jdk8-mips64-public/hotspot: src/share/vm/c1/c1_LIRGenerator.cpp@0fbdb4381b99 (annotated)

src/share/vm/c1/c1_LIRGenerator.cpp@0fbdb4381b99 (annotated)

src/share/vm/c1/c1_LIRGenerator.cpp

Mon, 09 Mar 2009 13:28:46 -0700

author: xdono
date: Mon, 09 Mar 2009 13:28:46 -0700
changeset 1014: 0fbdb4381b99
parent 921: a738a625039a
child 1215: c96bf21b756f
permissions: -rw-r--r--

6814575: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair

 /*
  * Copyright 2005-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_c1_LIRGenerator.cpp.incl"
 #ifdef ASSERT
 #define __ gen()->lir(__FILE__, __LINE__)->
 #else
 #define __ gen()->lir()->
 #endif
 void PhiResolverState::reset(int max_vregs) {
   // Initialize array sizes
   _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL);
   _virtual_operands.trunc_to(0);
   _other_operands.at_put_grow(max_vregs - 1, NULL, NULL);
   _other_operands.trunc_to(0);
   _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL);
   _vreg_table.trunc_to(0);
 }
 //--------------------------------------------------------------
 // PhiResolver
 // Resolves cycles:
 //
 //  r1 := r2  becomes  temp := r1
 //  r2 := r1           r1 := r2
 //                     r2 := temp
 // and orders moves:
 //
 //  r2 := r3  becomes  r1 := r2
 //  r1 := r2           r2 := r3
 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs)
  : _gen(gen)
  , _state(gen->resolver_state())
  , _temp(LIR_OprFact::illegalOpr)
 {
   // reinitialize the shared state arrays
   _state.reset(max_vregs);
 }
 void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) {
   assert(src->is_valid(), "");
   assert(dest->is_valid(), "");
   __ move(src, dest);
 }
 void PhiResolver::move_temp_to(LIR_Opr dest) {
   assert(_temp->is_valid(), "");
   emit_move(_temp, dest);
   NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr);
 }
 void PhiResolver::move_to_temp(LIR_Opr src) {
   assert(_temp->is_illegal(), "");
   _temp = _gen->new_register(src->type());
   emit_move(src, _temp);
 }
 // Traverse assignment graph in depth first order and generate moves in post order
 // ie. two assignments: b := c, a := b start with node c:
 // Call graph: move(NULL, c) -> move(c, b) -> move(b, a)
 // Generates moves in this order: move b to a and move c to b
 // ie. cycle a := b, b := a start with node a
 // Call graph: move(NULL, a) -> move(a, b) -> move(b, a)
 // Generates moves in this order: move b to temp, move a to b, move temp to a
 void PhiResolver::move(ResolveNode* src, ResolveNode* dest) {
   if (!dest->visited()) {
     dest->set_visited();
     for (int i = dest->no_of_destinations()-1; i >= 0; i --) {
       move(dest, dest->destination_at(i));
     }
   } else if (!dest->start_node()) {
     // cylce in graph detected
     assert(_loop == NULL, "only one loop valid!");
     _loop = dest;
     move_to_temp(src->operand());
     return;
   } // else dest is a start node
   if (!dest->assigned()) {
     if (_loop == dest) {
       move_temp_to(dest->operand());
       dest->set_assigned();
     } else if (src != NULL) {
       emit_move(src->operand(), dest->operand());
       dest->set_assigned();
     }
   }
 }
 PhiResolver::~PhiResolver() {
   int i;
   // resolve any cycles in moves from and to virtual registers
   for (i = virtual_operands().length() - 1; i >= 0; i --) {
     ResolveNode* node = virtual_operands()[i];
     if (!node->visited()) {
       _loop = NULL;
       move(NULL, node);
       node->set_start_node();
       assert(_temp->is_illegal(), "move_temp_to() call missing");
     }
   }
   // generate move for move from non virtual register to abitrary destination
   for (i = other_operands().length() - 1; i >= 0; i --) {
     ResolveNode* node = other_operands()[i];
     for (int j = node->no_of_destinations() - 1; j >= 0; j --) {
       emit_move(node->operand(), node->destination_at(j)->operand());
     }
   }
 }
 ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) {
   ResolveNode* node;
   if (opr->is_virtual()) {
     int vreg_num = opr->vreg_number();
     node = vreg_table().at_grow(vreg_num, NULL);
     assert(node == NULL || node->operand() == opr, "");
     if (node == NULL) {
       node = new ResolveNode(opr);
       vreg_table()[vreg_num] = node;
     }
     // Make sure that all virtual operands show up in the list when
     // they are used as the source of a move.
     if (source && !virtual_operands().contains(node)) {
       virtual_operands().append(node);
     }
   } else {
     assert(source, "");
     node = new ResolveNode(opr);
     other_operands().append(node);
   }
   return node;
 }
 void PhiResolver::move(LIR_Opr src, LIR_Opr dest) {
   assert(dest->is_virtual(), "");
   // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr();
   assert(src->is_valid(), "");
   assert(dest->is_valid(), "");
   ResolveNode* source = source_node(src);
   source->append(destination_node(dest));
 }
 //--------------------------------------------------------------
 // LIRItem
 void LIRItem::set_result(LIR_Opr opr) {
   assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change");
   value()->set_operand(opr);
   if (opr->is_virtual()) {
     _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL);
   }
   _result = opr;
 }
 void LIRItem::load_item() {
   if (result()->is_illegal()) {
     // update the items result
     _result = value()->operand();
   }
   if (!result()->is_register()) {
     LIR_Opr reg = _gen->new_register(value()->type());
     __ move(result(), reg);
     if (result()->is_constant()) {
       _result = reg;
     } else {
       set_result(reg);
     }
   }
 }
 void LIRItem::load_for_store(BasicType type) {
   if (_gen->can_store_as_constant(value(), type)) {
     _result = value()->operand();
     if (!_result->is_constant()) {
       _result = LIR_OprFact::value_type(value()->type());
     }
   } else if (type == T_BYTE || type == T_BOOLEAN) {
     load_byte_item();
   } else {
     load_item();
   }
 }
 void LIRItem::load_item_force(LIR_Opr reg) {
   LIR_Opr r = result();
   if (r != reg) {
     if (r->type() != reg->type()) {
       // moves between different types need an intervening spill slot
       LIR_Opr tmp = _gen->force_to_spill(r, reg->type());
       __ move(tmp, reg);
     } else {
       __ move(r, reg);
     }
     _result = reg;
   }
 }
 ciObject* LIRItem::get_jobject_constant() const {
   ObjectType* oc = type()->as_ObjectType();
   if (oc) {
     return oc->constant_value();
   }
   return NULL;
 }
 jint LIRItem::get_jint_constant() const {
   assert(is_constant() && value() != NULL, "");
   assert(type()->as_IntConstant() != NULL, "type check");
   return type()->as_IntConstant()->value();
 }
 jint LIRItem::get_address_constant() const {
   assert(is_constant() && value() != NULL, "");
   assert(type()->as_AddressConstant() != NULL, "type check");
   return type()->as_AddressConstant()->value();
 }
 jfloat LIRItem::get_jfloat_constant() const {
   assert(is_constant() && value() != NULL, "");
   assert(type()->as_FloatConstant() != NULL, "type check");
   return type()->as_FloatConstant()->value();
 }
 jdouble LIRItem::get_jdouble_constant() const {
   assert(is_constant() && value() != NULL, "");
   assert(type()->as_DoubleConstant() != NULL, "type check");
   return type()->as_DoubleConstant()->value();
 }
 jlong LIRItem::get_jlong_constant() const {
   assert(is_constant() && value() != NULL, "");
   assert(type()->as_LongConstant() != NULL, "type check");
   return type()->as_LongConstant()->value();
 }
 //--------------------------------------------------------------
 void LIRGenerator::init() {
   _bs = Universe::heap()->barrier_set();
 }
 void LIRGenerator::block_do_prolog(BlockBegin* block) {
 #ifndef PRODUCT
   if (PrintIRWithLIR) {
     block->print();
   }
 #endif
   // set up the list of LIR instructions
   assert(block->lir() == NULL, "LIR list already computed for this block");
   _lir = new LIR_List(compilation(), block);
   block->set_lir(_lir);
   __ branch_destination(block->label());
   if (LIRTraceExecution &&
       Compilation::current_compilation()->hir()->start()->block_id() != block->block_id() &&
       !block->is_set(BlockBegin::exception_entry_flag)) {
     assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst");
     trace_block_entry(block);
   }
 }
 void LIRGenerator::block_do_epilog(BlockBegin* block) {
 #ifndef PRODUCT
   if (PrintIRWithLIR) {
     tty->cr();
   }
 #endif
   // LIR_Opr for unpinned constants shouldn't be referenced by other
   // blocks so clear them out after processing the block.
   for (int i = 0; i < _unpinned_constants.length(); i++) {
     _unpinned_constants.at(i)->clear_operand();
   }
   _unpinned_constants.trunc_to(0);
   // clear our any registers for other local constants
   _constants.trunc_to(0);
   _reg_for_constants.trunc_to(0);
 }
 void LIRGenerator::block_do(BlockBegin* block) {
   CHECK_BAILOUT();
   block_do_prolog(block);
   set_block(block);
   for (Instruction* instr = block; instr != NULL; instr = instr->next()) {
     if (instr->is_pinned()) do_root(instr);
   }
   set_block(NULL);
   block_do_epilog(block);
 }
 //-------------------------LIRGenerator-----------------------------
 // This is where the tree-walk starts; instr must be root;
 void LIRGenerator::do_root(Value instr) {
   CHECK_BAILOUT();
   InstructionMark im(compilation(), instr);
   assert(instr->is_pinned(), "use only with roots");
   assert(instr->subst() == instr, "shouldn't have missed substitution");
   instr->visit(this);
   assert(!instr->has_uses() || instr->operand()->is_valid() ||
          instr->as_Constant() != NULL || bailed_out(), "invalid item set");
 }
 // This is called for each node in tree; the walk stops if a root is reached
 void LIRGenerator::walk(Value instr) {
   InstructionMark im(compilation(), instr);
   //stop walk when encounter a root
   if (instr->is_pinned() && instr->as_Phi() == NULL || instr->operand()->is_valid()) {
     assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited");
   } else {
     assert(instr->subst() == instr, "shouldn't have missed substitution");
     instr->visit(this);
     // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use");
   }
 }
 CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) {
   int index;
   Value value;
   for_each_stack_value(state, index, value) {
     assert(value->subst() == value, "missed substition");
     if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) {
       walk(value);
       assert(value->operand()->is_valid(), "must be evaluated now");
     }
   }
   ValueStack* s = state;
   int bci = x->bci();
   for_each_state(s) {
     IRScope* scope = s->scope();
     ciMethod* method = scope->method();
     MethodLivenessResult liveness = method->liveness_at_bci(bci);
     if (bci == SynchronizationEntryBCI) {
       if (x->as_ExceptionObject() || x->as_Throw()) {
         // all locals are dead on exit from the synthetic unlocker
         liveness.clear();
       } else {
         assert(x->as_MonitorEnter(), "only other case is MonitorEnter");
       }
     }
     if (!liveness.is_valid()) {
       // Degenerate or breakpointed method.
       bailout("Degenerate or breakpointed method");
     } else {
       assert((int)liveness.size() == s->locals_size(), "error in use of liveness");
       for_each_local_value(s, index, value) {
         assert(value->subst() == value, "missed substition");
         if (liveness.at(index) && !value->type()->is_illegal()) {
           if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) {
             walk(value);
             assert(value->operand()->is_valid(), "must be evaluated now");
           }
         } else {
           // NULL out this local so that linear scan can assume that all non-NULL values are live.
           s->invalidate_local(index);
         }
       }
     }
     bci = scope->caller_bci();
   }
   return new CodeEmitInfo(x->bci(), state, ignore_xhandler ? NULL : x->exception_handlers());
 }
 CodeEmitInfo* LIRGenerator::state_for(Instruction* x) {
   return state_for(x, x->lock_stack());
 }
 void LIRGenerator::jobject2reg_with_patching(LIR_Opr r, ciObject* obj, CodeEmitInfo* info) {
   if (!obj->is_loaded() || PatchALot) {
     assert(info != NULL, "info must be set if class is not loaded");
     __ oop2reg_patch(NULL, r, info);
   } else {
     // no patching needed
     __ oop2reg(obj->encoding(), r);
   }
 }
 void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index,
                                     CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) {
   CodeStub* stub = new RangeCheckStub(range_check_info, index);
   if (index->is_constant()) {
     cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(),
                 index->as_jint(), null_check_info);
     __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch
   } else {
     cmp_reg_mem(lir_cond_aboveEqual, index, array,
                 arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info);
     __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch
   }
 }
 void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) {
   CodeStub* stub = new RangeCheckStub(info, index, true);
   if (index->is_constant()) {
     cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info);
     __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch
   } else {
     cmp_reg_mem(lir_cond_aboveEqual, index, buffer,
                 java_nio_Buffer::limit_offset(), T_INT, info);
     __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch
   }
   __ move(index, result);
 }
 // increment a counter returning the incremented value
 LIR_Opr LIRGenerator::increment_and_return_counter(LIR_Opr base, int offset, int increment) {
   LIR_Address* counter = new LIR_Address(base, offset, T_INT);
   LIR_Opr result = new_register(T_INT);
   __ load(counter, result);
   __ add(result, LIR_OprFact::intConst(increment), result);
   __ store(result, counter);
   return result;
 }
 void LIRGenerator::arithmetic_op(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp_op, CodeEmitInfo* info) {
   LIR_Opr result_op = result;
   LIR_Opr left_op   = left;
   LIR_Opr right_op  = right;
   if (TwoOperandLIRForm && left_op != result_op) {
     assert(right_op != result_op, "malformed");
     __ move(left_op, result_op);
     left_op = result_op;
   }
   switch(code) {
     case Bytecodes::_dadd:
     case Bytecodes::_fadd:
     case Bytecodes::_ladd:
     case Bytecodes::_iadd:  __ add(left_op, right_op, result_op); break;
     case Bytecodes::_fmul:
     case Bytecodes::_lmul:  __ mul(left_op, right_op, result_op); break;
     case Bytecodes::_dmul:
       {
         if (is_strictfp) {
           __ mul_strictfp(left_op, right_op, result_op, tmp_op); break;
         } else {
           __ mul(left_op, right_op, result_op); break;
         }
       }
       break;
     case Bytecodes::_imul:
       {
         bool    did_strength_reduce = false;
         if (right->is_constant()) {
           int c = right->as_jint();
           if (is_power_of_2(c)) {
             // do not need tmp here
             __ shift_left(left_op, exact_log2(c), result_op);
             did_strength_reduce = true;
           } else {
             did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op);
           }
         }
         // we couldn't strength reduce so just emit the multiply
         if (!did_strength_reduce) {
           __ mul(left_op, right_op, result_op);
         }
       }
       break;
     case Bytecodes::_dsub:
     case Bytecodes::_fsub:
     case Bytecodes::_lsub:
     case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break;
     case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break;
     // ldiv and lrem are implemented with a direct runtime call
     case Bytecodes::_ddiv:
       {
         if (is_strictfp) {
           __ div_strictfp (left_op, right_op, result_op, tmp_op); break;
         } else {
           __ div (left_op, right_op, result_op); break;
         }
       }
       break;
     case Bytecodes::_drem:
     case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break;
     default: ShouldNotReachHere();
   }
 }
 void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) {
   arithmetic_op(code, result, left, right, false, tmp);
 }
 void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) {
   arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info);
 }
 void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp) {
   arithmetic_op(code, result, left, right, is_strictfp, tmp);
 }
 void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) {
   if (TwoOperandLIRForm && value != result_op) {
     assert(count != result_op, "malformed");
     __ move(value, result_op);
     value = result_op;
   }
   assert(count->is_constant() || count->is_register(), "must be");
   switch(code) {
   case Bytecodes::_ishl:
   case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break;
   case Bytecodes::_ishr:
   case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break;
   case Bytecodes::_iushr:
   case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break;
   default: ShouldNotReachHere();
   }
 }
 void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) {
   if (TwoOperandLIRForm && left_op != result_op) {
     assert(right_op != result_op, "malformed");
     __ move(left_op, result_op);
     left_op = result_op;
   }
   switch(code) {
     case Bytecodes::_iand:
     case Bytecodes::_land:  __ logical_and(left_op, right_op, result_op); break;
     case Bytecodes::_ior:
     case Bytecodes::_lor:   __ logical_or(left_op, right_op, result_op);  break;
     case Bytecodes::_ixor:
     case Bytecodes::_lxor:  __ logical_xor(left_op, right_op, result_op); break;
     default: ShouldNotReachHere();
   }
 }
 void LIRGenerator::monitor_enter(LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, CodeEmitInfo* info_for_exception, CodeEmitInfo* info) {
   if (!GenerateSynchronizationCode) return;
   // for slow path, use debug info for state after successful locking
   CodeStub* slow_path = new MonitorEnterStub(object, lock, info);
   __ load_stack_address_monitor(monitor_no, lock);
   // for handling NullPointerException, use debug info representing just the lock stack before this monitorenter
   __ lock_object(hdr, object, lock, scratch, slow_path, info_for_exception);
 }
 void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, int monitor_no) {
   if (!GenerateSynchronizationCode) return;
   // setup registers
   LIR_Opr hdr = lock;
   lock = new_hdr;
   CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no);
   __ load_stack_address_monitor(monitor_no, lock);
   __ unlock_object(hdr, object, lock, slow_path);
 }
 void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info) {
   jobject2reg_with_patching(klass_reg, klass, info);
   // If klass is not loaded we do not know if the klass has finalizers:
   if (UseFastNewInstance && klass->is_loaded()
       && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) {
     Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id;
     CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id);
     assert(klass->is_loaded(), "must be loaded");
     // allocate space for instance
     assert(klass->size_helper() >= 0, "illegal instance size");
     const int instance_size = align_object_size(klass->size_helper());
     __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4,
                        oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path);
   } else {
     CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id);
     __ branch(lir_cond_always, T_ILLEGAL, slow_path);
     __ branch_destination(slow_path->continuation());
   }
 }
 static bool is_constant_zero(Instruction* inst) {
   IntConstant* c = inst->type()->as_IntConstant();
   if (c) {
     return (c->value() == 0);
   }
   return false;
 }
 static bool positive_constant(Instruction* inst) {
   IntConstant* c = inst->type()->as_IntConstant();
   if (c) {
     return (c->value() >= 0);
   }
   return false;
 }
 static ciArrayKlass* as_array_klass(ciType* type) {
   if (type != NULL && type->is_array_klass() && type->is_loaded()) {
     return (ciArrayKlass*)type;
   } else {
     return NULL;
   }
 }
 void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) {
   Instruction* src     = x->argument_at(0);
   Instruction* src_pos = x->argument_at(1);
   Instruction* dst     = x->argument_at(2);
   Instruction* dst_pos = x->argument_at(3);
   Instruction* length  = x->argument_at(4);
   // first try to identify the likely type of the arrays involved
   ciArrayKlass* expected_type = NULL;
   bool is_exact = false;
   {
     ciArrayKlass* src_exact_type    = as_array_klass(src->exact_type());
     ciArrayKlass* src_declared_type = as_array_klass(src->declared_type());
     ciArrayKlass* dst_exact_type    = as_array_klass(dst->exact_type());
     ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type());
     if (src_exact_type != NULL && src_exact_type == dst_exact_type) {
       // the types exactly match so the type is fully known
       is_exact = true;
       expected_type = src_exact_type;
     } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) {
       ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type;
       ciArrayKlass* src_type = NULL;
       if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) {
         src_type = (ciArrayKlass*) src_exact_type;
       } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) {
         src_type = (ciArrayKlass*) src_declared_type;
       }
       if (src_type != NULL) {
         if (src_type->element_type()->is_subtype_of(dst_type->element_type())) {
           is_exact = true;
           expected_type = dst_type;
         }
       }
     }
     // at least pass along a good guess
     if (expected_type == NULL) expected_type = dst_exact_type;
     if (expected_type == NULL) expected_type = src_declared_type;
     if (expected_type == NULL) expected_type = dst_declared_type;
   }
   // if a probable array type has been identified, figure out if any
   // of the required checks for a fast case can be elided.
   int flags = LIR_OpArrayCopy::all_flags;
   if (expected_type != NULL) {
     // try to skip null checks
     if (src->as_NewArray() != NULL)
       flags &= ~LIR_OpArrayCopy::src_null_check;
     if (dst->as_NewArray() != NULL)
       flags &= ~LIR_OpArrayCopy::dst_null_check;
     // check from incoming constant values
     if (positive_constant(src_pos))
       flags &= ~LIR_OpArrayCopy::src_pos_positive_check;
     if (positive_constant(dst_pos))
       flags &= ~LIR_OpArrayCopy::dst_pos_positive_check;
     if (positive_constant(length))
       flags &= ~LIR_OpArrayCopy::length_positive_check;
     // see if the range check can be elided, which might also imply
     // that src or dst is non-null.
     ArrayLength* al = length->as_ArrayLength();
     if (al != NULL) {
       if (al->array() == src) {
         // it's the length of the source array
         flags &= ~LIR_OpArrayCopy::length_positive_check;
         flags &= ~LIR_OpArrayCopy::src_null_check;
         if (is_constant_zero(src_pos))
           flags &= ~LIR_OpArrayCopy::src_range_check;
       }
       if (al->array() == dst) {
         // it's the length of the destination array
         flags &= ~LIR_OpArrayCopy::length_positive_check;
         flags &= ~LIR_OpArrayCopy::dst_null_check;
         if (is_constant_zero(dst_pos))
           flags &= ~LIR_OpArrayCopy::dst_range_check;
       }
     }
     if (is_exact) {
       flags &= ~LIR_OpArrayCopy::type_check;
     }
   }
   if (src == dst) {
     // moving within a single array so no type checks are needed
     if (flags & LIR_OpArrayCopy::type_check) {
       flags &= ~LIR_OpArrayCopy::type_check;
     }
   }
   *flagsp = flags;
   *expected_typep = (ciArrayKlass*)expected_type;
 }
 LIR_Opr LIRGenerator::round_item(LIR_Opr opr) {
   assert(opr->is_register(), "why spill if item is not register?");
   if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) {
     LIR_Opr result = new_register(T_FLOAT);
     set_vreg_flag(result, must_start_in_memory);
     assert(opr->is_register(), "only a register can be spilled");
     assert(opr->value_type()->is_float(), "rounding only for floats available");
     __ roundfp(opr, LIR_OprFact::illegalOpr, result);
     return result;
   }
   return opr;
 }
 LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) {
   assert(type2size[t] == type2size[value->type()], "size mismatch");
   if (!value->is_register()) {
     // force into a register
     LIR_Opr r = new_register(value->type());
     __ move(value, r);
     value = r;
   }
   // create a spill location
   LIR_Opr tmp = new_register(t);
   set_vreg_flag(tmp, LIRGenerator::must_start_in_memory);
   // move from register to spill
   __ move(value, tmp);
   return tmp;
 }
 void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) {
   if (if_instr->should_profile()) {
     ciMethod* method = if_instr->profiled_method();
     assert(method != NULL, "method should be set if branch is profiled");
     ciMethodData* md = method->method_data();
     if (md == NULL) {
       bailout("out of memory building methodDataOop");
       return;
     }
     ciProfileData* data = md->bci_to_data(if_instr->profiled_bci());
     assert(data != NULL, "must have profiling data");
     assert(data->is_BranchData(), "need BranchData for two-way branches");
     int taken_count_offset     = md->byte_offset_of_slot(data, BranchData::taken_offset());
     int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset());
     LIR_Opr md_reg = new_register(T_OBJECT);
     __ move(LIR_OprFact::oopConst(md->encoding()), md_reg);
     LIR_Opr data_offset_reg = new_register(T_INT);
     __ cmove(lir_cond(cond),
              LIR_OprFact::intConst(taken_count_offset),
              LIR_OprFact::intConst(not_taken_count_offset),
              data_offset_reg);
     LIR_Opr data_reg = new_register(T_INT);
     LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, T_INT);
     __ move(LIR_OprFact::address(data_addr), data_reg);
     LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT);
     // Use leal instead of add to avoid destroying condition codes on x86
     __ leal(LIR_OprFact::address(fake_incr_value), data_reg);
     __ move(data_reg, LIR_OprFact::address(data_addr));
   }
 }
 // Phi technique:
 // This is about passing live values from one basic block to the other.
 // In code generated with Java it is rather rare that more than one
 // value is on the stack from one basic block to the other.
 // We optimize our technique for efficient passing of one value
 // (of type long, int, double..) but it can be extended.
 // When entering or leaving a basic block, all registers and all spill
 // slots are release and empty. We use the released registers
 // and spill slots to pass the live values from one block
 // to the other. The topmost value, i.e., the value on TOS of expression
 // stack is passed in registers. All other values are stored in spilling
 // area. Every Phi has an index which designates its spill slot
 // At exit of a basic block, we fill the register(s) and spill slots.
 // At entry of a basic block, the block_prolog sets up the content of phi nodes
 // and locks necessary registers and spilling slots.
 // move current value to referenced phi function
 void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) {
   Phi* phi = sux_val->as_Phi();
   // cur_val can be null without phi being null in conjunction with inlining
   if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) {
     LIR_Opr operand = cur_val->operand();
     if (cur_val->operand()->is_illegal()) {
       assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL,
              "these can be produced lazily");
       operand = operand_for_instruction(cur_val);
     }
     resolver->move(operand, operand_for_instruction(phi));
   }
 }
 // Moves all stack values into their PHI position
 void LIRGenerator::move_to_phi(ValueStack* cur_state) {
   BlockBegin* bb = block();
   if (bb->number_of_sux() == 1) {
     BlockBegin* sux = bb->sux_at(0);
     assert(sux->number_of_preds() > 0, "invalid CFG");
     // a block with only one predecessor never has phi functions
     if (sux->number_of_preds() > 1) {
       int max_phis = cur_state->stack_size() + cur_state->locals_size();
       PhiResolver resolver(this, _virtual_register_number + max_phis * 2);
       ValueStack* sux_state = sux->state();
       Value sux_value;
       int index;
       for_each_stack_value(sux_state, index, sux_value) {
         move_to_phi(&resolver, cur_state->stack_at(index), sux_value);
       }
       // Inlining may cause the local state not to match up, so walk up
       // the caller state until we get to the same scope as the
       // successor and then start processing from there.
       while (cur_state->scope() != sux_state->scope()) {
         cur_state = cur_state->caller_state();
         assert(cur_state != NULL, "scopes don't match up");
       }
       for_each_local_value(sux_state, index, sux_value) {
         move_to_phi(&resolver, cur_state->local_at(index), sux_value);
       }
       assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal");
     }
   }
 }
 LIR_Opr LIRGenerator::new_register(BasicType type) {
   int vreg = _virtual_register_number;
   // add a little fudge factor for the bailout, since the bailout is
   // only checked periodically.  This gives a few extra registers to
   // hand out before we really run out, which helps us keep from
   // tripping over assertions.
   if (vreg + 20 >= LIR_OprDesc::vreg_max) {
     bailout("out of virtual registers");
     if (vreg + 2 >= LIR_OprDesc::vreg_max) {
       // wrap it around
       _virtual_register_number = LIR_OprDesc::vreg_base;
     }
   }
   _virtual_register_number += 1;
   if (type == T_ADDRESS) type = T_INT;
   return LIR_OprFact::virtual_register(vreg, type);
 }
 // Try to lock using register in hint
 LIR_Opr LIRGenerator::rlock(Value instr) {
   return new_register(instr->type());
 }
 // does an rlock and sets result
 LIR_Opr LIRGenerator::rlock_result(Value x) {
   LIR_Opr reg = rlock(x);
   set_result(x, reg);
   return reg;
 }
 // does an rlock and sets result
 LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) {
   LIR_Opr reg;
   switch (type) {
   case T_BYTE:
   case T_BOOLEAN:
     reg = rlock_byte(type);
     break;
   default:
     reg = rlock(x);
     break;
   }
   set_result(x, reg);
   return reg;
 }
 //---------------------------------------------------------------------
 ciObject* LIRGenerator::get_jobject_constant(Value value) {
   ObjectType* oc = value->type()->as_ObjectType();
   if (oc) {
     return oc->constant_value();
   }
   return NULL;
 }
 void LIRGenerator::do_ExceptionObject(ExceptionObject* x) {
   assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block");
   assert(block()->next() == x, "ExceptionObject must be first instruction of block");
   // no moves are created for phi functions at the begin of exception
   // handlers, so assign operands manually here
   for_each_phi_fun(block(), phi,
                    operand_for_instruction(phi));
   LIR_Opr thread_reg = getThreadPointer();
   __ move(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT),
           exceptionOopOpr());
   __ move(LIR_OprFact::oopConst(NULL),
           new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT));
   __ move(LIR_OprFact::oopConst(NULL),
           new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT));
   LIR_Opr result = new_register(T_OBJECT);
   __ move(exceptionOopOpr(), result);
   set_result(x, result);
 }
 //----------------------------------------------------------------------
 //----------------------------------------------------------------------
 //----------------------------------------------------------------------
 //----------------------------------------------------------------------
 //                        visitor functions
 //----------------------------------------------------------------------
 //----------------------------------------------------------------------
 //----------------------------------------------------------------------
 //----------------------------------------------------------------------
 void LIRGenerator::do_Phi(Phi* x) {
   // phi functions are never visited directly
   ShouldNotReachHere();
 }
 // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined.
 void LIRGenerator::do_Constant(Constant* x) {
   if (x->state() != NULL) {
     // Any constant with a ValueStack requires patching so emit the patch here
     LIR_Opr reg = rlock_result(x);
     CodeEmitInfo* info = state_for(x, x->state());
     __ oop2reg_patch(NULL, reg, info);
   } else if (x->use_count() > 1 && !can_inline_as_constant(x)) {
     if (!x->is_pinned()) {
       // unpinned constants are handled specially so that they can be
       // put into registers when they are used multiple times within a
       // block.  After the block completes their operand will be
       // cleared so that other blocks can't refer to that register.
       set_result(x, load_constant(x));
     } else {
       LIR_Opr res = x->operand();
       if (!res->is_valid()) {
         res = LIR_OprFact::value_type(x->type());
       }
       if (res->is_constant()) {
         LIR_Opr reg = rlock_result(x);
         __ move(res, reg);
       } else {
         set_result(x, res);
       }
     }
   } else {
     set_result(x, LIR_OprFact::value_type(x->type()));
   }
 }
 void LIRGenerator::do_Local(Local* x) {
   // operand_for_instruction has the side effect of setting the result
   // so there's no need to do it here.
   operand_for_instruction(x);
 }
 void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) {
   Unimplemented();
 }
 void LIRGenerator::do_Return(Return* x) {
   if (DTraceMethodProbes) {
     BasicTypeList signature;
     signature.append(T_INT);    // thread
     signature.append(T_OBJECT); // methodOop
     LIR_OprList* args = new LIR_OprList();
     args->append(getThreadPointer());
     LIR_Opr meth = new_register(T_OBJECT);
     __ oop2reg(method()->encoding(), meth);
     args->append(meth);
     call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL);
   }
   if (x->type()->is_void()) {
     __ return_op(LIR_OprFact::illegalOpr);
   } else {
     LIR_Opr reg = result_register_for(x->type(), /*callee=*/true);
     LIRItem result(x->result(), this);
     result.load_item_force(reg);
     __ return_op(result.result());
   }
   set_no_result(x);
 }
 // Example: object.getClass ()
 void LIRGenerator::do_getClass(Intrinsic* x) {
   assert(x->number_of_arguments() == 1, "wrong type");
   LIRItem rcvr(x->argument_at(0), this);
   rcvr.load_item();
   LIR_Opr result = rlock_result(x);
   // need to perform the null check on the rcvr
   CodeEmitInfo* info = NULL;
   if (x->needs_null_check()) {
     info = state_for(x, x->state()->copy_locks());
   }
   __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_OBJECT), result, info);
   __ move(new LIR_Address(result, Klass::java_mirror_offset_in_bytes() +
                           klassOopDesc::klass_part_offset_in_bytes(), T_OBJECT), result);
 }
 // Example: Thread.currentThread()
 void LIRGenerator::do_currentThread(Intrinsic* x) {
   assert(x->number_of_arguments() == 0, "wrong type");
   LIR_Opr reg = rlock_result(x);
   __ load(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg);
 }
 void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) {
   assert(x->number_of_arguments() == 1, "wrong type");
   LIRItem receiver(x->argument_at(0), this);
   receiver.load_item();
   BasicTypeList signature;
   signature.append(T_OBJECT); // receiver
   LIR_OprList* args = new LIR_OprList();
   args->append(receiver.result());
   CodeEmitInfo* info = state_for(x, x->state());
   call_runtime(&signature, args,
                CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)),
                voidType, info);
   set_no_result(x);
 }
 //------------------------local access--------------------------------------
 LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) {
   if (x->operand()->is_illegal()) {
     Constant* c = x->as_Constant();
     if (c != NULL) {
       x->set_operand(LIR_OprFact::value_type(c->type()));
     } else {
       assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local");
       // allocate a virtual register for this local or phi
       x->set_operand(rlock(x));
       _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL);
     }
   }
   return x->operand();
 }
 Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) {
   if (opr->is_virtual()) {
     return instruction_for_vreg(opr->vreg_number());
   }
   return NULL;
 }
 Instruction* LIRGenerator::instruction_for_vreg(int reg_num) {
   if (reg_num < _instruction_for_operand.length()) {
     return _instruction_for_operand.at(reg_num);
   }
   return NULL;
 }
 void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) {
   if (_vreg_flags.size_in_bits() == 0) {
     BitMap2D temp(100, num_vreg_flags);
     temp.clear();
     _vreg_flags = temp;
   }
   _vreg_flags.at_put_grow(vreg_num, f, true);
 }
 bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) {
   if (!_vreg_flags.is_valid_index(vreg_num, f)) {
     return false;
   }
   return _vreg_flags.at(vreg_num, f);
 }
 // Block local constant handling.  This code is useful for keeping
 // unpinned constants and constants which aren't exposed in the IR in
 // registers.  Unpinned Constant instructions have their operands
 // cleared when the block is finished so that other blocks can't end
 // up referring to their registers.
 LIR_Opr LIRGenerator::load_constant(Constant* x) {
   assert(!x->is_pinned(), "only for unpinned constants");
   _unpinned_constants.append(x);
   return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr());
 }
 LIR_Opr LIRGenerator::load_constant(LIR_Const* c) {
   BasicType t = c->type();
   for (int i = 0; i < _constants.length(); i++) {
     LIR_Const* other = _constants.at(i);
     if (t == other->type()) {
       switch (t) {
       case T_INT:
       case T_FLOAT:
         if (c->as_jint_bits() != other->as_jint_bits()) continue;
         break;
       case T_LONG:
       case T_DOUBLE:
         if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue;
         if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue;
         break;
       case T_OBJECT:
         if (c->as_jobject() != other->as_jobject()) continue;
         break;
       }
       return _reg_for_constants.at(i);
     }
   }
   LIR_Opr result = new_register(t);
   __ move((LIR_Opr)c, result);
   _constants.append(c);
   _reg_for_constants.append(result);
   return result;
 }
 // Various barriers
 void LIRGenerator::pre_barrier(LIR_Opr addr_opr, bool patch,  CodeEmitInfo* info) {
   // Do the pre-write barrier, if any.
   switch (_bs->kind()) {
 #ifndef SERIALGC
     case BarrierSet::G1SATBCT:
     case BarrierSet::G1SATBCTLogging:
       G1SATBCardTableModRef_pre_barrier(addr_opr, patch, info);
       break;
 #endif // SERIALGC
     case BarrierSet::CardTableModRef:
     case BarrierSet::CardTableExtension:
       // No pre barriers
       break;
     case BarrierSet::ModRef:
     case BarrierSet::Other:
       // No pre barriers
       break;
     default      :
       ShouldNotReachHere();
   }
 }
 void LIRGenerator::post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) {
   switch (_bs->kind()) {
 #ifndef SERIALGC
     case BarrierSet::G1SATBCT:
     case BarrierSet::G1SATBCTLogging:
       G1SATBCardTableModRef_post_barrier(addr,  new_val);
       break;
 #endif // SERIALGC
     case BarrierSet::CardTableModRef:
     case BarrierSet::CardTableExtension:
       CardTableModRef_post_barrier(addr,  new_val);
       break;
     case BarrierSet::ModRef:
     case BarrierSet::Other:
       // No post barriers
       break;
     default      :
       ShouldNotReachHere();
     }
 }
 ////////////////////////////////////////////////////////////////////////
 #ifndef SERIALGC
 void LIRGenerator::G1SATBCardTableModRef_pre_barrier(LIR_Opr addr_opr, bool patch,  CodeEmitInfo* info) {
   if (G1DisablePreBarrier) return;
   // First we test whether marking is in progress.
   BasicType flag_type;
   if (in_bytes(PtrQueue::byte_width_of_active()) == 4) {
     flag_type = T_INT;
   } else {
     guarantee(in_bytes(PtrQueue::byte_width_of_active()) == 1,
               "Assumption");
     flag_type = T_BYTE;
   }
   LIR_Opr thrd = getThreadPointer();
   LIR_Address* mark_active_flag_addr =
     new LIR_Address(thrd,
                     in_bytes(JavaThread::satb_mark_queue_offset() +
                              PtrQueue::byte_offset_of_active()),
                     flag_type);
   // Read the marking-in-progress flag.
   LIR_Opr flag_val = new_register(T_INT);
   __ load(mark_active_flag_addr, flag_val);
   LabelObj* start_store = new LabelObj();
   LIR_PatchCode pre_val_patch_code =
     patch ? lir_patch_normal : lir_patch_none;
   LIR_Opr pre_val = new_register(T_OBJECT);
   __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0));
   if (!addr_opr->is_address()) {
     assert(addr_opr->is_register(), "must be");
     addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, 0, T_OBJECT));
   }
   CodeStub* slow = new G1PreBarrierStub(addr_opr, pre_val, pre_val_patch_code,
                                         info);
   __ branch(lir_cond_notEqual, T_INT, slow);
   __ branch_destination(slow->continuation());
 }
 void LIRGenerator::G1SATBCardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) {
   if (G1DisablePostBarrier) return;
   // If the "new_val" is a constant NULL, no barrier is necessary.
   if (new_val->is_constant() &&
       new_val->as_constant_ptr()->as_jobject() == NULL) return;
   if (!new_val->is_register()) {
     LIR_Opr new_val_reg = new_pointer_register();
     if (new_val->is_constant()) {
       __ move(new_val, new_val_reg);
     } else {
       __ leal(new_val, new_val_reg);
     }
     new_val = new_val_reg;
   }
   assert(new_val->is_register(), "must be a register at this point");
   if (addr->is_address()) {
     LIR_Address* address = addr->as_address_ptr();
     LIR_Opr ptr = new_pointer_register();
     if (!address->index()->is_valid() && address->disp() == 0) {
       __ move(address->base(), ptr);
     } else {
       assert(address->disp() != max_jint, "lea doesn't support patched addresses!");
       __ leal(addr, ptr);
     }
     addr = ptr;
   }
   assert(addr->is_register(), "must be a register at this point");
   LIR_Opr xor_res = new_pointer_register();
   LIR_Opr xor_shift_res = new_pointer_register();
   if (TwoOperandLIRForm ) {
     __ move(addr, xor_res);
     __ logical_xor(xor_res, new_val, xor_res);
     __ move(xor_res, xor_shift_res);
     __ unsigned_shift_right(xor_shift_res,
                             LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes),
                             xor_shift_res,
                             LIR_OprDesc::illegalOpr());
   } else {
     __ logical_xor(addr, new_val, xor_res);
     __ unsigned_shift_right(xor_res,
                             LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes),
                             xor_shift_res,
                             LIR_OprDesc::illegalOpr());
   }
   if (!new_val->is_register()) {
     LIR_Opr new_val_reg = new_pointer_register();
     __ leal(new_val, new_val_reg);
     new_val = new_val_reg;
   }
   assert(new_val->is_register(), "must be a register at this point");
   __ cmp(lir_cond_notEqual, xor_shift_res, LIR_OprFact::intptrConst(NULL_WORD));
   CodeStub* slow = new G1PostBarrierStub(addr, new_val);
   __ branch(lir_cond_notEqual, T_INT, slow);
   __ branch_destination(slow->continuation());
 }
 #endif // SERIALGC
 ////////////////////////////////////////////////////////////////////////
 void LIRGenerator::CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) {
   assert(sizeof(*((CardTableModRefBS*)_bs)->byte_map_base) == sizeof(jbyte), "adjust this code");
   LIR_Const* card_table_base = new LIR_Const(((CardTableModRefBS*)_bs)->byte_map_base);
   if (addr->is_address()) {
     LIR_Address* address = addr->as_address_ptr();
     LIR_Opr ptr = new_register(T_OBJECT);
     if (!address->index()->is_valid() && address->disp() == 0) {
       __ move(address->base(), ptr);
     } else {
       assert(address->disp() != max_jint, "lea doesn't support patched addresses!");
       __ leal(addr, ptr);
     }
     addr = ptr;
   }
   assert(addr->is_register(), "must be a register at this point");
   LIR_Opr tmp = new_pointer_register();
   if (TwoOperandLIRForm) {
     __ move(addr, tmp);
     __ unsigned_shift_right(tmp, CardTableModRefBS::card_shift, tmp);
   } else {
     __ unsigned_shift_right(addr, CardTableModRefBS::card_shift, tmp);
   }
   if (can_inline_as_constant(card_table_base)) {
     __ move(LIR_OprFact::intConst(0),
               new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE));
   } else {
     __ move(LIR_OprFact::intConst(0),
               new LIR_Address(tmp, load_constant(card_table_base),
                               T_BYTE));
   }
 }
 //------------------------field access--------------------------------------
 // Comment copied form templateTable_i486.cpp
 // ----------------------------------------------------------------------------
 // Volatile variables demand their effects be made known to all CPU's in
 // order.  Store buffers on most chips allow reads & writes to reorder; the
 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of
 // memory barrier (i.e., it's not sufficient that the interpreter does not
 // reorder volatile references, the hardware also must not reorder them).
 //
 // According to the new Java Memory Model (JMM):
 // (1) All volatiles are serialized wrt to each other.
 // ALSO reads & writes act as aquire & release, so:
 // (2) A read cannot let unrelated NON-volatile memory refs that happen after
 // the read float up to before the read.  It's OK for non-volatile memory refs
 // that happen before the volatile read to float down below it.
 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs
 // that happen BEFORE the write float down to after the write.  It's OK for
 // non-volatile memory refs that happen after the volatile write to float up
 // before it.
 //
 // We only put in barriers around volatile refs (they are expensive), not
 // _between_ memory refs (that would require us to track the flavor of the
 // previous memory refs).  Requirements (2) and (3) require some barriers
 // before volatile stores and after volatile loads.  These nearly cover
 // requirement (1) but miss the volatile-store-volatile-load case.  This final
 // case is placed after volatile-stores although it could just as well go
 // before volatile-loads.
 void LIRGenerator::do_StoreField(StoreField* x) {
   bool needs_patching = x->needs_patching();
   bool is_volatile = x->field()->is_volatile();
   BasicType field_type = x->field_type();
   bool is_oop = (field_type == T_ARRAY || field_type == T_OBJECT);
   CodeEmitInfo* info = NULL;
   if (needs_patching) {
     assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access");
     info = state_for(x, x->state_before());
   } else if (x->needs_null_check()) {
     NullCheck* nc = x->explicit_null_check();
     if (nc == NULL) {
       info = state_for(x, x->lock_stack());
     } else {
       info = state_for(nc);
     }
   }
   LIRItem object(x->obj(), this);
   LIRItem value(x->value(),  this);
   object.load_item();
   if (is_volatile || needs_patching) {
     // load item if field is volatile (fewer special cases for volatiles)
     // load item if field not initialized
     // load item if field not constant
     // because of code patching we cannot inline constants
     if (field_type == T_BYTE || field_type == T_BOOLEAN) {
       value.load_byte_item();
     } else  {
       value.load_item();
     }
   } else {
     value.load_for_store(field_type);
   }
   set_no_result(x);
   if (PrintNotLoaded && needs_patching) {
     tty->print_cr("   ###class not loaded at store_%s bci %d",
                   x->is_static() ?  "static" : "field", x->bci());
   }
   if (x->needs_null_check() &&
       (needs_patching ||
        MacroAssembler::needs_explicit_null_check(x->offset()))) {
     // emit an explicit null check because the offset is too large
     __ null_check(object.result(), new CodeEmitInfo(info));
   }
   LIR_Address* address;
   if (needs_patching) {
     // we need to patch the offset in the instruction so don't allow
     // generate_address to try to be smart about emitting the -1.
     // Otherwise the patching code won't know how to find the
     // instruction to patch.
     address = new LIR_Address(object.result(), max_jint, field_type);
   } else {
     address = generate_address(object.result(), x->offset(), field_type);
   }
   if (is_volatile && os::is_MP()) {
     __ membar_release();
   }
   if (is_oop) {
     // Do the pre-write barrier, if any.
     pre_barrier(LIR_OprFact::address(address),
                 needs_patching,
                 (info ? new CodeEmitInfo(info) : NULL));
   }
   if (is_volatile) {
     assert(!needs_patching && x->is_loaded(),
            "how do we know it's volatile if it's not loaded");
     volatile_field_store(value.result(), address, info);
   } else {
     LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none;
     __ store(value.result(), address, info, patch_code);
   }
   if (is_oop) {
 #ifdef PRECISE_CARDMARK
     // Precise cardmarks don't work
     post_barrier(LIR_OprFact::address(address), value.result());
 #else
     post_barrier(object.result(), value.result());
 #endif // PRECISE_CARDMARK
   }
   if (is_volatile && os::is_MP()) {
     __ membar();
   }
 }
 void LIRGenerator::do_LoadField(LoadField* x) {
   bool needs_patching = x->needs_patching();
   bool is_volatile = x->field()->is_volatile();
   BasicType field_type = x->field_type();
   CodeEmitInfo* info = NULL;
   if (needs_patching) {
     assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access");
     info = state_for(x, x->state_before());
   } else if (x->needs_null_check()) {
     NullCheck* nc = x->explicit_null_check();
     if (nc == NULL) {
       info = state_for(x, x->lock_stack());
     } else {
       info = state_for(nc);
     }
   }
   LIRItem object(x->obj(), this);
   object.load_item();
   if (PrintNotLoaded && needs_patching) {
     tty->print_cr("   ###class not loaded at load_%s bci %d",
                   x->is_static() ?  "static" : "field", x->bci());
   }
   if (x->needs_null_check() &&
       (needs_patching ||
        MacroAssembler::needs_explicit_null_check(x->offset()))) {
     // emit an explicit null check because the offset is too large
     __ null_check(object.result(), new CodeEmitInfo(info));
   }
   LIR_Opr reg = rlock_result(x, field_type);
   LIR_Address* address;
   if (needs_patching) {
     // we need to patch the offset in the instruction so don't allow
     // generate_address to try to be smart about emitting the -1.
     // Otherwise the patching code won't know how to find the
     // instruction to patch.
     address = new LIR_Address(object.result(), max_jint, field_type);
   } else {
     address = generate_address(object.result(), x->offset(), field_type);
   }
   if (is_volatile) {
     assert(!needs_patching && x->is_loaded(),
            "how do we know it's volatile if it's not loaded");
     volatile_field_load(address, reg, info);
   } else {
     LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none;
     __ load(address, reg, info, patch_code);
   }
   if (is_volatile && os::is_MP()) {
     __ membar_acquire();
   }
 }
 //------------------------java.nio.Buffer.checkIndex------------------------
 // int java.nio.Buffer.checkIndex(int)
 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) {
   // NOTE: by the time we are in checkIndex() we are guaranteed that
   // the buffer is non-null (because checkIndex is package-private and
   // only called from within other methods in the buffer).
   assert(x->number_of_arguments() == 2, "wrong type");
   LIRItem buf  (x->argument_at(0), this);
   LIRItem index(x->argument_at(1), this);
   buf.load_item();
   index.load_item();
   LIR_Opr result = rlock_result(x);
   if (GenerateRangeChecks) {
     CodeEmitInfo* info = state_for(x);
     CodeStub* stub = new RangeCheckStub(info, index.result(), true);
     if (index.result()->is_constant()) {
       cmp_mem_int(lir_cond_belowEqual, buf.result(), java_nio_Buffer::limit_offset(), index.result()->as_jint(), info);
       __ branch(lir_cond_belowEqual, T_INT, stub);
     } else {
       cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf.result(),
                   java_nio_Buffer::limit_offset(), T_INT, info);
       __ branch(lir_cond_aboveEqual, T_INT, stub);
     }
     __ move(index.result(), result);
   } else {
     // Just load the index into the result register
     __ move(index.result(), result);
   }
 }
 //------------------------array access--------------------------------------
 void LIRGenerator::do_ArrayLength(ArrayLength* x) {
   LIRItem array(x->array(), this);
   array.load_item();
   LIR_Opr reg = rlock_result(x);
   CodeEmitInfo* info = NULL;
   if (x->needs_null_check()) {
     NullCheck* nc = x->explicit_null_check();
     if (nc == NULL) {
       info = state_for(x);
     } else {
       info = state_for(nc);
     }
   }
   __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none);
 }
 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) {
   bool use_length = x->length() != NULL;
   LIRItem array(x->array(), this);
   LIRItem index(x->index(), this);
   LIRItem length(this);
   bool needs_range_check = true;
   if (use_length) {
     needs_range_check = x->compute_needs_range_check();
     if (needs_range_check) {
       length.set_instruction(x->length());
       length.load_item();
     }
   }
   array.load_item();
   if (index.is_constant() && can_inline_as_constant(x->index())) {
     // let it be a constant
     index.dont_load_item();
   } else {
     index.load_item();
   }
   CodeEmitInfo* range_check_info = state_for(x);
   CodeEmitInfo* null_check_info = NULL;
   if (x->needs_null_check()) {
     NullCheck* nc = x->explicit_null_check();
     if (nc != NULL) {
       null_check_info = state_for(nc);
     } else {
       null_check_info = range_check_info;
     }
   }
   // emit array address setup early so it schedules better
   LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), false);
   if (GenerateRangeChecks && needs_range_check) {
     if (use_length) {
       // TODO: use a (modified) version of array_range_check that does not require a
       //       constant length to be loaded to a register
       __ cmp(lir_cond_belowEqual, length.result(), index.result());
       __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result()));
     } else {
       array_range_check(array.result(), index.result(), null_check_info, range_check_info);
       // The range check performs the null check, so clear it out for the load
       null_check_info = NULL;
     }
   }
   __ move(array_addr, rlock_result(x, x->elt_type()), null_check_info);
 }
 void LIRGenerator::do_NullCheck(NullCheck* x) {
   if (x->can_trap()) {
     LIRItem value(x->obj(), this);
     value.load_item();
     CodeEmitInfo* info = state_for(x);
     __ null_check(value.result(), info);
   }
 }
 void LIRGenerator::do_Throw(Throw* x) {
   LIRItem exception(x->exception(), this);
   exception.load_item();
   set_no_result(x);
   LIR_Opr exception_opr = exception.result();
   CodeEmitInfo* info = state_for(x, x->state());
 #ifndef PRODUCT
   if (PrintC1Statistics) {
     increment_counter(Runtime1::throw_count_address());
   }
 #endif
   // check if the instruction has an xhandler in any of the nested scopes
   bool unwind = false;
   if (info->exception_handlers()->length() == 0) {
     // this throw is not inside an xhandler
     unwind = true;
   } else {
     // get some idea of the throw type
     bool type_is_exact = true;
     ciType* throw_type = x->exception()->exact_type();
     if (throw_type == NULL) {
       type_is_exact = false;
       throw_type = x->exception()->declared_type();
     }
     if (throw_type != NULL && throw_type->is_instance_klass()) {
       ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type;
       unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact);
     }
   }
   // do null check before moving exception oop into fixed register
   // to avoid a fixed interval with an oop during the null check.
   // Use a copy of the CodeEmitInfo because debug information is
   // different for null_check and throw.
   if (GenerateCompilerNullChecks &&
       (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL)) {
     // if the exception object wasn't created using new then it might be null.
     __ null_check(exception_opr, new CodeEmitInfo(info, true));
   }
   if (JvmtiExport::can_post_exceptions() &&
       !block()->is_set(BlockBegin::default_exception_handler_flag)) {
     // we need to go through the exception lookup path to get JVMTI
     // notification done
     unwind = false;
   }
   assert(!block()->is_set(BlockBegin::default_exception_handler_flag) || unwind,
          "should be no more handlers to dispatch to");
   if (DTraceMethodProbes &&
       block()->is_set(BlockBegin::default_exception_handler_flag)) {
     // notify that this frame is unwinding
     BasicTypeList signature;
     signature.append(T_INT);    // thread
     signature.append(T_OBJECT); // methodOop
     LIR_OprList* args = new LIR_OprList();
     args->append(getThreadPointer());
     LIR_Opr meth = new_register(T_OBJECT);
     __ oop2reg(method()->encoding(), meth);
     args->append(meth);
     call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL);
   }
   // move exception oop into fixed register
   __ move(exception_opr, exceptionOopOpr());
   if (unwind) {
     __ unwind_exception(LIR_OprFact::illegalOpr, exceptionOopOpr(), info);
   } else {
     __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info);
   }
 }
 void LIRGenerator::do_RoundFP(RoundFP* x) {
   LIRItem input(x->input(), this);
   input.load_item();
   LIR_Opr input_opr = input.result();
   assert(input_opr->is_register(), "why round if value is not in a register?");
   assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value");
   if (input_opr->is_single_fpu()) {
     set_result(x, round_item(input_opr)); // This code path not currently taken
   } else {
     LIR_Opr result = new_register(T_DOUBLE);
     set_vreg_flag(result, must_start_in_memory);
     __ roundfp(input_opr, LIR_OprFact::illegalOpr, result);
     set_result(x, result);
   }
 }
 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) {
   LIRItem base(x->base(), this);
   LIRItem idx(this);
   base.load_item();
   if (x->has_index()) {
     idx.set_instruction(x->index());
     idx.load_nonconstant();
   }
   LIR_Opr reg = rlock_result(x, x->basic_type());
   int   log2_scale = 0;
   if (x->has_index()) {
     assert(x->index()->type()->tag() == intTag, "should not find non-int index");
     log2_scale = x->log2_scale();
   }
   assert(!x->has_index() || idx.value() == x->index(), "should match");
   LIR_Opr base_op = base.result();
 #ifndef _LP64
   if (x->base()->type()->tag() == longTag) {
     base_op = new_register(T_INT);
     __ convert(Bytecodes::_l2i, base.result(), base_op);
   } else {
     assert(x->base()->type()->tag() == intTag, "must be");
   }
 #endif
   BasicType dst_type = x->basic_type();
   LIR_Opr index_op = idx.result();
   LIR_Address* addr;
   if (index_op->is_constant()) {
     assert(log2_scale == 0, "must not have a scale");
     addr = new LIR_Address(base_op, index_op->as_jint(), dst_type);
   } else {
 #ifdef X86
     addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type);
 #else
     if (index_op->is_illegal() || log2_scale == 0) {
       addr = new LIR_Address(base_op, index_op, dst_type);
     } else {
       LIR_Opr tmp = new_register(T_INT);
       __ shift_left(index_op, log2_scale, tmp);
       addr = new LIR_Address(base_op, tmp, dst_type);
     }
 #endif
   }
   if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) {
     __ unaligned_move(addr, reg);
   } else {
     __ move(addr, reg);
   }
 }
 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) {
   int  log2_scale = 0;
   BasicType type = x->basic_type();
   if (x->has_index()) {
     assert(x->index()->type()->tag() == intTag, "should not find non-int index");
     log2_scale = x->log2_scale();
   }
   LIRItem base(x->base(), this);
   LIRItem value(x->value(), this);
   LIRItem idx(this);
   base.load_item();
   if (x->has_index()) {
     idx.set_instruction(x->index());
     idx.load_item();
   }
   if (type == T_BYTE || type == T_BOOLEAN) {
     value.load_byte_item();
   } else {
     value.load_item();
   }
   set_no_result(x);
   LIR_Opr base_op = base.result();
 #ifndef _LP64
   if (x->base()->type()->tag() == longTag) {
     base_op = new_register(T_INT);
     __ convert(Bytecodes::_l2i, base.result(), base_op);
   } else {
     assert(x->base()->type()->tag() == intTag, "must be");
   }
 #endif
   LIR_Opr index_op = idx.result();
   if (log2_scale != 0) {
     // temporary fix (platform dependent code without shift on Intel would be better)
     index_op = new_register(T_INT);
     __ move(idx.result(), index_op);
     __ shift_left(index_op, log2_scale, index_op);
   }
   LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type());
   __ move(value.result(), addr);
 }
 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) {
   BasicType type = x->basic_type();
   LIRItem src(x->object(), this);
   LIRItem off(x->offset(), this);
   off.load_item();
   src.load_item();
   LIR_Opr reg = reg = rlock_result(x, x->basic_type());
   if (x->is_volatile() && os::is_MP()) __ membar_acquire();
   get_Object_unsafe(reg, src.result(), off.result(), type, x->is_volatile());
   if (x->is_volatile() && os::is_MP()) __ membar();
 }
 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) {
   BasicType type = x->basic_type();
   LIRItem src(x->object(), this);
   LIRItem off(x->offset(), this);
   LIRItem data(x->value(), this);
   src.load_item();
   if (type == T_BOOLEAN || type == T_BYTE) {
     data.load_byte_item();
   } else {
     data.load_item();
   }
   off.load_item();
   set_no_result(x);
   if (x->is_volatile() && os::is_MP()) __ membar_release();
   put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile());
 }
 void LIRGenerator::do_UnsafePrefetch(UnsafePrefetch* x, bool is_store) {
   LIRItem src(x->object(), this);
   LIRItem off(x->offset(), this);
   src.load_item();
   if (off.is_constant() && can_inline_as_constant(x->offset())) {
     // let it be a constant
     off.dont_load_item();
   } else {
     off.load_item();
   }
   set_no_result(x);
   LIR_Address* addr = generate_address(src.result(), off.result(), 0, 0, T_BYTE);
   __ prefetch(addr, is_store);
 }
 void LIRGenerator::do_UnsafePrefetchRead(UnsafePrefetchRead* x) {
   do_UnsafePrefetch(x, false);
 }
 void LIRGenerator::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) {
   do_UnsafePrefetch(x, true);
 }
 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) {
   int lng = x->length();
   for (int i = 0; i < lng; i++) {
     SwitchRange* one_range = x->at(i);
     int low_key = one_range->low_key();
     int high_key = one_range->high_key();
     BlockBegin* dest = one_range->sux();
     if (low_key == high_key) {
       __ cmp(lir_cond_equal, value, low_key);
       __ branch(lir_cond_equal, T_INT, dest);
     } else if (high_key - low_key == 1) {
       __ cmp(lir_cond_equal, value, low_key);
       __ branch(lir_cond_equal, T_INT, dest);
       __ cmp(lir_cond_equal, value, high_key);
       __ branch(lir_cond_equal, T_INT, dest);
     } else {
       LabelObj* L = new LabelObj();
       __ cmp(lir_cond_less, value, low_key);
       __ branch(lir_cond_less, L->label());
       __ cmp(lir_cond_lessEqual, value, high_key);
       __ branch(lir_cond_lessEqual, T_INT, dest);
       __ branch_destination(L->label());
     }
   }
   __ jump(default_sux);
 }
 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) {
   SwitchRangeList* res = new SwitchRangeList();
   int len = x->length();
   if (len > 0) {
     BlockBegin* sux = x->sux_at(0);
     int key = x->lo_key();
     BlockBegin* default_sux = x->default_sux();
     SwitchRange* range = new SwitchRange(key, sux);
     for (int i = 0; i < len; i++, key++) {
       BlockBegin* new_sux = x->sux_at(i);
       if (sux == new_sux) {
         // still in same range
         range->set_high_key(key);
       } else {
         // skip tests which explicitly dispatch to the default
         if (sux != default_sux) {
           res->append(range);
         }
         range = new SwitchRange(key, new_sux);
       }
       sux = new_sux;
     }
     if (res->length() == 0 || res->last() != range)  res->append(range);
   }
   return res;
 }
 // we expect the keys to be sorted by increasing value
 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) {
   SwitchRangeList* res = new SwitchRangeList();
   int len = x->length();
   if (len > 0) {
     BlockBegin* default_sux = x->default_sux();
     int key = x->key_at(0);
     BlockBegin* sux = x->sux_at(0);
     SwitchRange* range = new SwitchRange(key, sux);
     for (int i = 1; i < len; i++) {
       int new_key = x->key_at(i);
       BlockBegin* new_sux = x->sux_at(i);
       if (key+1 == new_key && sux == new_sux) {
         // still in same range
         range->set_high_key(new_key);
       } else {
         // skip tests which explicitly dispatch to the default
         if (range->sux() != default_sux) {
           res->append(range);
         }
         range = new SwitchRange(new_key, new_sux);
       }
       key = new_key;
       sux = new_sux;
     }
     if (res->length() == 0 || res->last() != range)  res->append(range);
   }
   return res;
 }
 void LIRGenerator::do_TableSwitch(TableSwitch* x) {
   LIRItem tag(x->tag(), this);
   tag.load_item();
   set_no_result(x);
   if (x->is_safepoint()) {
     __ safepoint(safepoint_poll_register(), state_for(x, x->state_before()));
   }
   // move values into phi locations
   move_to_phi(x->state());
   int lo_key = x->lo_key();
   int hi_key = x->hi_key();
   int len = x->length();
   CodeEmitInfo* info = state_for(x, x->state());
   LIR_Opr value = tag.result();
   if (UseTableRanges) {
     do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux());
   } else {
     for (int i = 0; i < len; i++) {
       __ cmp(lir_cond_equal, value, i + lo_key);
       __ branch(lir_cond_equal, T_INT, x->sux_at(i));
     }
     __ jump(x->default_sux());
   }
 }
 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) {
   LIRItem tag(x->tag(), this);
   tag.load_item();
   set_no_result(x);
   if (x->is_safepoint()) {
     __ safepoint(safepoint_poll_register(), state_for(x, x->state_before()));
   }
   // move values into phi locations
   move_to_phi(x->state());
   LIR_Opr value = tag.result();
   if (UseTableRanges) {
     do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux());
   } else {
     int len = x->length();
     for (int i = 0; i < len; i++) {
       __ cmp(lir_cond_equal, value, x->key_at(i));
       __ branch(lir_cond_equal, T_INT, x->sux_at(i));
     }
     __ jump(x->default_sux());
   }
 }
 void LIRGenerator::do_Goto(Goto* x) {
   set_no_result(x);
   if (block()->next()->as_OsrEntry()) {
     // need to free up storage used for OSR entry point
     LIR_Opr osrBuffer = block()->next()->operand();
     BasicTypeList signature;
     signature.append(T_INT);
     CallingConvention* cc = frame_map()->c_calling_convention(&signature);
     __ move(osrBuffer, cc->args()->at(0));
     __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),
                          getThreadTemp(), LIR_OprFact::illegalOpr, cc->args());
   }
   if (x->is_safepoint()) {
     ValueStack* state = x->state_before() ? x->state_before() : x->state();
     // increment backedge counter if needed
     increment_backedge_counter(state_for(x, state));
     CodeEmitInfo* safepoint_info = state_for(x, state);
     __ safepoint(safepoint_poll_register(), safepoint_info);
   }
   // emit phi-instruction move after safepoint since this simplifies
   // describing the state as the safepoint.
   move_to_phi(x->state());
   __ jump(x->default_sux());
 }
 void LIRGenerator::do_Base(Base* x) {
   __ std_entry(LIR_OprFact::illegalOpr);
   // Emit moves from physical registers / stack slots to virtual registers
   CallingConvention* args = compilation()->frame_map()->incoming_arguments();
   IRScope* irScope = compilation()->hir()->top_scope();
   int java_index = 0;
   for (int i = 0; i < args->length(); i++) {
     LIR_Opr src = args->at(i);
     assert(!src->is_illegal(), "check");
     BasicType t = src->type();
     // Types which are smaller than int are passed as int, so
     // correct the type which passed.
     switch (t) {
     case T_BYTE:
     case T_BOOLEAN:
     case T_SHORT:
     case T_CHAR:
       t = T_INT;
       break;
     }
     LIR_Opr dest = new_register(t);
     __ move(src, dest);
     // Assign new location to Local instruction for this local
     Local* local = x->state()->local_at(java_index)->as_Local();
     assert(local != NULL, "Locals for incoming arguments must have been created");
     assert(as_ValueType(t)->tag() == local->type()->tag(), "check");
     local->set_operand(dest);
     _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL);
     java_index += type2size[t];
   }
   if (DTraceMethodProbes) {
     BasicTypeList signature;
     signature.append(T_INT);    // thread
     signature.append(T_OBJECT); // methodOop
     LIR_OprList* args = new LIR_OprList();
     args->append(getThreadPointer());
     LIR_Opr meth = new_register(T_OBJECT);
     __ oop2reg(method()->encoding(), meth);
     args->append(meth);
     call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL);
   }
   if (method()->is_synchronized()) {
     LIR_Opr obj;
     if (method()->is_static()) {
       obj = new_register(T_OBJECT);
       __ oop2reg(method()->holder()->java_mirror()->encoding(), obj);
     } else {
       Local* receiver = x->state()->local_at(0)->as_Local();
       assert(receiver != NULL, "must already exist");
       obj = receiver->operand();
     }
     assert(obj->is_valid(), "must be valid");
     if (method()->is_synchronized() && GenerateSynchronizationCode) {
       LIR_Opr lock = new_register(T_INT);
       __ load_stack_address_monitor(0, lock);
       CodeEmitInfo* info = new CodeEmitInfo(SynchronizationEntryBCI, scope()->start()->state(), NULL);
       CodeStub* slow_path = new MonitorEnterStub(obj, lock, info);
       // receiver is guaranteed non-NULL so don't need CodeEmitInfo
       __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL);
     }
   }
   // increment invocation counters if needed
   increment_invocation_counter(new CodeEmitInfo(0, scope()->start()->state(), NULL));
   // all blocks with a successor must end with an unconditional jump
   // to the successor even if they are consecutive
   __ jump(x->default_sux());
 }
 void LIRGenerator::do_OsrEntry(OsrEntry* x) {
   // construct our frame and model the production of incoming pointer
   // to the OSR buffer.
   __ osr_entry(LIR_Assembler::osrBufferPointer());
   LIR_Opr result = rlock_result(x);
   __ move(LIR_Assembler::osrBufferPointer(), result);
 }
 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) {
   int i = x->has_receiver() ? 1 : 0;
   for (; i < args->length(); i++) {
     LIRItem* param = args->at(i);
     LIR_Opr loc = arg_list->at(i);
     if (loc->is_register()) {
       param->load_item_force(loc);
     } else {
       LIR_Address* addr = loc->as_address_ptr();
       param->load_for_store(addr->type());
       if (addr->type() == T_LONG || addr->type() == T_DOUBLE) {
         __ unaligned_move(param->result(), addr);
       } else {
         __ move(param->result(), addr);
       }
     }
   }
   if (x->has_receiver()) {
     LIRItem* receiver = args->at(0);
     LIR_Opr loc = arg_list->at(0);
     if (loc->is_register()) {
       receiver->load_item_force(loc);
     } else {
       assert(loc->is_address(), "just checking");
       receiver->load_for_store(T_OBJECT);
       __ move(receiver->result(), loc);
     }
   }
 }
 // Visits all arguments, returns appropriate items without loading them
 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) {
   LIRItemList* argument_items = new LIRItemList();
   if (x->has_receiver()) {
     LIRItem* receiver = new LIRItem(x->receiver(), this);
     argument_items->append(receiver);
   }
   int idx = x->has_receiver() ? 1 : 0;
   for (int i = 0; i < x->number_of_arguments(); i++) {
     LIRItem* param = new LIRItem(x->argument_at(i), this);
     argument_items->append(param);
     idx += (param->type()->is_double_word() ? 2 : 1);
   }
   return argument_items;
 }
 // The invoke with receiver has following phases:
 //   a) traverse and load/lock receiver;
 //   b) traverse all arguments -> item-array (invoke_visit_argument)
 //   c) push receiver on stack
 //   d) load each of the items and push on stack
 //   e) unlock receiver
 //   f) move receiver into receiver-register %o0
 //   g) lock result registers and emit call operation
 //
 // Before issuing a call, we must spill-save all values on stack
 // that are in caller-save register. "spill-save" moves thos registers
 // either in a free callee-save register or spills them if no free
 // callee save register is available.
 //
 // The problem is where to invoke spill-save.
 // - if invoked between e) and f), we may lock callee save
 //   register in "spill-save" that destroys the receiver register
 //   before f) is executed
 // - if we rearange the f) to be earlier, by loading %o0, it
 //   may destroy a value on the stack that is currently in %o0
 //   and is waiting to be spilled
 // - if we keep the receiver locked while doing spill-save,
 //   we cannot spill it as it is spill-locked
 //
 void LIRGenerator::do_Invoke(Invoke* x) {
   CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true);
   LIR_OprList* arg_list = cc->args();
   LIRItemList* args = invoke_visit_arguments(x);
   LIR_Opr receiver = LIR_OprFact::illegalOpr;
   // setup result register
   LIR_Opr result_register = LIR_OprFact::illegalOpr;
   if (x->type() != voidType) {
     result_register = result_register_for(x->type());
   }
   CodeEmitInfo* info = state_for(x, x->state());
   invoke_load_arguments(x, args, arg_list);
   if (x->has_receiver()) {
     args->at(0)->load_item_force(LIR_Assembler::receiverOpr());
     receiver = args->at(0)->result();
   }
   // emit invoke code
   bool optimized = x->target_is_loaded() && x->target_is_final();
   assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match");
   switch (x->code()) {
     case Bytecodes::_invokestatic:
       __ call_static(x->target(), result_register,
                      SharedRuntime::get_resolve_static_call_stub(),
                      arg_list, info);
       break;
     case Bytecodes::_invokespecial:
     case Bytecodes::_invokevirtual:
     case Bytecodes::_invokeinterface:
       // for final target we still produce an inline cache, in order
       // to be able to call mixed mode
       if (x->code() == Bytecodes::_invokespecial || optimized) {
         __ call_opt_virtual(x->target(), receiver, result_register,
                             SharedRuntime::get_resolve_opt_virtual_call_stub(),
                             arg_list, info);
       } else if (x->vtable_index() < 0) {
         __ call_icvirtual(x->target(), receiver, result_register,
                           SharedRuntime::get_resolve_virtual_call_stub(),
                           arg_list, info);
       } else {
         int entry_offset = instanceKlass::vtable_start_offset() + x->vtable_index() * vtableEntry::size();
         int vtable_offset = entry_offset * wordSize + vtableEntry::method_offset_in_bytes();
         __ call_virtual(x->target(), receiver, result_register, vtable_offset, arg_list, info);
       }
       break;
     default:
       ShouldNotReachHere();
       break;
   }
   if (x->type()->is_float() || x->type()->is_double()) {
     // Force rounding of results from non-strictfp when in strictfp
     // scope (or when we don't know the strictness of the callee, to
     // be safe.)
     if (method()->is_strict()) {
       if (!x->target_is_loaded() || !x->target_is_strictfp()) {
         result_register = round_item(result_register);
       }
     }
   }
   if (result_register->is_valid()) {
     LIR_Opr result = rlock_result(x);
     __ move(result_register, result);
   }
 }
 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) {
   assert(x->number_of_arguments() == 1, "wrong type");
   LIRItem value       (x->argument_at(0), this);
   LIR_Opr reg = rlock_result(x);
   value.load_item();
   LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type()));
   __ move(tmp, reg);
 }
 // Code for  :  x->x() {x->cond()} x->y() ? x->tval() : x->fval()
 void LIRGenerator::do_IfOp(IfOp* x) {
 #ifdef ASSERT
   {
     ValueTag xtag = x->x()->type()->tag();
     ValueTag ttag = x->tval()->type()->tag();
     assert(xtag == intTag || xtag == objectTag, "cannot handle others");
     assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others");
     assert(ttag == x->fval()->type()->tag(), "cannot handle others");
   }
 #endif
   LIRItem left(x->x(), this);
   LIRItem right(x->y(), this);
   left.load_item();
   if (can_inline_as_constant(right.value())) {
     right.dont_load_item();
   } else {
     right.load_item();
   }
   LIRItem t_val(x->tval(), this);
   LIRItem f_val(x->fval(), this);
   t_val.dont_load_item();
   f_val.dont_load_item();
   LIR_Opr reg = rlock_result(x);
   __ cmp(lir_cond(x->cond()), left.result(), right.result());
   __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg);
 }
 void LIRGenerator::do_Intrinsic(Intrinsic* x) {
   switch (x->id()) {
   case vmIntrinsics::_intBitsToFloat      :
   case vmIntrinsics::_doubleToRawLongBits :
   case vmIntrinsics::_longBitsToDouble    :
   case vmIntrinsics::_floatToRawIntBits   : {
     do_FPIntrinsics(x);
     break;
   }
   case vmIntrinsics::_currentTimeMillis: {
     assert(x->number_of_arguments() == 0, "wrong type");
     LIR_Opr reg = result_register_for(x->type());
     __ call_runtime_leaf(CAST_FROM_FN_PTR(address, os::javaTimeMillis), getThreadTemp(),
                          reg, new LIR_OprList());
     LIR_Opr result = rlock_result(x);
     __ move(reg, result);
     break;
   }
   case vmIntrinsics::_nanoTime: {
     assert(x->number_of_arguments() == 0, "wrong type");
     LIR_Opr reg = result_register_for(x->type());
     __ call_runtime_leaf(CAST_FROM_FN_PTR(address, os::javaTimeNanos), getThreadTemp(),
                          reg, new LIR_OprList());
     LIR_Opr result = rlock_result(x);
     __ move(reg, result);
     break;
   }
   case vmIntrinsics::_Object_init:    do_RegisterFinalizer(x); break;
   case vmIntrinsics::_getClass:       do_getClass(x);      break;
   case vmIntrinsics::_currentThread:  do_currentThread(x); break;
   case vmIntrinsics::_dlog:           // fall through
   case vmIntrinsics::_dlog10:         // fall through
   case vmIntrinsics::_dabs:           // fall through
   case vmIntrinsics::_dsqrt:          // fall through
   case vmIntrinsics::_dtan:           // fall through
   case vmIntrinsics::_dsin :          // fall through
   case vmIntrinsics::_dcos :          do_MathIntrinsic(x); break;
   case vmIntrinsics::_arraycopy:      do_ArrayCopy(x);     break;
   // java.nio.Buffer.checkIndex
   case vmIntrinsics::_checkIndex:     do_NIOCheckIndex(x); break;
   case vmIntrinsics::_compareAndSwapObject:
     do_CompareAndSwap(x, objectType);
     break;
   case vmIntrinsics::_compareAndSwapInt:
     do_CompareAndSwap(x, intType);
     break;
   case vmIntrinsics::_compareAndSwapLong:
     do_CompareAndSwap(x, longType);
     break;
     // sun.misc.AtomicLongCSImpl.attemptUpdate
   case vmIntrinsics::_attemptUpdate:
     do_AttemptUpdate(x);
     break;
   default: ShouldNotReachHere(); break;
   }
 }
 void LIRGenerator::do_ProfileCall(ProfileCall* x) {
   // Need recv in a temporary register so it interferes with the other temporaries
   LIR_Opr recv = LIR_OprFact::illegalOpr;
   LIR_Opr mdo = new_register(T_OBJECT);
   LIR_Opr tmp = new_register(T_INT);
   if (x->recv() != NULL) {
     LIRItem value(x->recv(), this);
     value.load_item();
     recv = new_register(T_OBJECT);
     __ move(value.result(), recv);
   }
   __ profile_call(x->method(), x->bci_of_invoke(), mdo, recv, tmp, x->known_holder());
 }
 void LIRGenerator::do_ProfileCounter(ProfileCounter* x) {
   LIRItem mdo(x->mdo(), this);
   mdo.load_item();
   increment_counter(new LIR_Address(mdo.result(), x->offset(), T_INT), x->increment());
 }
 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) {
   LIRItemList args(1);
   LIRItem value(arg1, this);
   args.append(&value);
   BasicTypeList signature;
   signature.append(as_BasicType(arg1->type()));
   return call_runtime(&signature, &args, entry, result_type, info);
 }
 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) {
   LIRItemList args(2);
   LIRItem value1(arg1, this);
   LIRItem value2(arg2, this);
   args.append(&value1);
   args.append(&value2);
   BasicTypeList signature;
   signature.append(as_BasicType(arg1->type()));
   signature.append(as_BasicType(arg2->type()));
   return call_runtime(&signature, &args, entry, result_type, info);
 }
 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args,
                                    address entry, ValueType* result_type, CodeEmitInfo* info) {
   // get a result register
   LIR_Opr phys_reg = LIR_OprFact::illegalOpr;
   LIR_Opr result = LIR_OprFact::illegalOpr;
   if (result_type->tag() != voidTag) {
     result = new_register(result_type);
     phys_reg = result_register_for(result_type);
   }
   // move the arguments into the correct location
   CallingConvention* cc = frame_map()->c_calling_convention(signature);
   assert(cc->length() == args->length(), "argument mismatch");
   for (int i = 0; i < args->length(); i++) {
     LIR_Opr arg = args->at(i);
     LIR_Opr loc = cc->at(i);
     if (loc->is_register()) {
       __ move(arg, loc);
     } else {
       LIR_Address* addr = loc->as_address_ptr();
 //           if (!can_store_as_constant(arg)) {
 //             LIR_Opr tmp = new_register(arg->type());
 //             __ move(arg, tmp);
 //             arg = tmp;
 //           }
       if (addr->type() == T_LONG || addr->type() == T_DOUBLE) {
         __ unaligned_move(arg, addr);
       } else {
         __ move(arg, addr);
       }
     }
   }
   if (info) {
     __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info);
   } else {
     __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args());
   }
   if (result->is_valid()) {
     __ move(phys_reg, result);
   }
   return result;
 }
 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args,
                                    address entry, ValueType* result_type, CodeEmitInfo* info) {
   // get a result register
   LIR_Opr phys_reg = LIR_OprFact::illegalOpr;
   LIR_Opr result = LIR_OprFact::illegalOpr;
   if (result_type->tag() != voidTag) {
     result = new_register(result_type);
     phys_reg = result_register_for(result_type);
   }
   // move the arguments into the correct location
   CallingConvention* cc = frame_map()->c_calling_convention(signature);
   assert(cc->length() == args->length(), "argument mismatch");
   for (int i = 0; i < args->length(); i++) {
     LIRItem* arg = args->at(i);
     LIR_Opr loc = cc->at(i);
     if (loc->is_register()) {
       arg->load_item_force(loc);
     } else {
       LIR_Address* addr = loc->as_address_ptr();
       arg->load_for_store(addr->type());
       if (addr->type() == T_LONG || addr->type() == T_DOUBLE) {
         __ unaligned_move(arg->result(), addr);
       } else {
         __ move(arg->result(), addr);
       }
     }
   }
   if (info) {
     __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info);
   } else {
     __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args());
   }
   if (result->is_valid()) {
     __ move(phys_reg, result);
   }
   return result;
 }
 void LIRGenerator::increment_invocation_counter(CodeEmitInfo* info, bool backedge) {
 #ifdef TIERED
   if (_compilation->env()->comp_level() == CompLevel_fast_compile &&
       (method()->code_size() >= Tier1BytecodeLimit || backedge)) {
     int limit = InvocationCounter::Tier1InvocationLimit;
     int offset = in_bytes(methodOopDesc::invocation_counter_offset() +
                           InvocationCounter::counter_offset());
     if (backedge) {
       limit = InvocationCounter::Tier1BackEdgeLimit;
       offset = in_bytes(methodOopDesc::backedge_counter_offset() +
                         InvocationCounter::counter_offset());
     }
     LIR_Opr meth = new_register(T_OBJECT);
     __ oop2reg(method()->encoding(), meth);
     LIR_Opr result = increment_and_return_counter(meth, offset, InvocationCounter::count_increment);
     __ cmp(lir_cond_aboveEqual, result, LIR_OprFact::intConst(limit));
     CodeStub* overflow = new CounterOverflowStub(info, info->bci());
     __ branch(lir_cond_aboveEqual, T_INT, overflow);
     __ branch_destination(overflow->continuation());
   }
 #endif
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/c1/c1_LIRGenerator.cpp@0fbdb4381b99 (annotated)

src/share/vm/c1/c1_LIRGenerator.cpp