // with corresponding short branch node during code generation.
     bool different = false;
     if (short_branch->_components.count() != _components.count()) {
        different = true;
     } else if (_components.count() > 0) {
       short_branch->_components.reset();
       _components.reset();
       Component *comp;
       while ((comp = _components.iter()) != NULL) {
         Component *short_comp = short_branch->_components.iter();
         if (short_comp == NULL ||
             short_comp->_type != comp->_type ||
             short_comp->_usedef != comp->_usedef) {
           different = true;
           break;
         }
       }
       if (short_branch->_components.iter() != NULL)
         different = true;
     }
     if (different) {
       globalAD->syntax_err(short_branch->_linenum, "Instruction %s and its short form %s have different parameters\n", _ident, short_branch->_ident);
     }
     if (AD._adl_debug > 1 || AD._short_branch_debug) {
       fprintf(stderr, "Instruction %s has short form %s\n", _ident, short_branch->_ident);
     }
     _short_branch_form = short_branch;
     return true;
   }
   return false;
 }
 // --------------------------- FILE *output_routines
 //
 // Generate the format call for the replacement variable
 void InstructForm::rep_var_format(FILE *fp, const char *rep_var) {
   // Handle special constant table variables.
   if (strcmp(rep_var, "constanttablebase") == 0) {
     fprintf(fp, "char reg[128];  ra->dump_register(in(mach_constant_base_node_input()), reg);\n");
     fprintf(fp, "    st->print(\"%%s\", reg);\n");
     return;
   }
   if (strcmp(rep_var, "constantoffset") == 0) {
     fprintf(fp, "st->print(\"#%%d\", constant_offset());\n");
     return;
   }
   if (strcmp(rep_var, "constantaddress") == 0) {
     fprintf(fp, "st->print(\"constant table base + #%%d\", constant_offset());\n");
     return;
   }
   // Find replacement variable's type
   const Form *form   = _localNames[rep_var];
   if (form == NULL) {
     globalAD->syntax_err(_linenum, "Unknown replacement variable %s in format statement of %s.",
                          rep_var, _ident);
     return;
   }
   OpClassForm *opc   = form->is_opclass();
   assert( opc, "replacement variable was not found in local names");
   // Lookup the index position of the replacement variable
   int idx  = operand_position_format(rep_var);
   if ( idx == -1 ) {
     globalAD->syntax_err(_linenum, "Could not find replacement variable %s in format statement of %s.\n",
                          rep_var, _ident);
     assert(strcmp(opc->_ident, "label") == 0, "Unimplemented");
     return;
   }
   if (is_noninput_operand(idx)) {
     // This component isn't in the input array.  Print out the static
     // name of the register.
     OperandForm* oper = form->is_operand();
     if (oper != NULL && oper->is_bound_register()) {
       const RegDef* first = oper->get_RegClass()->find_first_elem();
       fprintf(fp, "    st->print(\"%s\");\n", first->_regname);
     } else {
       globalAD->syntax_err(_linenum, "In %s can't find format for %s %s", _ident, opc->_ident, rep_var);
     }
   } else {
     // Output the format call for this operand
     fprintf(fp,"opnd_array(%d)->",idx);
     if (idx == 0)
       fprintf(fp,"int_format(ra, this, st); // %s\n", rep_var);
     else
       fprintf(fp,"ext_format(ra, this,idx%d, st); // %s\n", idx, rep_var );
   }
 }
 // Seach through operands to determine parameters unique positions.
 void InstructForm::set_unique_opnds() {
   uint* uniq_idx = NULL;
   uint  nopnds = num_opnds();
   uint  num_uniq = nopnds;
   uint i;
   _uniq_idx_length = 0;
   if (nopnds > 0) {
     // Allocate index array.  Worst case we're mapping from each
     // component back to an index and any DEF always goes at 0 so the
     // length of the array has to be the number of components + 1.
     _uniq_idx_length = _components.count() + 1;
     uniq_idx = (uint*) malloc(sizeof(uint) * _uniq_idx_length);
     for (i = 0; i < _uniq_idx_length; i++) {
       uniq_idx[i] = i;
     }
   }
   // Do it only if there is a match rule and no expand rule.  With an
   // expand rule it is done by creating new mach node in Expand()
   // method.
   if (nopnds > 0 && _matrule != NULL && _exprule == NULL) {
     const char *name;
     uint count;
     bool has_dupl_use = false;
     _parameters.reset();
     while ((name = _parameters.iter()) != NULL) {
       count = 0;
       uint position = 0;
       uint uniq_position = 0;
       _components.reset();
       Component *comp = NULL;
       if (sets_result()) {
         comp = _components.iter();
         position++;
       }
       // The next code is copied from the method operand_position().
       for (; (comp = _components.iter()) != NULL; ++position) {
         // When the first component is not a DEF,
         // leave space for the result operand!
         if (position==0 && (!comp->isa(Component::DEF))) {
           ++position;
         }
         if (strcmp(name, comp->_name) == 0) {
           if (++count > 1) {
             assert(position < _uniq_idx_length, "out of bounds");
             uniq_idx[position] = uniq_position;
             has_dupl_use = true;
           } else {
             uniq_position = position;
           }
         }
         if (comp->isa(Component::DEF) && comp->isa(Component::USE)) {
           ++position;
           if (position != 1)
             --position;   // only use two slots for the 1st USE_DEF
         }
       }
     }
     if (has_dupl_use) {
       for (i = 1; i < nopnds; i++) {
         if (i != uniq_idx[i]) {
           break;
         }
       }
       uint j = i;
       for (; i < nopnds; i++) {
         if (i == uniq_idx[i]) {
           uniq_idx[i] = j++;
         }
       }
       num_uniq = j;
     }
   }
   _uniq_idx = uniq_idx;
   _num_uniq = num_uniq;
 }
 // Generate index values needed for determining the operand position
 void InstructForm::index_temps(FILE *fp, FormDict &globals, const char *prefix, const char *receiver) {
   uint  idx = 0;                  // position of operand in match rule
   int   cur_num_opnds = num_opnds();
   // Compute the index into vector of operand pointers:
   // idx0=0 is used to indicate that info comes from this same node, not from input edge.
   // idx1 starts at oper_input_base()
   if ( cur_num_opnds >= 1 ) {
     fprintf(fp,"  // Start at oper_input_base() and count operands\n");
     fprintf(fp,"  unsigned %sidx0 = %d;\n", prefix, oper_input_base(globals));
     fprintf(fp,"  unsigned %sidx1 = %d;", prefix, oper_input_base(globals));
     fprintf(fp," \t// %s\n", unique_opnd_ident(1));
     // Generate starting points for other unique operands if they exist
     for ( idx = 2; idx < num_unique_opnds(); ++idx ) {
       if( *receiver == 0 ) {
         fprintf(fp,"  unsigned %sidx%d = %sidx%d + opnd_array(%d)->num_edges();",
                 prefix, idx, prefix, idx-1, idx-1 );
       } else {
         fprintf(fp,"  unsigned %sidx%d = %sidx%d + %s_opnds[%d]->num_edges();",
                 prefix, idx, prefix, idx-1, receiver, idx-1 );
       }
       fprintf(fp," \t// %s\n", unique_opnd_ident(idx));
     }
   }
   if( *receiver != 0 ) {
     // This value is used by generate_peepreplace when copying a node.
     // Don't emit it in other cases since it can hide bugs with the
     // use invalid idx's.
     fprintf(fp,"  unsigned %sidx%d = %sreq(); \n", prefix, idx, receiver);
   }
 }
 // ---------------------------
 bool InstructForm::verify() {
   // !!!!! !!!!!
   // Check that a "label" operand occurs last in the operand list, if present
   return true;
 }
 void InstructForm::dump() {
   output(stderr);
 }
 void InstructForm::output(FILE *fp) {
   fprintf(fp,"\nInstruction: %s\n", (_ident?_ident:""));
   if (_matrule)   _matrule->output(fp);
   if (_insencode) _insencode->output(fp);
   if (_constant)  _constant->output(fp);
   if (_opcode)    _opcode->output(fp);
   if (_attribs)   _attribs->output(fp);
   if (_predicate) _predicate->output(fp);
   if (_effects.Size()) {
     fprintf(fp,"Effects\n");
     _effects.dump();
   }
   if (_exprule)   _exprule->output(fp);
   if (_rewrule)   _rewrule->output(fp);
   if (_format)    _format->output(fp);
   if (_peephole)  _peephole->output(fp);
 }
 void MachNodeForm::dump() {
   output(stderr);
 }
 void MachNodeForm::output(FILE *fp) {
   fprintf(fp,"\nMachNode: %s\n", (_ident?_ident:""));
 }
 //------------------------------build_predicate--------------------------------
 // Build instruction predicates.  If the user uses the same operand name
 // twice, we need to check that the operands are pointer-eequivalent in
 // the DFA during the labeling process.
 Predicate *InstructForm::build_predicate() {
   char buf[1024], *s=buf;
   Dict names(cmpstr,hashstr,Form::arena);       // Map Names to counts
   MatchNode *mnode =
     strcmp(_matrule->_opType, "Set") ? _matrule : _matrule->_rChild;
   mnode->count_instr_names(names);
   uint first = 1;
   // Start with the predicate supplied in the .ad file.
   if( _predicate ) {
     if( first ) first=0;
     strcpy(s,"("); s += strlen(s);
     strcpy(s,_predicate->_pred);
     s += strlen(s);
     strcpy(s,")"); s += strlen(s);
   }
   for( DictI i(&names); i.test(); ++i ) {
     uintptr_t cnt = (uintptr_t)i._value;
     if( cnt > 1 ) {             // Need a predicate at all?
       assert( cnt == 2, "Unimplemented" );
       // Handle many pairs
       if( first ) first=0;
       else {                    // All tests must pass, so use '&&'
         strcpy(s," && ");
         s += strlen(s);
       }
       // Add predicate to working buffer
       sprintf(s,"/*%s*/(",(char*)i._key);
       s += strlen(s);
       mnode->build_instr_pred(s,(char*)i._key,0);
       s += strlen(s);
       strcpy(s," == "); s += strlen(s);
       mnode->build_instr_pred(s,(char*)i._key,1);
       s += strlen(s);
       strcpy(s,")"); s += strlen(s);
     }
   }
   if( s == buf ) s = NULL;
   else {
     assert( strlen(buf) < sizeof(buf), "String buffer overflow" );
     s = strdup(buf);
   }
   return new Predicate(s);
 }
 //------------------------------EncodeForm-------------------------------------
 // Constructor
 EncodeForm::EncodeForm()
   : _encClass(cmpstr,hashstr, Form::arena) {
 }
 EncodeForm::~EncodeForm() {
 }
 // record a new register class
 EncClass *EncodeForm::add_EncClass(const char *className) {
   EncClass *encClass = new EncClass(className);
   _eclasses.addName(className);
   _encClass.Insert(className,encClass);
   return encClass;
 }
 // Lookup the function body for an encoding class
 EncClass  *EncodeForm::encClass(const char *className) {
   assert( className != NULL, "Must provide a defined encoding name");
   EncClass *encClass = (EncClass*)_encClass[className];
   return encClass;
 }
 // Lookup the function body for an encoding class
 const char *EncodeForm::encClassBody(const char *className) {
   if( className == NULL ) return NULL;
   EncClass *encClass = (EncClass*)_encClass[className];
   assert( encClass != NULL, "Encode Class is missing.");
   encClass->_code.reset();
   const char *code = (const char*)encClass->_code.iter();
   assert( code != NULL, "Found an empty encode class body.");
   return code;
 }
 // Lookup the function body for an encoding class
 const char *EncodeForm::encClassPrototype(const char *className) {
   assert( className != NULL, "Encode class name must be non NULL.");
   return className;
 }
 void EncodeForm::dump() {                  // Debug printer
   output(stderr);
 }
 void EncodeForm::output(FILE *fp) {          // Write info to output files
   const char *name;
   fprintf(fp,"\n");
   fprintf(fp,"-------------------- Dump EncodeForm --------------------\n");
   for (_eclasses.reset(); (name = _eclasses.iter()) != NULL;) {
     ((EncClass*)_encClass[name])->output(fp);
   }
   fprintf(fp,"-------------------- end  EncodeForm --------------------\n");
 }
 //------------------------------EncClass---------------------------------------
 EncClass::EncClass(const char *name)
   : _localNames(cmpstr,hashstr, Form::arena), _name(name) {
 }
 EncClass::~EncClass() {
 }
 // Add a parameter <type,name> pair
 void EncClass::add_parameter(const char *parameter_type, const char *parameter_name) {
   _parameter_type.addName( parameter_type );
   _parameter_name.addName( parameter_name );
 }
 // Verify operand types in parameter list
 bool EncClass::check_parameter_types(FormDict &globals) {
   // !!!!!
   return false;
 }
 // Add the decomposed "code" sections of an encoding's code-block
 void EncClass::add_code(const char *code) {
   _code.addName(code);
 }
 // Add the decomposed "replacement variables" of an encoding's code-block
 void EncClass::add_rep_var(char *replacement_var) {
   _code.addName(NameList::_signal);
   _rep_vars.addName(replacement_var);
 }
 // Lookup the function body for an encoding class
 int EncClass::rep_var_index(const char *rep_var) {
   uint        position = 0;
   const char *name     = NULL;
   _parameter_name.reset();
   while ( (name = _parameter_name.iter()) != NULL ) {
     if ( strcmp(rep_var,name) == 0 ) return position;
     ++position;
   }
   return -1;
 }
 // Check after parsing
 bool EncClass::verify() {
   // 1!!!!
   // Check that each replacement variable, '$name' in architecture description
   // is actually a local variable for this encode class, or a reserved name
   // "primary, secondary, tertiary"
   return true;
 }
 void EncClass::dump() {
   output(stderr);
 }
 // Write info to output files
 void EncClass::output(FILE *fp) {
   fprintf(fp,"EncClass: %s", (_name ? _name : ""));
   // Output the parameter list
   _parameter_type.reset();
   _parameter_name.reset();
   const char *type = _parameter_type.iter();
   const char *name = _parameter_name.iter();
   fprintf(fp, " ( ");
   for ( ; (type != NULL) && (name != NULL);
         (type = _parameter_type.iter()), (name = _parameter_name.iter()) ) {
     fprintf(fp, " %s %s,", type, name);
   }
   fprintf(fp, " ) ");
   // Output the code block
   _code.reset();
   _rep_vars.reset();
   const char *code;
   while ( (code = _code.iter()) != NULL ) {
     if ( _code.is_signal(code) ) {
       // A replacement variable
       const char *rep_var = _rep_vars.iter();
       fprintf(fp,"($%s)", rep_var);
     } else {
       // A section of code
       fprintf(fp,"%s", code);
     }
   }
 }
 //------------------------------Opcode-----------------------------------------
 Opcode::Opcode(char *primary, char *secondary, char *tertiary)
   : _primary(primary), _secondary(secondary), _tertiary(tertiary) {
 }
 Opcode::~Opcode() {
 }
 Opcode::opcode_type Opcode::as_opcode_type(const char *param) {
   if( strcmp(param,"primary") == 0 ) {
     return Opcode::PRIMARY;
   }
   else if( strcmp(param,"secondary") == 0 ) {
     return Opcode::SECONDARY;
   }
   else if( strcmp(param,"tertiary") == 0 ) {
     return Opcode::TERTIARY;
   }
   return Opcode::NOT_AN_OPCODE;
 }
 bool Opcode::print_opcode(FILE *fp, Opcode::opcode_type desired_opcode) {
   // Default values previously provided by MachNode::primary()...
   const char *description = NULL;
   const char *value       = NULL;
   // Check if user provided any opcode definitions
   if( this != NULL ) {
     // Update 'value' if user provided a definition in the instruction
     switch (desired_opcode) {
     case PRIMARY:
       description = "primary()";
       if( _primary   != NULL)  { value = _primary;     }
       break;
     case SECONDARY:
       description = "secondary()";
       if( _secondary != NULL ) { value = _secondary;   }
       break;
     case TERTIARY:
       description = "tertiary()";
       if( _tertiary  != NULL ) { value = _tertiary;    }
       break;
     default:
       assert( false, "ShouldNotReachHere();");
       break;
     }
   }
   if (value != NULL) {
     fprintf(fp, "(%s /*%s*/)", value, description);
   }
   return value != NULL;
 }
 void Opcode::dump() {
   output(stderr);
 }
 // Write info to output files
 void Opcode::output(FILE *fp) {
   if (_primary   != NULL) fprintf(fp,"Primary   opcode: %s\n", _primary);
   if (_secondary != NULL) fprintf(fp,"Secondary opcode: %s\n", _secondary);
   if (_tertiary  != NULL) fprintf(fp,"Tertiary  opcode: %s\n", _tertiary);
 }
 //------------------------------InsEncode--------------------------------------
 InsEncode::InsEncode() {
 }
 InsEncode::~InsEncode() {
 }
 // Add "encode class name" and its parameters
 NameAndList *InsEncode::add_encode(char *encoding) {
   assert( encoding != NULL, "Must provide name for encoding");
   // add_parameter(NameList::_signal);
   NameAndList *encode = new NameAndList(encoding);
   _encoding.addName((char*)encode);
   return encode;
 }
 // Access the list of encodings
 void InsEncode::reset() {
   _encoding.reset();
   // _parameter.reset();
 }
 const char* InsEncode::encode_class_iter() {
   NameAndList  *encode_class = (NameAndList*)_encoding.iter();
   return  ( encode_class != NULL ? encode_class->name() : NULL );
 }
 // Obtain parameter name from zero based index
 const char *InsEncode::rep_var_name(InstructForm &inst, uint param_no) {
   NameAndList *params = (NameAndList*)_encoding.current();
   assert( params != NULL, "Internal Error");
   const char *param = (*params)[param_no];
   // Remove '$' if parser placed it there.
   return ( param != NULL && *param == '$') ? (param+1) : param;
 }
 void InsEncode::dump() {
   output(stderr);
 }
 // Write info to output files
 void InsEncode::output(FILE *fp) {
   NameAndList *encoding  = NULL;
   const char  *parameter = NULL;
   fprintf(fp,"InsEncode: ");
   _encoding.reset();
   while ( (encoding = (NameAndList*)_encoding.iter()) != 0 ) {
     // Output the encoding being used
     fprintf(fp,"%s(", encoding->name() );
     // Output its parameter list, if any
     bool first_param = true;
     encoding->reset();
     while (  (parameter = encoding->iter()) != 0 ) {
       // Output the ',' between parameters
       if ( ! first_param )  fprintf(fp,", ");
       first_param = false;
       // Output the parameter
       fprintf(fp,"%s", parameter);
     } // done with parameters
     fprintf(fp,")  ");
   } // done with encodings
   fprintf(fp,"\n");
 }
 //------------------------------Effect-----------------------------------------
 static int effect_lookup(const char *name) {
   if(!strcmp(name, "USE")) return Component::USE;
   if(!strcmp(name, "DEF")) return Component::DEF;
   if(!strcmp(name, "USE_DEF")) return Component::USE_DEF;
   if(!strcmp(name, "KILL")) return Component::KILL;
   if(!strcmp(name, "USE_KILL")) return Component::USE_KILL;
   if(!strcmp(name, "TEMP")) return Component::TEMP;
   if(!strcmp(name, "INVALID")) return Component::INVALID;
   if(!strcmp(name, "CALL")) return Component::CALL;
   assert( false,"Invalid effect name specified\n");
   return Component::INVALID;
 }
 const char *Component::getUsedefName() {
   switch (_usedef) {
     case Component::INVALID:  return "INVALID";  break;
     case Component::USE:      return "USE";      break;
     case Component::USE_DEF:  return "USE_DEF";  break;
     case Component::USE_KILL: return "USE_KILL"; break;
     case Component::KILL:     return "KILL";     break;
     case Component::TEMP:     return "TEMP";     break;
     case Component::DEF:      return "DEF";      break;
     case Component::CALL:     return "CALL";     break;
     default: assert(false, "unknown effect");
   }
   return "Undefined Use/Def info";
 }
 Effect::Effect(const char *name) : _name(name), _use_def(effect_lookup(name)) {
   _ftype = Form::EFF;
 }
 Effect::~Effect() {
 }
 // Dynamic type check
 Effect *Effect::is_effect() const {
   return (Effect*)this;
 }
 // True if this component is equal to the parameter.
 bool Effect::is(int use_def_kill_enum) const {
   return (_use_def == use_def_kill_enum ? true : false);
 }
 // True if this component is used/def'd/kill'd as the parameter suggests.
 bool Effect::isa(int use_def_kill_enum) const {
   return (_use_def & use_def_kill_enum) == use_def_kill_enum;
 }
 void Effect::dump() {
   output(stderr);
 }
 void Effect::output(FILE *fp) {          // Write info to output files
   fprintf(fp,"Effect: %s\n", (_name?_name:""));
 }
 //------------------------------ExpandRule-------------------------------------
 ExpandRule::ExpandRule() : _expand_instrs(),
                            _newopconst(cmpstr, hashstr, Form::arena) {
   _ftype = Form::EXP;
 }
 ExpandRule::~ExpandRule() {                  // Destructor
 }
 void ExpandRule::add_instruction(NameAndList *instruction_name_and_operand_list) {
   _expand_instrs.addName((char*)instruction_name_and_operand_list);
 }
 void ExpandRule::reset_instructions() {
   _expand_instrs.reset();
 }
 NameAndList* ExpandRule::iter_instructions() {
   return (NameAndList*)_expand_instrs.iter();
 }
 void ExpandRule::dump() {
   output(stderr);
 }
 void ExpandRule::output(FILE *fp) {         // Write info to output files
   NameAndList *expand_instr = NULL;
   const char *opid = NULL;
   fprintf(fp,"\nExpand Rule:\n");
   // Iterate over the instructions 'node' expands into
   for(reset_instructions(); (expand_instr = iter_instructions()) != NULL; ) {
     fprintf(fp,"%s(", expand_instr->name());
     // iterate over the operand list
     for( expand_instr->reset(); (opid = expand_instr->iter()) != NULL; ) {
       fprintf(fp,"%s ", opid);
     }
     fprintf(fp,");\n");
   }
 }
 //------------------------------RewriteRule------------------------------------
 RewriteRule::RewriteRule(char* params, char* block)
   : _tempParams(params), _tempBlock(block) { };  // Constructor
 RewriteRule::~RewriteRule() {                 // Destructor
 }
 void RewriteRule::dump() {
   output(stderr);
 }
 void RewriteRule::output(FILE *fp) {         // Write info to output files
   fprintf(fp,"\nRewrite Rule:\n%s\n%s\n",
           (_tempParams?_tempParams:""),
           (_tempBlock?_tempBlock:""));
 }
 //==============================MachNodes======================================
 //------------------------------MachNodeForm-----------------------------------
 MachNodeForm::MachNodeForm(char *id)
   : _ident(id) {
 }
 MachNodeForm::~MachNodeForm() {
 }
 MachNodeForm *MachNodeForm::is_machnode() const {
   return (MachNodeForm*)this;
 }
 //==============================Operand Classes================================
 //------------------------------OpClassForm------------------------------------
 OpClassForm::OpClassForm(const char* id) : _ident(id) {
   _ftype = Form::OPCLASS;
 }
 OpClassForm::~OpClassForm() {
 }
 bool OpClassForm::ideal_only() const { return 0; }
 OpClassForm *OpClassForm::is_opclass() const {
   return (OpClassForm*)this;
 }
 Form::InterfaceType OpClassForm::interface_type(FormDict &globals) const {
   if( _oplst.count() == 0 ) return Form::no_interface;
   // Check that my operands have the same interface type
   Form::InterfaceType  interface;
   bool  first = true;
   NameList &op_list = (NameList &)_oplst;
   op_list.reset();
   const char *op_name;
   while( (op_name = op_list.iter()) != NULL ) {
     const Form  *form    = globals[op_name];
     OperandForm *operand = form->is_operand();
     assert( operand, "Entry in operand class that is not an operand");
     if( first ) {
       first     = false;
       interface = operand->interface_type(globals);
     } else {
       interface = (interface == operand->interface_type(globals) ? interface : Form::no_interface);
     }
   }
   return interface;
 }
 bool OpClassForm::stack_slots_only(FormDict &globals) const {
   if( _oplst.count() == 0 ) return false;  // how?
   NameList &op_list = (NameList &)_oplst;
   op_list.reset();
   const char *op_name;
   while( (op_name = op_list.iter()) != NULL ) {
     const Form  *form    = globals[op_name];
     OperandForm *operand = form->is_operand();
     assert( operand, "Entry in operand class that is not an operand");
     if( !operand->stack_slots_only(globals) )  return false;
   }
   return true;
 }
 void OpClassForm::dump() {
   output(stderr);
 }
 void OpClassForm::output(FILE *fp) {
   const char *name;
   fprintf(fp,"\nOperand Class: %s\n", (_ident?_ident:""));
   fprintf(fp,"\nCount = %d\n", _oplst.count());
   for(_oplst.reset(); (name = _oplst.iter()) != NULL;) {
     fprintf(fp,"%s, ",name);
   }
   fprintf(fp,"\n");
 }
 //==============================Operands=======================================
 //------------------------------OperandForm------------------------------------
 OperandForm::OperandForm(const char* id)
   : OpClassForm(id), _ideal_only(false),
     _localNames(cmpstr, hashstr, Form::arena) {
       _ftype = Form::OPER;
       _matrule   = NULL;
       _interface = NULL;
       _attribs   = NULL;
       _predicate = NULL;
       _constraint= NULL;
       _construct = NULL;
       _format    = NULL;
 }
 OperandForm::OperandForm(const char* id, bool ideal_only)
   : OpClassForm(id), _ideal_only(ideal_only),
     _localNames(cmpstr, hashstr, Form::arena) {
       _ftype = Form::OPER;
       _matrule   = NULL;
       _interface = NULL;
       _attribs   = NULL;
       _predicate = NULL;
       _constraint= NULL;
       _construct = NULL;
       _format    = NULL;
 }
 OperandForm::~OperandForm() {
 }
 OperandForm *OperandForm::is_operand() const {
   return (OperandForm*)this;
 }
 bool OperandForm::ideal_only() const {
   return _ideal_only;
 }
 Form::InterfaceType OperandForm::interface_type(FormDict &globals) const {
   if( _interface == NULL )  return Form::no_interface;
   return _interface->interface_type(globals);
 }
 bool OperandForm::stack_slots_only(FormDict &globals) const {
   if( _constraint == NULL )  return false;
   return _constraint->stack_slots_only();
 }
 // Access op_cost attribute or return NULL.
 const char* OperandForm::cost() {
   for (Attribute* cur = _attribs; cur != NULL; cur = (Attribute*)cur->_next) {
     if( strcmp(cur->_ident,AttributeForm::_op_cost) == 0 ) {
       return cur->_val;
     }
   }
   return NULL;
 }
 // Return the number of leaves below this complex operand
 uint OperandForm::num_leaves() const {
   if ( ! _matrule) return 0;
   int num_leaves = _matrule->_numleaves;
   return num_leaves;
 }
 // Return the number of constants contained within this complex operand
 uint OperandForm::num_consts(FormDict &globals) const {
   if ( ! _matrule) return 0;
   // This is a recursive invocation on all operands in the matchrule
   return _matrule->num_consts(globals);
 }
 // Return the number of constants in match rule with specified type
 uint OperandForm::num_consts(FormDict &globals, Form::DataType type) const {
   if ( ! _matrule) return 0;
   // This is a recursive invocation on all operands in the matchrule
   return _matrule->num_consts(globals, type);
 }
 // Return the number of pointer constants contained within this complex operand
 uint OperandForm::num_const_ptrs(FormDict &globals) const {
   if ( ! _matrule) return 0;
   // This is a recursive invocation on all operands in the matchrule
   return _matrule->num_const_ptrs(globals);
 }
 uint OperandForm::num_edges(FormDict &globals) const {
   uint edges  = 0;
   uint leaves = num_leaves();
   uint consts = num_consts(globals);
   // If we are matching a constant directly, there are no leaves.
   edges = ( leaves > consts ) ? leaves - consts : 0;
   // !!!!!
   // Special case operands that do not have a corresponding ideal node.
   if( (edges == 0) && (consts == 0) ) {
     if( constrained_reg_class() != NULL ) {
       edges = 1;
     } else {
       if( _matrule
           && (_matrule->_lChild == NULL) && (_matrule->_rChild == NULL) ) {
         const Form *form = globals[_matrule->_opType];
         OperandForm *oper = form ? form->is_operand() : NULL;
         if( oper ) {
           return oper->num_edges(globals);
         }
       }
     }
   }
   return edges;
 }
 // Check if this operand is usable for cisc-spilling
 bool  OperandForm::is_cisc_reg(FormDict &globals) const {
   const char *ideal = ideal_type(globals);
   bool is_cisc_reg = (ideal && (ideal_to_Reg_type(ideal) != none));
   return is_cisc_reg;
 }
 bool  OpClassForm::is_cisc_mem(FormDict &globals) const {
   Form::InterfaceType my_interface = interface_type(globals);
   return (my_interface == memory_interface);
 }
 // node matches ideal 'Bool'
 bool OperandForm::is_ideal_bool() const {
   if( _matrule == NULL ) return false;
   return _matrule->is_ideal_bool();
 }
 // Require user's name for an sRegX to be stackSlotX
 Form::DataType OperandForm::is_user_name_for_sReg() const {
   DataType data_type = none;
   if( _ident != NULL ) {
     if(      strcmp(_ident,"stackSlotI") == 0 ) data_type = Form::idealI;
     else if( strcmp(_ident,"stackSlotP") == 0 ) data_type = Form::idealP;
     else if( strcmp(_ident,"stackSlotD") == 0 ) data_type = Form::idealD;
     else if( strcmp(_ident,"stackSlotF") == 0 ) data_type = Form::idealF;
     else if( strcmp(_ident,"stackSlotL") == 0 ) data_type = Form::idealL;
   }
   assert((data_type == none) || (_matrule == NULL), "No match-rule for stackSlotX");
   return data_type;
 }
 // Return ideal type, if there is a single ideal type for this operand
 const char *OperandForm::ideal_type(FormDict &globals, RegisterForm *registers) const {
   const char *type = NULL;
   if (ideal_only()) type = _ident;
   else if( _matrule == NULL ) {
     // Check for condition code register
     const char *rc_name = constrained_reg_class();
     // !!!!!
     if (rc_name == NULL) return NULL;
     // !!!!! !!!!!
     // Check constraints on result's register class
     if( registers ) {
       RegClass *reg_class  = registers->getRegClass(rc_name);
       assert( reg_class != NULL, "Register class is not defined");
       // Check for ideal type of entries in register class, all are the same type
       reg_class->reset();
       RegDef *reg_def = reg_class->RegDef_iter();
       assert( reg_def != NULL, "No entries in register class");
       assert( reg_def->_idealtype != NULL, "Did not define ideal type for register");
       // Return substring that names the register's ideal type
       type = reg_def->_idealtype + 3;
       assert( *(reg_def->_idealtype + 0) == 'O', "Expect Op_ prefix");
       assert( *(reg_def->_idealtype + 1) == 'p', "Expect Op_ prefix");
       assert( *(reg_def->_idealtype + 2) == '_', "Expect Op_ prefix");
     }
   }
   else if( _matrule->_lChild == NULL && _matrule->_rChild == NULL ) {
     // This operand matches a single type, at the top level.
     // Check for ideal type
     type = _matrule->_opType;
     if( strcmp(type,"Bool") == 0 )
       return "Bool";
     // transitive lookup
     const Form *frm = globals[type];
     OperandForm *op = frm->is_operand();
     type = op->ideal_type(globals, registers);
   }
   return type;
 }
 // If there is a single ideal type for this interface field, return it.
 const char *OperandForm::interface_ideal_type(FormDict &globals,
                                               const char *field) const {
   const char  *ideal_type = NULL;
   const char  *value      = NULL;
   // Check if "field" is valid for this operand's interface
   if ( ! is_interface_field(field, value) )   return ideal_type;
   // !!!!! !!!!! !!!!!
   // If a valid field has a constant value, identify "ConI" or "ConP" or ...
   // Else, lookup type of field's replacement variable
   return ideal_type;
 }
 RegClass* OperandForm::get_RegClass() const {
   if (_interface && !_interface->is_RegInterface()) return NULL;
   return globalAD->get_registers()->getRegClass(constrained_reg_class());
 }
 bool OperandForm::is_bound_register() const {
   RegClass* reg_class = get_RegClass();
   if (reg_class == NULL) {
     return false;
   }
   const char* name = ideal_type(globalAD->globalNames());
   if (name == NULL) {
     return false;
   }
   uint size = 0;
   if (strcmp(name, "RegFlags") == 0) size = 1;
   if (strcmp(name, "RegI") == 0) size = 1;
   if (strcmp(name, "RegF") == 0) size = 1;
   if (strcmp(name, "RegD") == 0) size = 2;
   if (strcmp(name, "RegL") == 0) size = 2;
   if (strcmp(name, "RegN") == 0) size = 1;
   if (strcmp(name, "RegP") == 0) size = globalAD->get_preproc_def("_LP64") ? 2 : 1;
   if (size == 0) {
     return false;
   }
   return size == reg_class->size();
 }
 // Check if this is a valid field for this operand,
 // Return 'true' if valid, and set the value to the string the user provided.
 bool  OperandForm::is_interface_field(const char *field,
                                       const char * &value) const {
   return false;
 }
 // Return register class name if a constraint specifies the register class.
 const char *OperandForm::constrained_reg_class() const {
   const char *reg_class  = NULL;
   if ( _constraint ) {
     // !!!!!
     Constraint *constraint = _constraint;
     if ( strcmp(_constraint->_func,"ALLOC_IN_RC") == 0 ) {
       reg_class = _constraint->_arg;
     }
   }
   return reg_class;
 }
 // Return the register class associated with 'leaf'.
 const char *OperandForm::in_reg_class(uint leaf, FormDict &globals) {
   const char *reg_class = NULL; // "RegMask::Empty";
   if((_matrule == NULL) || (_matrule->is_chain_rule(globals))) {
     reg_class = constrained_reg_class();
     return reg_class;
   }
   const char *result   = NULL;
   const char *name     = NULL;
   const char *type     = NULL;
   // iterate through all base operands
   // until we reach the register that corresponds to "leaf"
   // This function is not looking for an ideal type.  It needs the first
   // level user type associated with the leaf.
   for(uint idx = 0;_matrule->base_operand(idx,globals,result,name,type);++idx) {
     const Form *form = (_localNames[name] ? _localNames[name] : globals[result]);
     OperandForm *oper = form ? form->is_operand() : NULL;
     if( oper ) {
       reg_class = oper->constrained_reg_class();
       if( reg_class ) {
         reg_class = reg_class;
       } else {
         // ShouldNotReachHere();
       }
     } else {
       // ShouldNotReachHere();
     }
     // Increment our target leaf position if current leaf is not a candidate.
     if( reg_class == NULL)    ++leaf;
     // Exit the loop with the value of reg_class when at the correct index
     if( idx == leaf )         break;
     // May iterate through all base operands if reg_class for 'leaf' is NULL
   }
   return reg_class;
 }
 // Recursive call to construct list of top-level operands.
 // Implementation does not modify state of internal structures
 void OperandForm::build_components() {
   if (_matrule)  _matrule->append_components(_localNames, _components);
   // Add parameters that "do not appear in match rule".
   const char *name;
   for (_parameters.reset(); (name = _parameters.iter()) != NULL;) {
     OperandForm *opForm = (OperandForm*)_localNames[name];
     if ( _components.operand_position(name) == -1 ) {
       _components.insert(name, opForm->_ident, Component::INVALID, false);
     }
   }
   return;
 }
 int OperandForm::operand_position(const char *name, int usedef) {
   return _components.operand_position(name, usedef, this);
 }
 // Return zero-based position in component list, only counting constants;
 // Return -1 if not in list.
 int OperandForm::constant_position(FormDict &globals, const Component *last) {
   // Iterate through components and count constants preceding 'constant'
   int position = 0;
   Component *comp;
   _components.reset();
   while( (comp = _components.iter()) != NULL  && (comp != last) ) {
     // Special case for operands that take a single user-defined operand
     // Skip the initial definition in the component list.
     if( strcmp(comp->_name,this->_ident) == 0 ) continue;
     const char *type = comp->_type;
     // Lookup operand form for replacement variable's type
     const Form *form = globals[type];
     assert( form != NULL, "Component's type not found");
     OperandForm *oper = form ? form->is_operand() : NULL;
     if( oper ) {
       if( oper->_matrule->is_base_constant(globals) != Form::none ) {
         ++position;
       }
     }
   }
   // Check for being passed a component that was not in the list
   if( comp != last )  position = -1;
   return position;
 }
 // Provide position of constant by "name"
 int OperandForm::constant_position(FormDict &globals, const char *name) {
   const Component *comp = _components.search(name);
   int idx = constant_position( globals, comp );
   return idx;
 }
 // Return zero-based position in component list, only counting constants;
 // Return -1 if not in list.
 int OperandForm::register_position(FormDict &globals, const char *reg_name) {
   // Iterate through components and count registers preceding 'last'
   uint  position = 0;
   Component *comp;
   _components.reset();
   while( (comp = _components.iter()) != NULL
          && (strcmp(comp->_name,reg_name) != 0) ) {
     // Special case for operands that take a single user-defined operand
     // Skip the initial definition in the component list.
     if( strcmp(comp->_name,this->_ident) == 0 ) continue;
     const char *type = comp->_type;
     // Lookup operand form for component's type
     const Form *form = globals[type];
     assert( form != NULL, "Component's type not found");
     OperandForm *oper = form ? form->is_operand() : NULL;
     if( oper ) {
       if( oper->_matrule->is_base_register(globals) ) {
         ++position;
       }
     }
   }
   return position;
 }
 const char *OperandForm::reduce_result()  const {
   return _ident;
 }
 // Return the name of the operand on the right hand side of the binary match
 // Return NULL if there is no right hand side
 const char *OperandForm::reduce_right(FormDict &globals)  const {
   return  ( _matrule ? _matrule->reduce_right(globals) : NULL );
 }
 // Similar for left
 const char *OperandForm::reduce_left(FormDict &globals)   const {
   return  ( _matrule ? _matrule->reduce_left(globals) : NULL );
 }
 // --------------------------- FILE *output_routines
 //
 // Output code for disp_is_oop, if true.
 void OperandForm::disp_is_oop(FILE *fp, FormDict &globals) {
   //  Check it is a memory interface with a non-user-constant disp field
   if ( this->_interface == NULL ) return;
   MemInterface *mem_interface = this->_interface->is_MemInterface();
   if ( mem_interface == NULL )    return;
   const char   *disp  = mem_interface->_disp;
   if ( *disp != '$' )             return;
   // Lookup replacement variable in operand's component list
   const char   *rep_var = disp + 1;
   const Component *comp = this->_components.search(rep_var);
   assert( comp != NULL, "Replacement variable not found in components");
   // Lookup operand form for replacement variable's type
   const char      *type = comp->_type;
   Form            *form = (Form*)globals[type];
   assert( form != NULL, "Replacement variable's type not found");
   OperandForm     *op   = form->is_operand();
   assert( op, "Memory Interface 'disp' can only emit an operand form");
   // Check if this is a ConP, which may require relocation
   if ( op->is_base_constant(globals) == Form::idealP ) {
     // Find the constant's index:  _c0, _c1, _c2, ... , _cN
     uint idx  = op->constant_position( globals, rep_var);
     fprintf(fp,"  virtual relocInfo::relocType disp_reloc() const {");
     fprintf(fp,  "  return _c%d->reloc();", idx);
     fprintf(fp, " }\n");
   }
 }
 // Generate code for internal and external format methods
 //
 // internal access to reg# node->_idx
 // access to subsumed constant _c0, _c1,
 void  OperandForm::int_format(FILE *fp, FormDict &globals, uint index) {
   Form::DataType dtype;
   if (_matrule && (_matrule->is_base_register(globals) ||
                    strcmp(ideal_type(globalAD->globalNames()), "RegFlags") == 0)) {
     // !!!!! !!!!!
     fprintf(fp,"  { char reg_str[128];\n");
     fprintf(fp,"    ra->dump_register(node,reg_str);\n");
     fprintf(fp,"    st->print(\"%cs\",reg_str);\n",'%');
     fprintf(fp,"  }\n");
   } else if (_matrule && (dtype = _matrule->is_base_constant(globals)) != Form::none) {
     format_constant( fp, index, dtype );
   } else if (ideal_to_sReg_type(_ident) != Form::none) {
     // Special format for Stack Slot Register
     fprintf(fp,"  { char reg_str[128];\n");
     fprintf(fp,"    ra->dump_register(node,reg_str);\n");
     fprintf(fp,"    st->print(\"%cs\",reg_str);\n",'%');
     fprintf(fp,"  }\n");
   } else {
     fprintf(fp,"  st->print(\"No format defined for %s\n\");\n", _ident);
     fflush(fp);
     fprintf(stderr,"No format defined for %s\n", _ident);
     dump();
     assert( false,"Internal error:\n  output_internal_operand() attempting to output other than a Register or Constant");
   }
 }
 // Similar to "int_format" but for cases where data is external to operand
 // external access to reg# node->in(idx)->_idx,
 void  OperandForm::ext_format(FILE *fp, FormDict &globals, uint index) {
   Form::DataType dtype;
   if (_matrule && (_matrule->is_base_register(globals) ||
                    strcmp(ideal_type(globalAD->globalNames()), "RegFlags") == 0)) {
     fprintf(fp,"  { char reg_str[128];\n");
     fprintf(fp,"    ra->dump_register(node->in(idx");
     if ( index != 0 ) fprintf(fp,              "+%d",index);
     fprintf(fp,                                      "),reg_str);\n");
     fprintf(fp,"    st->print(\"%cs\",reg_str);\n",'%');
     fprintf(fp,"  }\n");
   } else if (_matrule && (dtype = _matrule->is_base_constant(globals)) != Form::none) {
     format_constant( fp, index, dtype );
   } else if (ideal_to_sReg_type(_ident) != Form::none) {
     // Special format for Stack Slot Register
     fprintf(fp,"  { char reg_str[128];\n");
     fprintf(fp,"    ra->dump_register(node->in(idx");
     if ( index != 0 ) fprintf(fp,                  "+%d",index);
     fprintf(fp,                                       "),reg_str);\n");
     fprintf(fp,"    st->print(\"%cs\",reg_str);\n",'%');
     fprintf(fp,"  }\n");
   } else {
     fprintf(fp,"  st->print(\"No format defined for %s\n\");\n", _ident);
     assert( false,"Internal error:\n  output_external_operand() attempting to output other than a Register or Constant");
   }
 }
 void OperandForm::format_constant(FILE *fp, uint const_index, uint const_type) {
   switch(const_type) {
   case Form::idealI: fprintf(fp,"  st->print(\"#%%d\", _c%d);\n", const_index); break;
   case Form::idealP: fprintf(fp,"  if (_c%d) _c%d->dump_on(st);\n", const_index, const_index); break;
   case Form::idealNKlass:
   case Form::idealN: fprintf(fp,"  if (_c%d) _c%d->dump_on(st);\n", const_index, const_index); break;
   case Form::idealL: fprintf(fp,"  st->print(\"#%%lld\", _c%d);\n", const_index); break;
   case Form::idealF: fprintf(fp,"  st->print(\"#%%f\", _c%d);\n", const_index); break;
   case Form::idealD: fprintf(fp,"  st->print(\"#%%f\", _c%d);\n", const_index); break;
   default:
     assert( false, "ShouldNotReachHere()");
   }
 }
 // Return the operand form corresponding to the given index, else NULL.
 OperandForm *OperandForm::constant_operand(FormDict &globals,
                                            uint      index) {
   // !!!!!
   // Check behavior on complex operands
   uint n_consts = num_consts(globals);
   if( n_consts > 0 ) {
     uint i = 0;
     const char *type;
     Component  *comp;
     _components.reset();
     if ((comp = _components.iter()) == NULL) {
       assert(n_consts == 1, "Bad component list detected.\n");
       // Current operand is THE operand
       if ( index == 0 ) {
         return this;
       }
     } // end if NULL
     else {
       // Skip the first component, it can not be a DEF of a constant
       do {
         type = comp->base_type(globals);
         // Check that "type" is a 'ConI', 'ConP', ...
         if ( ideal_to_const_type(type) != Form::none ) {
           // When at correct component, get corresponding Operand
           if ( index == 0 ) {
             return globals[comp->_type]->is_operand();
           }
           // Decrement number of constants to go
           --index;
         }
       } while((comp = _components.iter()) != NULL);
     }
   }
   // Did not find a constant for this index.
   return NULL;
 }
 // If this operand has a single ideal type, return its type
 Form::DataType OperandForm::simple_type(FormDict &globals) const {
   const char *type_name = ideal_type(globals);
   Form::DataType type   = type_name ? ideal_to_const_type( type_name )
                                     : Form::none;
   return type;
 }
 Form::DataType OperandForm::is_base_constant(FormDict &globals) const {
   if ( _matrule == NULL )    return Form::none;
   return _matrule->is_base_constant(globals);
 }
 // "true" if this operand is a simple type that is swallowed
 bool  OperandForm::swallowed(FormDict &globals) const {
   Form::DataType type   = simple_type(globals);
   if( type != Form::none ) {
     return true;
   }
   return false;
 }
 // Output code to access the value of the index'th constant
 void OperandForm::access_constant(FILE *fp, FormDict &globals,
                                   uint const_index) {
   OperandForm *oper = constant_operand(globals, const_index);
   assert( oper, "Index exceeds number of constants in operand");
   Form::DataType dtype = oper->is_base_constant(globals);
   switch(dtype) {
   case idealI: fprintf(fp,"_c%d",           const_index); break;
   case idealP: fprintf(fp,"_c%d->get_con()",const_index); break;
   case idealL: fprintf(fp,"_c%d",           const_index); break;
   case idealF: fprintf(fp,"_c%d",           const_index); break;
   case idealD: fprintf(fp,"_c%d",           const_index); break;
   default:
     assert( false, "ShouldNotReachHere()");
   }
 }
 void OperandForm::dump() {
   output(stderr);
 }
 void OperandForm::output(FILE *fp) {
   fprintf(fp,"\nOperand: %s\n", (_ident?_ident:""));
   if (_matrule)    _matrule->dump();
   if (_interface)  _interface->dump();
   if (_attribs)    _attribs->dump();
   if (_predicate)  _predicate->dump();
   if (_constraint) _constraint->dump();
   if (_construct)  _construct->dump();
   if (_format)     _format->dump();
 }
 //------------------------------Constraint-------------------------------------
 Constraint::Constraint(const char *func, const char *arg)
   : _func(func), _arg(arg) {
 }
 Constraint::~Constraint() { /* not owner of char* */
 }
 bool Constraint::stack_slots_only() const {
   return strcmp(_func, "ALLOC_IN_RC") == 0
       && strcmp(_arg,  "stack_slots") == 0;
 }
 void Constraint::dump() {
   output(stderr);
 }
 void Constraint::output(FILE *fp) {           // Write info to output files
   assert((_func != NULL && _arg != NULL),"missing constraint function or arg");
   fprintf(fp,"Constraint: %s ( %s )\n", _func, _arg);
 }
 //------------------------------Predicate--------------------------------------
 Predicate::Predicate(char *pr)
   : _pred(pr) {
 }
 Predicate::~Predicate() {
 }
 void Predicate::dump() {
   output(stderr);
 }
 void Predicate::output(FILE *fp) {
   fprintf(fp,"Predicate");  // Write to output files
 }
 //------------------------------Interface--------------------------------------
 Interface::Interface(const char *name) : _name(name) {
 }
 Interface::~Interface() {
 }
 Form::InterfaceType Interface::interface_type(FormDict &globals) const {
   Interface *thsi = (Interface*)this;
   if ( thsi->is_RegInterface()   ) return Form::register_interface;
   if ( thsi->is_MemInterface()   ) return Form::memory_interface;
   if ( thsi->is_ConstInterface() ) return Form::constant_interface;
   if ( thsi->is_CondInterface()  ) return Form::conditional_interface;
   return Form::no_interface;
 }
 RegInterface   *Interface::is_RegInterface() {
   if ( strcmp(_name,"REG_INTER") != 0 )
     return NULL;
   return (RegInterface*)this;
 }
 MemInterface   *Interface::is_MemInterface() {
   if ( strcmp(_name,"MEMORY_INTER") != 0 )  return NULL;
   return (MemInterface*)this;
 }
 ConstInterface *Interface::is_ConstInterface() {
   if ( strcmp(_name,"CONST_INTER") != 0 )  return NULL;
   return (ConstInterface*)this;
 }
 CondInterface  *Interface::is_CondInterface() {
   if ( strcmp(_name,"COND_INTER") != 0 )  return NULL;
   return (CondInterface*)this;
 }
 void Interface::dump() {
   output(stderr);
 }
 // Write info to output files
 void Interface::output(FILE *fp) {
   fprintf(fp,"Interface: %s\n", (_name ? _name : "") );
 }
 //------------------------------RegInterface-----------------------------------
 RegInterface::RegInterface() : Interface("REG_INTER") {
 }
 RegInterface::~RegInterface() {
 }
 void RegInterface::dump() {
   output(stderr);
 }
 // Write info to output files
 void RegInterface::output(FILE *fp) {
   Interface::output(fp);
 }
 //------------------------------ConstInterface---------------------------------
 ConstInterface::ConstInterface() : Interface("CONST_INTER") {
 }
 ConstInterface::~ConstInterface() {
 }
 void ConstInterface::dump() {
   output(stderr);
 }
 // Write info to output files
 void ConstInterface::output(FILE *fp) {
   Interface::output(fp);
 }
 //------------------------------MemInterface-----------------------------------
 MemInterface::MemInterface(char *base, char *index, char *scale, char *disp)
   : Interface("MEMORY_INTER"), _base(base), _index(index), _scale(scale), _disp(disp) {
 }
 MemInterface::~MemInterface() {
   // not owner of any character arrays
 }
 void MemInterface::dump() {
   output(stderr);
 }
 // Write info to output files
 void MemInterface::output(FILE *fp) {
   Interface::output(fp);
   if ( _base  != NULL ) fprintf(fp,"  base  == %s\n", _base);
   if ( _index != NULL ) fprintf(fp,"  index == %s\n", _index);
   if ( _scale != NULL ) fprintf(fp,"  scale == %s\n", _scale);
   if ( _disp  != NULL ) fprintf(fp,"  disp  == %s\n", _disp);
   // fprintf(fp,"\n");
 }
 //------------------------------CondInterface----------------------------------
 CondInterface::CondInterface(const char* equal,         const char* equal_format,
                              const char* not_equal,     const char* not_equal_format,
                              const char* less,          const char* less_format,
                              const char* greater_equal, const char* greater_equal_format,
                              const char* less_equal,    const char* less_equal_format,
                              const char* greater,       const char* greater_format)
   : Interface("COND_INTER"),
     _equal(equal),                 _equal_format(equal_format),
     _not_equal(not_equal),         _not_equal_format(not_equal_format),
     _less(less),                   _less_format(less_format),
     _greater_equal(greater_equal), _greater_equal_format(greater_equal_format),
     _less_equal(less_equal),       _less_equal_format(less_equal_format),
     _greater(greater),             _greater_format(greater_format) {
 }
 CondInterface::~CondInterface() {
   // not owner of any character arrays
 }
 void CondInterface::dump() {
   output(stderr);
 }
 // Write info to output files
 void CondInterface::output(FILE *fp) {
   Interface::output(fp);
   if ( _equal  != NULL )     fprintf(fp," equal       == %s\n", _equal);
   if ( _not_equal  != NULL ) fprintf(fp," not_equal   == %s\n", _not_equal);
   if ( _less  != NULL )      fprintf(fp," less        == %s\n", _less);
   if ( _greater_equal  != NULL ) fprintf(fp," greater_equal   == %s\n", _greater_equal);
   if ( _less_equal  != NULL ) fprintf(fp," less_equal  == %s\n", _less_equal);
   if ( _greater  != NULL )    fprintf(fp," greater     == %s\n", _greater);
   // fprintf(fp,"\n");
 }
 //------------------------------ConstructRule----------------------------------
 ConstructRule::ConstructRule(char *cnstr)
   : _construct(cnstr) {
 }
 ConstructRule::~ConstructRule() {
 }
 void ConstructRule::dump() {
   output(stderr);
 }
 void ConstructRule::output(FILE *fp) {
   fprintf(fp,"\nConstruct Rule\n");  // Write to output files
 }
 //==============================Shared Forms===================================
 //------------------------------AttributeForm----------------------------------
 int         AttributeForm::_insId   = 0;           // start counter at 0
 int         AttributeForm::_opId    = 0;           // start counter at 0
 const char* AttributeForm::_ins_cost = "ins_cost"; // required name
 const char* AttributeForm::_op_cost  = "op_cost";  // required name
 AttributeForm::AttributeForm(char *attr, int type, char *attrdef)
   : Form(Form::ATTR), _attrname(attr), _atype(type), _attrdef(attrdef) {
     if (type==OP_ATTR) {
       id = ++_opId;
     }
     else if (type==INS_ATTR) {
       id = ++_insId;
     }
     else assert( false,"");
 }
 AttributeForm::~AttributeForm() {
 }
 // Dynamic type check
 AttributeForm *AttributeForm::is_attribute() const {
   return (AttributeForm*)this;
 }
 // inlined  // int  AttributeForm::type() { return id;}
 void AttributeForm::dump() {
   output(stderr);
 }
 void AttributeForm::output(FILE *fp) {
   if( _attrname && _attrdef ) {
     fprintf(fp,"\n// AttributeForm \nstatic const int %s = %s;\n",
             _attrname, _attrdef);
   }
   else {
     fprintf(fp,"\n// AttributeForm missing name %s or definition %s\n",
             (_attrname?_attrname:""), (_attrdef?_attrdef:"") );
   }
 }
 //------------------------------Component--------------------------------------
 Component::Component(const char *name, const char *type, int usedef)
   : _name(name), _type(type), _usedef(usedef) {
     _ftype = Form::COMP;
 }
 Component::~Component() {
 }
 // True if this component is equal to the parameter.
 bool Component::is(int use_def_kill_enum) const {
   return (_usedef == use_def_kill_enum ? true : false);
 }
 // True if this component is used/def'd/kill'd as the parameter suggests.
 bool Component::isa(int use_def_kill_enum) const {
   return (_usedef & use_def_kill_enum) == use_def_kill_enum;
 }
 // Extend this component with additional use/def/kill behavior
 int Component::promote_use_def_info(int new_use_def) {
   _usedef |= new_use_def;
   return _usedef;
 }
 // Check the base type of this component, if it has one
 const char *Component::base_type(FormDict &globals) {
   const Form *frm = globals[_type];
   if (frm == NULL) return NULL;
   OperandForm *op = frm->is_operand();
   if (op == NULL) return NULL;
   if (op->ideal_only()) return op->_ident;
   return (char *)op->ideal_type(globals);
 }
 void Component::dump() {
   output(stderr);
 }
 void Component::output(FILE *fp) {
   fprintf(fp,"Component:");  // Write to output files
   fprintf(fp, "  name = %s", _name);
   fprintf(fp, ", type = %s", _type);
   assert(_usedef != 0, "unknown effect");
   fprintf(fp, ", use/def = %s\n", getUsedefName());
 }
 //------------------------------ComponentList---------------------------------
 ComponentList::ComponentList() : NameList(), _matchcnt(0) {
 }
 ComponentList::~ComponentList() {
   // // This list may not own its elements if copied via assignment
   // Component *component;
   // for (reset(); (component = iter()) != NULL;) {
   //   delete component;
   // }
 }
 void   ComponentList::insert(Component *component, bool mflag) {
   NameList::addName((char *)component);
   if(mflag) _matchcnt++;
 }
 void   ComponentList::insert(const char *name, const char *opType, int usedef,
                              bool mflag) {
   Component * component = new Component(name, opType, usedef);
   insert(component, mflag);
 }
 Component *ComponentList::current() { return (Component*)NameList::current(); }
 Component *ComponentList::iter()    { return (Component*)NameList::iter(); }
 Component *ComponentList::match_iter() {
   if(_iter < _matchcnt) return (Component*)NameList::iter();
   return NULL;
 }
 Component *ComponentList::post_match_iter() {
   Component *comp = iter();
   // At end of list?
   if ( comp == NULL ) {
     return comp;
   }
   // In post-match components?
   if (_iter > match_count()-1) {
     return comp;
   }
   return post_match_iter();
 }
 void       ComponentList::reset()   { NameList::reset(); }
 int        ComponentList::count()   { return NameList::count(); }
 Component *ComponentList::operator[](int position) {
   // Shortcut complete iteration if there are not enough entries
   if (position >= count()) return NULL;
   int        index     = 0;
   Component *component = NULL;
   for (reset(); (component = iter()) != NULL;) {
     if (index == position) {
       return component;
     }
     ++index;
   }
   return NULL;
 }
 const Component *ComponentList::search(const char *name) {
   PreserveIter pi(this);
   reset();
   for( Component *comp = NULL; ((comp = iter()) != NULL); ) {
     if( strcmp(comp->_name,name) == 0 ) return comp;
   }
   return NULL;
 }
 // Return number of USEs + number of DEFs
 // When there are no components, or the first component is a USE,
 // then we add '1' to hold a space for the 'result' operand.
 int ComponentList::num_operands() {
   PreserveIter pi(this);
   uint       count = 1;           // result operand
   uint       position = 0;
   Component *component  = NULL;
   for( reset(); (component = iter()) != NULL; ++position ) {
     if( component->isa(Component::USE) ||
         ( position == 0 && (! component->isa(Component::DEF))) ) {
       ++count;
     }
   }
   return count;
 }
 // Return zero-based position of operand 'name' in list;  -1 if not in list.
 // if parameter 'usedef' is ::USE, it will match USE, USE_DEF, ...
 int ComponentList::operand_position(const char *name, int usedef, Form *fm) {
   PreserveIter pi(this);
   int position = 0;
   int num_opnds = num_operands();
   Component *component;
   Component* preceding_non_use = NULL;
   Component* first_def = NULL;
   for (reset(); (component = iter()) != NULL; ++position) {
     // When the first component is not a DEF,
     // leave space for the result operand!
     if ( position==0 && (! component->isa(Component::DEF)) ) {
       ++position;
       ++num_opnds;
     }
     if (strcmp(name, component->_name)==0 && (component->isa(usedef))) {
       // When the first entry in the component list is a DEF and a USE
       // Treat them as being separate, a DEF first, then a USE
       if( position==0
           && usedef==Component::USE && component->isa(Component::DEF) ) {
         assert(position+1 < num_opnds, "advertised index in bounds");
         return position+1;
       } else {
         if( preceding_non_use && strcmp(component->_name, preceding_non_use->_name) ) {
           fprintf(stderr, "the name '%s(%s)' should not precede the name '%s(%s)'",
                   preceding_non_use->_name, preceding_non_use->getUsedefName(),
                   name, component->getUsedefName());
           if (fm && fm->is_instruction()) fprintf(stderr,  "in form '%s'", fm->is_instruction()->_ident);
           if (fm && fm->is_operand()) fprintf(stderr,  "in form '%s'", fm->is_operand()->_ident);
           fprintf(stderr,  "\n");
         }
         if( position >= num_opnds ) {
           fprintf(stderr, "the name '%s' is too late in its name list", name);
           if (fm && fm->is_instruction()) fprintf(stderr,  "in form '%s'", fm->is_instruction()->_ident);
           if (fm && fm->is_operand()) fprintf(stderr,  "in form '%s'", fm->is_operand()->_ident);
           fprintf(stderr,  "\n");
         }
         assert(position < num_opnds, "advertised index in bounds");
         return position;
       }
     }
     if( component->isa(Component::DEF)
         && component->isa(Component::USE) ) {
       ++position;
       if( position != 1 )  --position;   // only use two slots for the 1st USE_DEF
     }
     if( component->isa(Component::DEF) && !first_def ) {
       first_def = component;
     }
     if( !component->isa(Component::USE) && component != first_def ) {
       preceding_non_use = component;
     } else if( preceding_non_use && !strcmp(component->_name, preceding_non_use->_name) ) {
       preceding_non_use = NULL;
     }
   }
   return Not_in_list;
 }
 // Find position for this name, regardless of use/def information
 int ComponentList::operand_position(const char *name) {
   PreserveIter pi(this);
   int position = 0;
   Component *component;
   for (reset(); (component = iter()) != NULL; ++position) {
     // When the first component is not a DEF,
     // leave space for the result operand!
     if ( position==0 && (! component->isa(Component::DEF)) ) {
       ++position;
     }
     if (strcmp(name, component->_name)==0) {
       return position;
     }
     if( component->isa(Component::DEF)
         && component->isa(Component::USE) ) {
       ++position;
       if( position != 1 )  --position;   // only use two slots for the 1st USE_DEF
     }
   }
   return Not_in_list;
 }
 int ComponentList::operand_position_format(const char *name, Form *fm) {
   PreserveIter pi(this);
   int  first_position = operand_position(name);
   int  use_position   = operand_position(name, Component::USE, fm);
   return ((first_position < use_position) ? use_position : first_position);
 }
 int ComponentList::label_position() {
   PreserveIter pi(this);
   int position = 0;
   reset();
   for( Component *comp; (comp = iter()) != NULL; ++position) {
     // When the first component is not a DEF,
     // leave space for the result operand!
     if ( position==0 && (! comp->isa(Component::DEF)) ) {
       ++position;
     }
     if (strcmp(comp->_type, "label")==0) {
       return position;
     }
     if( comp->isa(Component::DEF)
         && comp->isa(Component::USE) ) {
       ++position;
       if( position != 1 )  --position;   // only use two slots for the 1st USE_DEF
     }
   }
   return -1;
 }
 int ComponentList::method_position() {
   PreserveIter pi(this);
   int position = 0;
   reset();
   for( Component *comp; (comp = iter()) != NULL; ++position) {
     // When the first component is not a DEF,
     // leave space for the result operand!
     if ( position==0 && (! comp->isa(Component::DEF)) ) {
       ++position;
     }
     if (strcmp(comp->_type, "method")==0) {
       return position;
     }
     if( comp->isa(Component::DEF)
         && comp->isa(Component::USE) ) {
       ++position;
       if( position != 1 )  --position;   // only use two slots for the 1st USE_DEF
     }
   }
   return -1;
 }
 void ComponentList::dump() { output(stderr); }
 void ComponentList::output(FILE *fp) {
   PreserveIter pi(this);
   fprintf(fp, "\n");
   Component *component;
   for (reset(); (component = iter()) != NULL;) {
     component->output(fp);
   }
   fprintf(fp, "\n");
 }
 //------------------------------MatchNode--------------------------------------
 MatchNode::MatchNode(ArchDesc &ad, const char *result, const char *mexpr,
                      const char *opType, MatchNode *lChild, MatchNode *rChild)
   : _AD(ad), _result(result), _name(mexpr), _opType(opType),
     _lChild(lChild), _rChild(rChild), _internalop(0), _numleaves(0),
     _commutative_id(0) {
   _numleaves = (lChild ? lChild->_numleaves : 0)
                + (rChild ? rChild->_numleaves : 0);
 }
 MatchNode::MatchNode(ArchDesc &ad, MatchNode& mnode)
   : _AD(ad), _result(mnode._result), _name(mnode._name),
     _opType(mnode._opType), _lChild(mnode._lChild), _rChild(mnode._rChild),
     _internalop(0), _numleaves(mnode._numleaves),
     _commutative_id(mnode._commutative_id) {
 }
 MatchNode::MatchNode(ArchDesc &ad, MatchNode& mnode, int clone)
   : _AD(ad), _result(mnode._result), _name(mnode._name),
     _opType(mnode._opType),
     _internalop(0), _numleaves(mnode._numleaves),
     _commutative_id(mnode._commutative_id) {
   if (mnode._lChild) {
     _lChild = new MatchNode(ad, *mnode._lChild, clone);
   } else {
     _lChild = NULL;
   }
   if (mnode._rChild) {
     _rChild = new MatchNode(ad, *mnode._rChild, clone);
   } else {
     _rChild = NULL;
   }
 }
 MatchNode::~MatchNode() {
   // // This node may not own its children if copied via assignment
   // if( _lChild ) delete _lChild;
   // if( _rChild ) delete _rChild;
 }
 bool  MatchNode::find_type(const char *type, int &position) const {
   if ( (_lChild != NULL) && (_lChild->find_type(type, position)) ) return true;
   if ( (_rChild != NULL) && (_rChild->find_type(type, position)) ) return true;
   if (strcmp(type,_opType)==0)  {
     return true;
   } else {
     ++position;
   }
   return false;
 }
 // Recursive call collecting info on top-level operands, not transitive.
 // Implementation does not modify state of internal structures.
 void MatchNode::append_components(FormDict& locals, ComponentList& components,
                                   bool def_flag) const {
   int usedef = def_flag ? Component::DEF : Component::USE;
   FormDict &globals = _AD.globalNames();
   assert (_name != NULL, "MatchNode::build_components encountered empty node\n");
   // Base case
   if (_lChild==NULL && _rChild==NULL) {
     // If _opType is not an operation, do not build a component for it #####
     const Form *f = globals[_opType];
     if( f != NULL ) {
       // Add non-ideals that are operands, operand-classes,
       if( ! f->ideal_only()
           && (f->is_opclass() || f->is_operand()) ) {
         components.insert(_name, _opType, usedef, true);
       }
     }
     return;
   }
   // Promote results of "Set" to DEF
   bool tmpdef_flag = (!strcmp(_opType, "Set")) ? true : false;
   if (_lChild) _lChild->append_components(locals, components, tmpdef_flag);
   tmpdef_flag = false;   // only applies to component immediately following 'Set'
   if (_rChild) _rChild->append_components(locals, components, tmpdef_flag);
 }
 // Find the n'th base-operand in the match node,
 // recursively investigates match rules of user-defined operands.
 //
 // Implementation does not modify state of internal structures since they
 // can be shared.
 bool MatchNode::base_operand(uint &position, FormDict &globals,
                              const char * &result, const char * &name,
                              const char * &opType) const {
   assert (_name != NULL, "MatchNode::base_operand encountered empty node\n");
   // Base case
   if (_lChild==NULL && _rChild==NULL) {
     // Check for special case: "Universe", "label"
     if (strcmp(_opType,"Universe") == 0 || strcmp(_opType,"label")==0 ) {
       if (position == 0) {
         result = _result;
         name   = _name;
         opType = _opType;
         return 1;
       } else {
         -- position;
         return 0;
       }
     }
     const Form *form = globals[_opType];
     MatchNode *matchNode = NULL;
     // Check for user-defined type
     if (form) {
       // User operand or instruction?
       OperandForm  *opForm = form->is_operand();
       InstructForm *inForm = form->is_instruction();
       if ( opForm ) {
         matchNode = (MatchNode*)opForm->_matrule;
       } else if ( inForm ) {
         matchNode = (MatchNode*)inForm->_matrule;
       }
     }
     // if this is user-defined, recurse on match rule
     // User-defined operand and instruction forms have a match-rule.
     if (matchNode) {
       return (matchNode->base_operand(position,globals,result,name,opType));
     } else {
       // Either not a form, or a system-defined form (no match rule).
       if (position==0) {
         result = _result;
         name   = _name;
         opType = _opType;
         return 1;
       } else {
         --position;
         return 0;
       }
     }
   } else {
     // Examine the left child and right child as well
     if (_lChild) {
       if (_lChild->base_operand(position, globals, result, name, opType))
         return 1;
     }
     if (_rChild) {
       if (_rChild->base_operand(position, globals, result, name, opType))
         return 1;
     }
   }
   return 0;
 }
 // Recursive call on all operands' match rules in my match rule.
 uint  MatchNode::num_consts(FormDict &globals) const {
   uint        index      = 0;
   uint        num_consts = 0;
   const char *result;
   const char *name;
   const char *opType;
   for (uint position = index;
        base_operand(position,globals,result,name,opType); position = index) {
     ++index;
     if( ideal_to_const_type(opType) )        num_consts++;
   }
   return num_consts;
 }
 // Recursive call on all operands' match rules in my match rule.
 // Constants in match rule subtree with specified type
 uint  MatchNode::num_consts(FormDict &globals, Form::DataType type) const {
   uint        index      = 0;
   uint        num_consts = 0;
   const char *result;
   const char *name;
   const char *opType;
   for (uint position = index;
        base_operand(position,globals,result,name,opType); position = index) {
     ++index;
     if( ideal_to_const_type(opType) == type ) num_consts++;
   }
   return num_consts;
 }
 // Recursive call on all operands' match rules in my match rule.
 uint  MatchNode::num_const_ptrs(FormDict &globals) const {
   return  num_consts( globals, Form::idealP );
 }
 bool  MatchNode::sets_result() const {
   return   ( (strcmp(_name,"Set") == 0) ? true : false );
 }
 const char *MatchNode::reduce_right(FormDict &globals) const {
   // If there is no right reduction, return NULL.
   const char      *rightStr    = NULL;
   // If we are a "Set", start from the right child.
   const MatchNode *const mnode = sets_result() ?
     (const MatchNode *)this->_rChild :
     (const MatchNode *)this;
   // If our right child exists, it is the right reduction
   if ( mnode->_rChild ) {
     rightStr = mnode->_rChild->_internalop ? mnode->_rChild->_internalop
       : mnode->_rChild->_opType;
   }
   // Else, May be simple chain rule: (Set dst operand_form), rightStr=NULL;
   return rightStr;
 }
 const char *MatchNode::reduce_left(FormDict &globals) const {
   // If there is no left reduction, return NULL.
   const char  *leftStr  = NULL;
   // If we are a "Set", start from the right child.
   const MatchNode *const mnode = sets_result() ?
     (const MatchNode *)this->_rChild :
     (const MatchNode *)this;
   // If our left child exists, it is the left reduction
   if ( mnode->_lChild ) {
     leftStr = mnode->_lChild->_internalop ? mnode->_lChild->_internalop
       : mnode->_lChild->_opType;
   } else {
     // May be simple chain rule: (Set dst operand_form_source)
     if ( sets_result() ) {
       OperandForm *oper = globals[mnode->_opType]->is_operand();
       if( oper ) {
         leftStr = mnode->_opType;
       }
     }
   }
   return leftStr;
 }
 //------------------------------count_instr_names------------------------------
 // Count occurrences of operands names in the leaves of the instruction
 // match rule.
 void MatchNode::count_instr_names( Dict &names ) {
   if( !this ) return;
   if( _lChild ) _lChild->count_instr_names(names);
   if( _rChild ) _rChild->count_instr_names(names);
   if( !_lChild && !_rChild ) {
     uintptr_t cnt = (uintptr_t)names[_name];
     cnt++;                      // One more name found
     names.Insert(_name,(void*)cnt);
   }
 }
 //------------------------------build_instr_pred-------------------------------
 // Build a path to 'name' in buf.  Actually only build if cnt is zero, so we
 // can skip some leading instances of 'name'.
 int MatchNode::build_instr_pred( char *buf, const char *name, int cnt ) {
   if( _lChild ) {
     if( !cnt ) strcpy( buf, "_kids[0]->" );
     cnt = _lChild->build_instr_pred( buf+strlen(buf), name, cnt );
     if( cnt < 0 ) return cnt;   // Found it, all done
   }
   if( _rChild ) {
     if( !cnt ) strcpy( buf, "_kids[1]->" );
     cnt = _rChild->build_instr_pred( buf+strlen(buf), name, cnt );
     if( cnt < 0 ) return cnt;   // Found it, all done
   }
   if( !_lChild && !_rChild ) {  // Found a leaf
     // Wrong name?  Give up...
     if( strcmp(name,_name) ) return cnt;
     if( !cnt ) strcpy(buf,"_leaf");
     return cnt-1;
   }
   return cnt;
 }
 //------------------------------build_internalop-------------------------------
 // Build string representation of subtree
 void MatchNode::build_internalop( ) {
   char *iop, *subtree;
   const char *lstr, *rstr;
   // Build string representation of subtree
   // Operation lchildType rchildType
   int len = (int)strlen(_opType) + 4;
   lstr = (_lChild) ? ((_lChild->_internalop) ?
                        _lChild->_internalop : _lChild->_opType) : "";
   rstr = (_rChild) ? ((_rChild->_internalop) ?
                        _rChild->_internalop : _rChild->_opType) : "";
   len += (int)strlen(lstr) + (int)strlen(rstr);
   subtree = (char *)malloc(len);
   sprintf(subtree,"_%s_%s_%s", _opType, lstr, rstr);
   // Hash the subtree string in _internalOps; if a name exists, use it
   iop = (char *)_AD._internalOps[subtree];
   // Else create a unique name, and add it to the hash table
   if (iop == NULL) {
     iop = subtree;
     _AD._internalOps.Insert(subtree, iop);
     _AD._internalOpNames.addName(iop);
     _AD._internalMatch.Insert(iop, this);
   }
   // Add the internal operand name to the MatchNode
   _internalop = iop;
   _result = iop;
 }
 void MatchNode::dump() {
   output(stderr);
 }
 void MatchNode::output(FILE *fp) {
   if (_lChild==0 && _rChild==0) {
     fprintf(fp," %s",_name);    // operand
   }
   else {
     fprintf(fp," (%s ",_name);  // " (opcodeName "
     if(_lChild) _lChild->output(fp); //               left operand
     if(_rChild) _rChild->output(fp); //                    right operand
     fprintf(fp,")");                 //                                 ")"
   }
 }
 int MatchNode::needs_ideal_memory_edge(FormDict &globals) const {
   static const char *needs_ideal_memory_list[] = {
     "StoreI","StoreL","StoreP","StoreN","StoreNKlass","StoreD","StoreF" ,
     "StoreB","StoreC","Store" ,"StoreFP",
     "LoadI", "LoadL", "LoadP" ,"LoadN", "LoadD" ,"LoadF"  ,
     "LoadB" , "LoadUB", "LoadUS" ,"LoadS" ,"Load" ,
     "StoreVector", "LoadVector",
     "LoadRange", "LoadKlass", "LoadNKlass", "LoadL_unaligned", "LoadD_unaligned",
     "LoadPLocked",
     "StorePConditional", "StoreIConditional", "StoreLConditional",
     "CompareAndSwapI", "CompareAndSwapL", "CompareAndSwapP", "CompareAndSwapN",
     "StoreCM",
     "ClearArray",
     "GetAndAddI", "GetAndSetI", "GetAndSetP",
     "GetAndAddL", "GetAndSetL", "GetAndSetN",
   };
   int cnt = sizeof(needs_ideal_memory_list)/sizeof(char*);
   if( strcmp(_opType,"PrefetchRead")==0 ||
       strcmp(_opType,"PrefetchWrite")==0 ||
       strcmp(_opType,"PrefetchAllocation")==0 )
     return 1;
   if( _lChild ) {
     const char *opType = _lChild->_opType;
     for( int i=0; i<cnt; i++ )
       if( strcmp(opType,needs_ideal_memory_list[i]) == 0 )
         return 1;
     if( _lChild->needs_ideal_memory_edge(globals) )
       return 1;
   }
   if( _rChild ) {
     const char *opType = _rChild->_opType;
     for( int i=0; i<cnt; i++ )
       if( strcmp(opType,needs_ideal_memory_list[i]) == 0 )
         return 1;
     if( _rChild->needs_ideal_memory_edge(globals) )
       return 1;
   }
   return 0;
 }
 // TRUE if defines a derived oop, and so needs a base oop edge present
 // post-matching.
 int MatchNode::needs_base_oop_edge() const {
   if( !strcmp(_opType,"AddP") ) return 1;
   if( strcmp(_opType,"Set") ) return 0;
   return !strcmp(_rChild->_opType,"AddP");
 }
 int InstructForm::needs_base_oop_edge(FormDict &globals) const {
   if( is_simple_chain_rule(globals) ) {
     const char *src = _matrule->_rChild->_opType;
     OperandForm *src_op = globals[src]->is_operand();
     assert( src_op, "Not operand class of chain rule" );
     return src_op->_matrule ? src_op->_matrule->needs_base_oop_edge() : 0;
   }                             // Else check instruction
   return _matrule ? _matrule->needs_base_oop_edge() : 0;
 }
 //-------------------------cisc spilling methods-------------------------------
 // helper routines and methods for detecting cisc-spilling instructions
 //-------------------------cisc_spill_merge------------------------------------
 int MatchNode::cisc_spill_merge(int left_spillable, int right_spillable) {
   int cisc_spillable  = Maybe_cisc_spillable;
   // Combine results of left and right checks
   if( (left_spillable == Maybe_cisc_spillable) && (right_spillable == Maybe_cisc_spillable) ) {
     // neither side is spillable, nor prevents cisc spilling
     cisc_spillable = Maybe_cisc_spillable;
   }
   else if( (left_spillable == Maybe_cisc_spillable) && (right_spillable > Maybe_cisc_spillable) ) {
     // right side is spillable
     cisc_spillable = right_spillable;
   }
   else if( (right_spillable == Maybe_cisc_spillable) && (left_spillable > Maybe_cisc_spillable) ) {
     // left side is spillable
     cisc_spillable = left_spillable;
   }
   else if( (left_spillable == Not_cisc_spillable) || (right_spillable == Not_cisc_spillable) ) {
     // left or right prevents cisc spilling this instruction
     cisc_spillable = Not_cisc_spillable;
   }
   else {
     // Only allow one to spill
     cisc_spillable = Not_cisc_spillable;
   }
   return cisc_spillable;
 }
 //-------------------------root_ops_match--------------------------------------
 bool static root_ops_match(FormDict &globals, const char *op1, const char *op2) {
   // Base Case: check that the current operands/operations match
   assert( op1, "Must have op's name");
   assert( op2, "Must have op's name");
   const Form *form1 = globals[op1];
   const Form *form2 = globals[op2];
   return (form1 == form2);
 }
 //-------------------------cisc_spill_match_node-------------------------------
 // Recursively check two MatchRules for legal conversion via cisc-spilling
 int MatchNode::cisc_spill_match(FormDict& globals, RegisterForm* registers, MatchNode* mRule2, const char* &operand, const char* &reg_type) {
   int cisc_spillable  = Maybe_cisc_spillable;
   int left_spillable  = Maybe_cisc_spillable;
   int right_spillable = Maybe_cisc_spillable;
   // Check that each has same number of operands at this level
   if( (_lChild && !(mRule2->_lChild)) || (_rChild && !(mRule2->_rChild)) )
     return Not_cisc_spillable;
   // Base Case: check that the current operands/operations match
   // or are CISC spillable
   assert( _opType, "Must have _opType");
   assert( mRule2->_opType, "Must have _opType");
   const Form *form  = globals[_opType];
   const Form *form2 = globals[mRule2->_opType];
   if( form == form2 ) {
     cisc_spillable = Maybe_cisc_spillable;
   } else {
     const InstructForm *form2_inst = form2 ? form2->is_instruction() : NULL;
     const char *name_left  = mRule2->_lChild ? mRule2->_lChild->_opType : NULL;
     const char *name_right = mRule2->_rChild ? mRule2->_rChild->_opType : NULL;
     DataType data_type = Form::none;
     if (form->is_operand()) {
       // Make sure the loadX matches the type of the reg
       data_type = form->ideal_to_Reg_type(form->is_operand()->ideal_type(globals));
     }
     // Detect reg vs (loadX memory)
     if( form->is_cisc_reg(globals)
         && form2_inst
         && data_type != Form::none
         && (is_load_from_memory(mRule2->_opType) == data_type) // reg vs. (load memory)
         && (name_left != NULL)       // NOT (load)
         && (name_right == NULL) ) {  // NOT (load memory foo)
       const Form *form2_left = name_left ? globals[name_left] : NULL;
       if( form2_left && form2_left->is_cisc_mem(globals) ) {
         cisc_spillable = Is_cisc_spillable;
         operand        = _name;
         reg_type       = _result;
         return Is_cisc_spillable;
       } else {
         cisc_spillable = Not_cisc_spillable;
       }
     }
     // Detect reg vs memory
     else if( form->is_cisc_reg(globals) && form2->is_cisc_mem(globals) ) {
       cisc_spillable = Is_cisc_spillable;
       operand        = _name;
       reg_type       = _result;
       return Is_cisc_spillable;
     } else {
       cisc_spillable = Not_cisc_spillable;
     }
   }
   // If cisc is still possible, check rest of tree
   if( cisc_spillable == Maybe_cisc_spillable ) {
     // Check that each has same number of operands at this level
     if( (_lChild && !(mRule2->_lChild)) || (_rChild && !(mRule2->_rChild)) ) return Not_cisc_spillable;
     // Check left operands
     if( (_lChild == NULL) && (mRule2->_lChild == NULL) ) {
       left_spillable = Maybe_cisc_spillable;
     } else {
       left_spillable = _lChild->cisc_spill_match(globals, registers, mRule2->_lChild, operand, reg_type);
     }
     // Check right operands
     if( (_rChild == NULL) && (mRule2->_rChild == NULL) ) {
       right_spillable =  Maybe_cisc_spillable;
     } else {
       right_spillable = _rChild->cisc_spill_match(globals, registers, mRule2->_rChild, operand, reg_type);
     }
     // Combine results of left and right checks
     cisc_spillable = cisc_spill_merge(left_spillable, right_spillable);
   }
   return cisc_spillable;
 }
 //---------------------------cisc_spill_match_rule------------------------------
 // Recursively check two MatchRules for legal conversion via cisc-spilling
 // This method handles the root of Match tree,
 // general recursive checks done in MatchNode
 int  MatchRule::matchrule_cisc_spill_match(FormDict& globals, RegisterForm* registers,
                                            MatchRule* mRule2, const char* &operand,
                                            const char* &reg_type) {
   int cisc_spillable  = Maybe_cisc_spillable;
   int left_spillable  = Maybe_cisc_spillable;
   int right_spillable = Maybe_cisc_spillable;
   // Check that each sets a result
   if( !(sets_result() && mRule2->sets_result()) ) return Not_cisc_spillable;
   // Check that each has same number of operands at this level
   if( (_lChild && !(mRule2->_lChild)) || (_rChild && !(mRule2->_rChild)) ) return Not_cisc_spillable;
   // Check left operands: at root, must be target of 'Set'
   if( (_lChild == NULL) || (mRule2->_lChild == NULL) ) {
     left_spillable = Not_cisc_spillable;
   } else {
     // Do not support cisc-spilling instruction's target location
     if( root_ops_match(globals, _lChild->_opType, mRule2->_lChild->_opType) ) {
       left_spillable = Maybe_cisc_spillable;
     } else {
       left_spillable = Not_cisc_spillable;
     }
   }
   // Check right operands: recursive walk to identify reg->mem operand
   if( (_rChild == NULL) && (mRule2->_rChild == NULL) ) {
     right_spillable =  Maybe_cisc_spillable;
   } else {
     right_spillable = _rChild->cisc_spill_match(globals, registers, mRule2->_rChild, operand, reg_type);
   }
   // Combine results of left and right checks
   cisc_spillable = cisc_spill_merge(left_spillable, right_spillable);
   return cisc_spillable;
 }
 //----------------------------- equivalent ------------------------------------
 // Recursively check to see if two match rules are equivalent.
 // This rule handles the root.
 bool MatchRule::equivalent(FormDict &globals, MatchNode *mRule2) {
   // Check that each sets a result
   if (sets_result() != mRule2->sets_result()) {
     return false;
   }
   // Check that the current operands/operations match
   assert( _opType, "Must have _opType");
   assert( mRule2->_opType, "Must have _opType");
   const Form *form  = globals[_opType];
   const Form *form2 = globals[mRule2->_opType];
   if( form != form2 ) {
     return false;
   }
   if (_lChild ) {
     if( !_lChild->equivalent(globals, mRule2->_lChild) )
       return false;
   } else if (mRule2->_lChild) {
     return false; // I have NULL left child, mRule2 has non-NULL left child.
   }
   if (_rChild ) {
     if( !_rChild->equivalent(globals, mRule2->_rChild) )
       return false;
   } else if (mRule2->_rChild) {
     return false; // I have NULL right child, mRule2 has non-NULL right child.
   }
   // We've made it through the gauntlet.
   return true;
 }
 //----------------------------- equivalent ------------------------------------
 // Recursively check to see if two match rules are equivalent.
 // This rule handles the operands.
 bool MatchNode::equivalent(FormDict &globals, MatchNode *mNode2) {
   if( !mNode2 )
     return false;
   // Check that the current operands/operations match
   assert( _opType, "Must have _opType");
   assert( mNode2->_opType, "Must have _opType");
   const Form *form  = globals[_opType];
   const Form *form2 = globals[mNode2->_opType];
   if( form != form2 ) {
     return false;
   }
   // Check that their children also match
   if (_lChild ) {
     if( !_lChild->equivalent(globals, mNode2->_lChild) )
       return false;
   } else if (mNode2->_lChild) {
     return false; // I have NULL left child, mNode2 has non-NULL left child.
   }
   if (_rChild ) {
     if( !_rChild->equivalent(globals, mNode2->_rChild) )
       return false;
   } else if (mNode2->_rChild) {
     return false; // I have NULL right child, mNode2 has non-NULL right child.
   }
   // We've made it through the gauntlet.
   return true;
 }
 //-------------------------- has_commutative_op -------------------------------
 // Recursively check for commutative operations with subtree operands
 // which could be swapped.
 void MatchNode::count_commutative_op(int& count) {
   static const char *commut_op_list[] = {
     "AddI","AddL","AddF","AddD",
     "AndI","AndL",
     "MaxI","MinI",
     "MulI","MulL","MulF","MulD",
     "OrI" ,"OrL" ,
     "XorI","XorL"
   };
   int cnt = sizeof(commut_op_list)/sizeof(char*);
   if( _lChild && _rChild && (_lChild->_lChild || _rChild->_lChild) ) {
     // Don't swap if right operand is an immediate constant.
     bool is_const = false;
     if( _rChild->_lChild == NULL && _rChild->_rChild == NULL ) {
       FormDict &globals = _AD.globalNames();
       const Form *form = globals[_rChild->_opType];
       if ( form ) {
         OperandForm  *oper = form->is_operand();
         if( oper && oper->interface_type(globals) == Form::constant_interface )
           is_const = true;
       }
     }
     if( !is_const ) {
       for( int i=0; i<cnt; i++ ) {
         if( strcmp(_opType, commut_op_list[i]) == 0 ) {
           count++;
           _commutative_id = count; // id should be > 0
           break;
         }
       }
     }
   }
   if( _lChild )
     _lChild->count_commutative_op(count);
   if( _rChild )
     _rChild->count_commutative_op(count);
 }
 //-------------------------- swap_commutative_op ------------------------------
 // Recursively swap specified commutative operation with subtree operands.
 void MatchNode::swap_commutative_op(bool atroot, int id) {
   if( _commutative_id == id ) { // id should be > 0
     assert(_lChild && _rChild && (_lChild->_lChild || _rChild->_lChild ),
             "not swappable operation");
     MatchNode* tmp = _lChild;
     _lChild = _rChild;
     _rChild = tmp;
     // Don't exit here since we need to build internalop.
   }
   bool is_set = ( strcmp(_opType, "Set") == 0 );
   if( _lChild )
     _lChild->swap_commutative_op(is_set, id);
   if( _rChild )
     _rChild->swap_commutative_op(is_set, id);
   // If not the root, reduce this subtree to an internal operand
   if( !atroot && (_lChild || _rChild) ) {
     build_internalop();
   }
 }
 //-------------------------- swap_commutative_op ------------------------------
 // Recursively swap specified commutative operation with subtree operands.
 void MatchRule::matchrule_swap_commutative_op(const char* instr_ident, int count, int& match_rules_cnt) {
   assert(match_rules_cnt < 100," too many match rule clones");
   // Clone
   MatchRule* clone = new MatchRule(_AD, this);
   // Swap operands of commutative operation
   ((MatchNode*)clone)->swap_commutative_op(true, count);
   char* buf = (char*) malloc(strlen(instr_ident) + 4);
   sprintf(buf, "%s_%d", instr_ident, match_rules_cnt++);
   clone->_result = buf;
   clone->_next = this->_next;
   this-> _next = clone;
   if( (--count) > 0 ) {
     this-> matchrule_swap_commutative_op(instr_ident, count, match_rules_cnt);
     clone->matchrule_swap_commutative_op(instr_ident, count, match_rules_cnt);
   }
 }
 //------------------------------MatchRule--------------------------------------
 MatchRule::MatchRule(ArchDesc &ad)
   : MatchNode(ad), _depth(0), _construct(NULL), _numchilds(0) {
     _next = NULL;
 }
 MatchRule::MatchRule(ArchDesc &ad, MatchRule* mRule)
   : MatchNode(ad, *mRule, 0), _depth(mRule->_depth),
     _construct(mRule->_construct), _numchilds(mRule->_numchilds) {
     _next = NULL;
 }
 MatchRule::MatchRule(ArchDesc &ad, MatchNode* mroot, int depth, char *cnstr,
                      int numleaves)
   : MatchNode(ad,*mroot), _depth(depth), _construct(cnstr),
     _numchilds(0) {
       _next = NULL;
       mroot->_lChild = NULL;
       mroot->_rChild = NULL;
       delete mroot;
       _numleaves = numleaves;
       _numchilds = (_lChild ? 1 : 0) + (_rChild ? 1 : 0);
 }
 MatchRule::~MatchRule() {
 }
 // Recursive call collecting info on top-level operands, not transitive.
 // Implementation does not modify state of internal structures.
 void MatchRule::append_components(FormDict& locals, ComponentList& components, bool def_flag) const {
   assert (_name != NULL, "MatchNode::build_components encountered empty node\n");
   MatchNode::append_components(locals, components,
                                false /* not necessarily a def */);
 }
 // Recursive call on all operands' match rules in my match rule.
 // Implementation does not modify state of internal structures  since they
 // can be shared.
 // The MatchNode that is called first treats its
 bool MatchRule::base_operand(uint &position0, FormDict &globals,
                              const char *&result, const char * &name,
                              const char * &opType)const{
   uint position = position0;
   return (MatchNode::base_operand( position, globals, result, name, opType));
 }
 bool MatchRule::is_base_register(FormDict &globals) const {
   uint   position = 1;
   const char  *result   = NULL;
   const char  *name     = NULL;
   const char  *opType   = NULL;
   if (!base_operand(position, globals, result, name, opType)) {
     position = 0;
     if( base_operand(position, globals, result, name, opType) &&
         (strcmp(opType,"RegI")==0 ||
          strcmp(opType,"RegP")==0 ||
          strcmp(opType,"RegN")==0 ||
          strcmp(opType,"RegL")==0 ||
          strcmp(opType,"RegF")==0 ||
          strcmp(opType,"RegD")==0 ||
          strcmp(opType,"VecS")==0 ||
          strcmp(opType,"VecD")==0 ||
          strcmp(opType,"VecX")==0 ||
          strcmp(opType,"VecY")==0 ||
          strcmp(opType,"Reg" )==0) ) {
       return 1;
     }
   }
   return 0;
 }
 Form::DataType MatchRule::is_base_constant(FormDict &globals) const {
   uint         position = 1;
   const char  *result   = NULL;
   const char  *name     = NULL;
   const char  *opType   = NULL;
   if (!base_operand(position, globals, result, name, opType)) {
     position = 0;
     if (base_operand(position, globals, result, name, opType)) {
       return ideal_to_const_type(opType);
     }
   }
   return Form::none;
 }
 bool MatchRule::is_chain_rule(FormDict &globals) const {
   // Check for chain rule, and do not generate a match list for it
   if ((_lChild == NULL) && (_rChild == NULL) ) {
     const Form *form = globals[_opType];
     // If this is ideal, then it is a base match, not a chain rule.
     if ( form && form->is_operand() && (!form->ideal_only())) {
       return true;
     }
   }
   // Check for "Set" form of chain rule, and do not generate a match list
   if (_rChild) {
     const char *rch = _rChild->_opType;
     const Form *form = globals[rch];
     if ((!strcmp(_opType,"Set") &&
          ((form) && form->is_operand()))) {
       return true;
     }
   }
   return false;
 }
 int MatchRule::is_ideal_copy() const {
   if( _rChild ) {
     const char  *opType = _rChild->_opType;
 #if 1
     if( strcmp(opType,"CastIP")==0 )
       return 1;
 #else
     if( strcmp(opType,"CastII")==0 )
       return 1;
     // Do not treat *CastPP this way, because it
     // may transfer a raw pointer to an oop.
     // If the register allocator were to coalesce this
     // into a single LRG, the GC maps would be incorrect.
     //if( strcmp(opType,"CastPP")==0 )
     //  return 1;
     //if( strcmp(opType,"CheckCastPP")==0 )
     //  return 1;
     //
     // Do not treat CastX2P or CastP2X this way, because
     // raw pointers and int types are treated differently
     // when saving local & stack info for safepoints in
     // Output().
     //if( strcmp(opType,"CastX2P")==0 )
     //  return 1;
     //if( strcmp(opType,"CastP2X")==0 )
     //  return 1;
 #endif
   }
   if( is_chain_rule(_AD.globalNames()) &&
       _lChild && strncmp(_lChild->_opType,"stackSlot",9)==0 )
     return 1;
   return 0;
 }
 int MatchRule::is_expensive() const {
   if( _rChild ) {
     const char  *opType = _rChild->_opType;
     if( strcmp(opType,"AtanD")==0 ||
         strcmp(opType,"CosD")==0 ||
         strcmp(opType,"DivD")==0 ||
         strcmp(opType,"DivF")==0 ||
         strcmp(opType,"DivI")==0 ||
         strcmp(opType,"ExpD")==0 ||
         strcmp(opType,"LogD")==0 ||
         strcmp(opType,"Log10D")==0 ||
         strcmp(opType,"ModD")==0 ||
         strcmp(opType,"ModF")==0 ||
         strcmp(opType,"ModI")==0 ||
         strcmp(opType,"PowD")==0 ||
         strcmp(opType,"SinD")==0 ||
         strcmp(opType,"SqrtD")==0 ||
         strcmp(opType,"TanD")==0 ||
         strcmp(opType,"ConvD2F")==0 ||
         strcmp(opType,"ConvD2I")==0 ||
         strcmp(opType,"ConvD2L")==0 ||
         strcmp(opType,"ConvF2D")==0 ||
         strcmp(opType,"ConvF2I")==0 ||
         strcmp(opType,"ConvF2L")==0 ||
         strcmp(opType,"ConvI2D")==0 ||
         strcmp(opType,"ConvI2F")==0 ||
         strcmp(opType,"ConvI2L")==0 ||
         strcmp(opType,"ConvL2D")==0 ||
         strcmp(opType,"ConvL2F")==0 ||
         strcmp(opType,"ConvL2I")==0 ||
         strcmp(opType,"DecodeN")==0 ||
         strcmp(opType,"EncodeP")==0 ||
         strcmp(opType,"EncodePKlass")==0 ||
         strcmp(opType,"DecodeNKlass")==0 ||
         strcmp(opType,"RoundDouble")==0 ||
         strcmp(opType,"RoundFloat")==0 ||
         strcmp(opType,"ReverseBytesI")==0 ||
         strcmp(opType,"ReverseBytesL")==0 ||
         strcmp(opType,"ReverseBytesUS")==0 ||
         strcmp(opType,"ReverseBytesS")==0 ||
         strcmp(opType,"ReplicateB")==0 ||
         strcmp(opType,"ReplicateS")==0 ||
         strcmp(opType,"ReplicateI")==0 ||
         strcmp(opType,"ReplicateL")==0 ||
         strcmp(opType,"ReplicateF")==0 ||
         strcmp(opType,"ReplicateD")==0 ||
 /* 0 to line up columns nicely */ )
       return 1;
   }
   return 0;
 }
 bool MatchRule::is_ideal_if() const {
   if( !_opType ) return false;
   return
     !strcmp(_opType,"If"            ) ||
     !strcmp(_opType,"CountedLoopEnd");
 }
 bool MatchRule::is_ideal_fastlock() const {
   if ( _opType && (strcmp(_opType,"Set") == 0) && _rChild ) {
     return (strcmp(_rChild->_opType,"FastLock") == 0);
   }
   return false;
 }
 bool MatchRule::is_ideal_membar() const {
   if( !_opType ) return false;
   return
     !strcmp(_opType,"MemBarAcquire"  ) ||
     !strcmp(_opType,"MemBarRelease"  ) ||
     !strcmp(_opType,"MemBarAcquireLock") ||
     !strcmp(_opType,"MemBarReleaseLock") ||
     !strcmp(_opType,"MemBarVolatile" ) ||
     !strcmp(_opType,"MemBarCPUOrder" ) ||
     !strcmp(_opType,"MemBarStoreStore" );
 }
 bool MatchRule::is_ideal_loadPC() const {
   if ( _opType && (strcmp(_opType,"Set") == 0) && _rChild ) {
     return (strcmp(_rChild->_opType,"LoadPC") == 0);
   }
   return false;
 }
 bool MatchRule::is_ideal_box() const {
   if ( _opType && (strcmp(_opType,"Set") == 0) && _rChild ) {
     return (strcmp(_rChild->_opType,"Box") == 0);
   }
   return false;
 }
 bool MatchRule::is_ideal_goto() const {
   bool   ideal_goto = false;
   if( _opType && (strcmp(_opType,"Goto") == 0) ) {
     ideal_goto = true;
   }
   return ideal_goto;
 }
 bool MatchRule::is_ideal_jump() const {
   if( _opType ) {
     if( !strcmp(_opType,"Jump") )
       return true;
   }
   return false;
 }
 bool MatchRule::is_ideal_bool() const {
   if( _opType ) {
     if( !strcmp(_opType,"Bool") )
       return true;
   }
   return false;
 }
 Form::DataType MatchRule::is_ideal_load() const {
   Form::DataType ideal_load = Form::none;
   if ( _opType && (strcmp(_opType,"Set") == 0) && _rChild ) {
     const char *opType = _rChild->_opType;
     ideal_load = is_load_from_memory(opType);
   }
   return ideal_load;
 }
 bool MatchRule::is_vector() const {
   static const char *vector_list[] = {
     "AddVB","AddVS","AddVI","AddVL","AddVF","AddVD",
     "SubVB","SubVS","SubVI","SubVL","SubVF","SubVD",
     "MulVS","MulVI","MulVF","MulVD",
     "DivVF","DivVD",
     "AndV" ,"XorV" ,"OrV",
     "LShiftCntV","RShiftCntV",
     "LShiftVB","LShiftVS","LShiftVI","LShiftVL",
     "RShiftVB","RShiftVS","RShiftVI","RShiftVL",
     "URShiftVB","URShiftVS","URShiftVI","URShiftVL",
     "ReplicateB","ReplicateS","ReplicateI","ReplicateL","ReplicateF","ReplicateD",
     "LoadVector","StoreVector",
     // Next are not supported currently.
     "PackB","PackS","PackI","PackL","PackF","PackD","Pack2L","Pack2D",
     "ExtractB","ExtractUB","ExtractC","ExtractS","ExtractI","ExtractL","ExtractF","ExtractD"
   };
   int cnt = sizeof(vector_list)/sizeof(char*);
   if (_rChild) {
     const char  *opType = _rChild->_opType;
     for (int i=0; i<cnt; i++)
       if (strcmp(opType,vector_list[i]) == 0)
         return true;
   }
   return false;
 }
 bool MatchRule::skip_antidep_check() const {
   // Some loads operate on what is effectively immutable memory so we
   // should skip the anti dep computations.  For some of these nodes
   // the rewritable field keeps the anti dep logic from triggering but
   // for certain kinds of LoadKlass it does not since they are
   // actually reading memory which could be rewritten by the runtime,
   // though never by generated code.  This disables it uniformly for
   // the nodes that behave like this: LoadKlass, LoadNKlass and
   // LoadRange.
   if ( _opType && (strcmp(_opType,"Set") == 0) && _rChild ) {
     const char *opType = _rChild->_opType;
     if (strcmp("LoadKlass", opType) == 0 ||
         strcmp("LoadNKlass", opType) == 0 ||
         strcmp("LoadRange", opType) == 0) {
       return true;
     }
   }
   return false;
 }
 Form::DataType MatchRule::is_ideal_store() const {
   Form::DataType ideal_store = Form::none;
   if ( _opType && (strcmp(_opType,"Set") == 0) && _rChild ) {
     const char *opType = _rChild->_opType;
     ideal_store = is_store_to_memory(opType);
   }
   return ideal_store;
 }
 void MatchRule::dump() {
   output(stderr);
 }
 // Write just one line.
 void MatchRule::output_short(FILE *fp) {
   fprintf(fp,"MatchRule: ( %s",_name);
   if (_lChild) _lChild->output(fp);
   if (_rChild) _rChild->output(fp);
   fprintf(fp," )");
 }
 void MatchRule::output(FILE *fp) {
   output_short(fp);
   fprintf(fp,"\n   nesting depth = %d\n", _depth);
   if (_result) fprintf(fp,"   Result Type = %s", _result);
   fprintf(fp,"\n");
 }
 //------------------------------Attribute--------------------------------------
 Attribute::Attribute(char *id, char* val, int type)
   : _ident(id), _val(val), _atype(type) {
 }
 Attribute::~Attribute() {
 }
 int Attribute::int_val(ArchDesc &ad) {
   // Make sure it is an integer constant:
   int result = 0;
   if (!_val || !ADLParser::is_int_token(_val, result)) {
     ad.syntax_err(0, "Attribute %s must have an integer value: %s",
                   _ident, _val ? _val : "");
   }
   return result;
 }
 void Attribute::dump() {
   output(stderr);
 } // Debug printer
 // Write to output files
 void Attribute::output(FILE *fp) {
   fprintf(fp,"Attribute: %s  %s\n", (_ident?_ident:""), (_val?_val:""));
 }
 //------------------------------FormatRule----------------------------------
 FormatRule::FormatRule(char *temp)
   : _temp(temp) {
 }
 FormatRule::~FormatRule() {
 }
 void FormatRule::dump() {
   output(stderr);
 }
 // Write to output files
 void FormatRule::output(FILE *fp) {
   fprintf(fp,"\nFormat Rule: \n%s", (_temp?_temp:""));
   fprintf(fp,"\n");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/adlc/formssel.cpp@7fa25f5575c9 (annotated)

src/share/vm/adlc/formssel.cpp