jdk8-mips64-public/hotspot: src/share/vm/opto/subnode.cpp@ae9241bbce4a (annotated)

src/share/vm/opto/subnode.cpp@ae9241bbce4a (annotated)

src/share/vm/opto/subnode.cpp

Wed, 11 Jul 2012 14:50:30 -0700

author: kvn
date: Wed, 11 Jul 2012 14:50:30 -0700
changeset 3910: ae9241bbce4a
parent 3834: 8f6ce6f1049b
child 4037: da91efe96a93
permissions: -rw-r--r--

7181658: CTW: assert(t->meet(t0) == t) failed: Not monotonic
Summary: Use uncast node equivalence checks in CmpUNode::sub.
Reviewed-by: kvn, twisti
Contributed-by: vladimir.x.ivanov@oracle.com

 /*
  * Copyright (c) 1997, 2010, 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.
  *
  */
 #include "precompiled.hpp"
 #include "compiler/compileLog.hpp"
 #include "memory/allocation.inline.hpp"
 #include "opto/addnode.hpp"
 #include "opto/callnode.hpp"
 #include "opto/cfgnode.hpp"
 #include "opto/connode.hpp"
 #include "opto/loopnode.hpp"
 #include "opto/matcher.hpp"
 #include "opto/mulnode.hpp"
 #include "opto/opcodes.hpp"
 #include "opto/phaseX.hpp"
 #include "opto/subnode.hpp"
 #include "runtime/sharedRuntime.hpp"
 // Portions of code courtesy of Clifford Click
 // Optimization - Graph Style
 #include "math.h"
 //=============================================================================
 //------------------------------Identity---------------------------------------
 // If right input is a constant 0, return the left input.
 Node *SubNode::Identity( PhaseTransform *phase ) {
   assert(in(1) != this, "Must already have called Value");
   assert(in(2) != this, "Must already have called Value");
   // Remove double negation
   const Type *zero = add_id();
   if( phase->type( in(1) )->higher_equal( zero ) &&
       in(2)->Opcode() == Opcode() &&
       phase->type( in(2)->in(1) )->higher_equal( zero ) ) {
     return in(2)->in(2);
   }
   // Convert "(X+Y) - Y" into X and "(X+Y) - X" into Y
   if( in(1)->Opcode() == Op_AddI ) {
     if( phase->eqv(in(1)->in(2),in(2)) )
       return in(1)->in(1);
     if (phase->eqv(in(1)->in(1),in(2)))
       return in(1)->in(2);
     // Also catch: "(X + Opaque2(Y)) - Y".  In this case, 'Y' is a loop-varying
     // trip counter and X is likely to be loop-invariant (that's how O2 Nodes
     // are originally used, although the optimizer sometimes jiggers things).
     // This folding through an O2 removes a loop-exit use of a loop-varying
     // value and generally lowers register pressure in and around the loop.
     if( in(1)->in(2)->Opcode() == Op_Opaque2 &&
         phase->eqv(in(1)->in(2)->in(1),in(2)) )
       return in(1)->in(1);
   }
   return ( phase->type( in(2) )->higher_equal( zero ) ) ? in(1) : this;
 }
 //------------------------------Value------------------------------------------
 // A subtract node differences it's two inputs.
 const Type *SubNode::Value( PhaseTransform *phase ) const {
   const Node* in1 = in(1);
   const Node* in2 = in(2);
   // Either input is TOP ==> the result is TOP
   const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
   if( t1 == Type::TOP ) return Type::TOP;
   const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
   if( t2 == Type::TOP ) return Type::TOP;
   // Not correct for SubFnode and AddFNode (must check for infinity)
   // Equal?  Subtract is zero
   if (in1->eqv_uncast(in2))  return add_id();
   // Either input is BOTTOM ==> the result is the local BOTTOM
   if( t1 == Type::BOTTOM || t2 == Type::BOTTOM )
     return bottom_type();
   return sub(t1,t2);            // Local flavor of type subtraction
 }
 //=============================================================================
 //------------------------------Helper function--------------------------------
 static bool ok_to_convert(Node* inc, Node* iv) {
     // Do not collapse (x+c0)-y if "+" is a loop increment, because the
     // "-" is loop invariant and collapsing extends the live-range of "x"
     // to overlap with the "+", forcing another register to be used in
     // the loop.
     // This test will be clearer with '&&' (apply DeMorgan's rule)
     // but I like the early cutouts that happen here.
     const PhiNode *phi;
     if( ( !inc->in(1)->is_Phi() ||
           !(phi=inc->in(1)->as_Phi()) ||
           phi->is_copy() ||
           !phi->region()->is_CountedLoop() ||
           inc != phi->region()->as_CountedLoop()->incr() )
        &&
         // Do not collapse (x+c0)-iv if "iv" is a loop induction variable,
         // because "x" maybe invariant.
         ( !iv->is_loop_iv() )
       ) {
       return true;
     } else {
       return false;
     }
 }
 //------------------------------Ideal------------------------------------------
 Node *SubINode::Ideal(PhaseGVN *phase, bool can_reshape){
   Node *in1 = in(1);
   Node *in2 = in(2);
   uint op1 = in1->Opcode();
   uint op2 = in2->Opcode();
 #ifdef ASSERT
   // Check for dead loop
   if( phase->eqv( in1, this ) || phase->eqv( in2, this ) ||
       ( op1 == Op_AddI || op1 == Op_SubI ) &&
       ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) ||
         phase->eqv( in1->in(1), in1  ) || phase->eqv( in1->in(2), in1 ) ) )
     assert(false, "dead loop in SubINode::Ideal");
 #endif
   const Type *t2 = phase->type( in2 );
   if( t2 == Type::TOP ) return NULL;
   // Convert "x-c0" into "x+ -c0".
   if( t2->base() == Type::Int ){        // Might be bottom or top...
     const TypeInt *i = t2->is_int();
     if( i->is_con() )
       return new (phase->C, 3) AddINode(in1, phase->intcon(-i->get_con()));
   }
   // Convert "(x+c0) - y" into (x-y) + c0"
   // Do not collapse (x+c0)-y if "+" is a loop increment or
   // if "y" is a loop induction variable.
   if( op1 == Op_AddI && ok_to_convert(in1, in2) ) {
     const Type *tadd = phase->type( in1->in(2) );
     if( tadd->singleton() && tadd != Type::TOP ) {
       Node *sub2 = phase->transform( new (phase->C, 3) SubINode( in1->in(1), in2 ));
       return new (phase->C, 3) AddINode( sub2, in1->in(2) );
     }
   }
   // Convert "x - (y+c0)" into "(x-y) - c0"
   // Need the same check as in above optimization but reversed.
   if (op2 == Op_AddI && ok_to_convert(in2, in1)) {
     Node* in21 = in2->in(1);
     Node* in22 = in2->in(2);
     const TypeInt* tcon = phase->type(in22)->isa_int();
     if (tcon != NULL && tcon->is_con()) {
       Node* sub2 = phase->transform( new (phase->C, 3) SubINode(in1, in21) );
       Node* neg_c0 = phase->intcon(- tcon->get_con());
       return new (phase->C, 3) AddINode(sub2, neg_c0);
     }
   }
   const Type *t1 = phase->type( in1 );
   if( t1 == Type::TOP ) return NULL;
 #ifdef ASSERT
   // Check for dead loop
   if( ( op2 == Op_AddI || op2 == Op_SubI ) &&
       ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) ||
         phase->eqv( in2->in(1), in2  ) || phase->eqv( in2->in(2), in2  ) ) )
     assert(false, "dead loop in SubINode::Ideal");
 #endif
   // Convert "x - (x+y)" into "-y"
   if( op2 == Op_AddI &&
       phase->eqv( in1, in2->in(1) ) )
     return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(2));
   // Convert "(x-y) - x" into "-y"
   if( op1 == Op_SubI &&
       phase->eqv( in1->in(1), in2 ) )
     return new (phase->C, 3) SubINode( phase->intcon(0),in1->in(2));
   // Convert "x - (y+x)" into "-y"
   if( op2 == Op_AddI &&
       phase->eqv( in1, in2->in(2) ) )
     return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(1));
   // Convert "0 - (x-y)" into "y-x"
   if( t1 == TypeInt::ZERO && op2 == Op_SubI )
     return new (phase->C, 3) SubINode( in2->in(2), in2->in(1) );
   // Convert "0 - (x+con)" into "-con-x"
   jint con;
   if( t1 == TypeInt::ZERO && op2 == Op_AddI &&
       (con = in2->in(2)->find_int_con(0)) != 0 )
     return new (phase->C, 3) SubINode( phase->intcon(-con), in2->in(1) );
   // Convert "(X+A) - (X+B)" into "A - B"
   if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(1) )
     return new (phase->C, 3) SubINode( in1->in(2), in2->in(2) );
   // Convert "(A+X) - (B+X)" into "A - B"
   if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) )
     return new (phase->C, 3) SubINode( in1->in(1), in2->in(1) );
   // Convert "(A+X) - (X+B)" into "A - B"
   if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(1) )
     return new (phase->C, 3) SubINode( in1->in(1), in2->in(2) );
   // Convert "(X+A) - (B+X)" into "A - B"
   if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(2) )
     return new (phase->C, 3) SubINode( in1->in(2), in2->in(1) );
   // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally
   // nicer to optimize than subtract.
   if( op2 == Op_SubI && in2->outcnt() == 1) {
     Node *add1 = phase->transform( new (phase->C, 3) AddINode( in1, in2->in(2) ) );
     return new (phase->C, 3) SubINode( add1, in2->in(1) );
   }
   return NULL;
 }
 //------------------------------sub--------------------------------------------
 // A subtract node differences it's two inputs.
 const Type *SubINode::sub( const Type *t1, const Type *t2 ) const {
   const TypeInt *r0 = t1->is_int(); // Handy access
   const TypeInt *r1 = t2->is_int();
   int32 lo = r0->_lo - r1->_hi;
   int32 hi = r0->_hi - r1->_lo;
   // We next check for 32-bit overflow.
   // If that happens, we just assume all integers are possible.
   if( (((r0->_lo ^ r1->_hi) >= 0) ||    // lo ends have same signs OR
        ((r0->_lo ^      lo) >= 0)) &&   // lo results have same signs AND
       (((r0->_hi ^ r1->_lo) >= 0) ||    // hi ends have same signs OR
        ((r0->_hi ^      hi) >= 0)) )    // hi results have same signs
     return TypeInt::make(lo,hi,MAX2(r0->_widen,r1->_widen));
   else                          // Overflow; assume all integers
     return TypeInt::INT;
 }
 //=============================================================================
 //------------------------------Ideal------------------------------------------
 Node *SubLNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   Node *in1 = in(1);
   Node *in2 = in(2);
   uint op1 = in1->Opcode();
   uint op2 = in2->Opcode();
 #ifdef ASSERT
   // Check for dead loop
   if( phase->eqv( in1, this ) || phase->eqv( in2, this ) ||
       ( op1 == Op_AddL || op1 == Op_SubL ) &&
       ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) ||
         phase->eqv( in1->in(1), in1  ) || phase->eqv( in1->in(2), in1  ) ) )
     assert(false, "dead loop in SubLNode::Ideal");
 #endif
   if( phase->type( in2 ) == Type::TOP ) return NULL;
   const TypeLong *i = phase->type( in2 )->isa_long();
   // Convert "x-c0" into "x+ -c0".
   if( i &&                      // Might be bottom or top...
       i->is_con() )
     return new (phase->C, 3) AddLNode(in1, phase->longcon(-i->get_con()));
   // Convert "(x+c0) - y" into (x-y) + c0"
   // Do not collapse (x+c0)-y if "+" is a loop increment or
   // if "y" is a loop induction variable.
   if( op1 == Op_AddL && ok_to_convert(in1, in2) ) {
     Node *in11 = in1->in(1);
     const Type *tadd = phase->type( in1->in(2) );
     if( tadd->singleton() && tadd != Type::TOP ) {
       Node *sub2 = phase->transform( new (phase->C, 3) SubLNode( in11, in2 ));
       return new (phase->C, 3) AddLNode( sub2, in1->in(2) );
     }
   }
   // Convert "x - (y+c0)" into "(x-y) - c0"
   // Need the same check as in above optimization but reversed.
   if (op2 == Op_AddL && ok_to_convert(in2, in1)) {
     Node* in21 = in2->in(1);
     Node* in22 = in2->in(2);
     const TypeLong* tcon = phase->type(in22)->isa_long();
     if (tcon != NULL && tcon->is_con()) {
       Node* sub2 = phase->transform( new (phase->C, 3) SubLNode(in1, in21) );
       Node* neg_c0 = phase->longcon(- tcon->get_con());
       return new (phase->C, 3) AddLNode(sub2, neg_c0);
     }
   }
   const Type *t1 = phase->type( in1 );
   if( t1 == Type::TOP ) return NULL;
 #ifdef ASSERT
   // Check for dead loop
   if( ( op2 == Op_AddL || op2 == Op_SubL ) &&
       ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) ||
         phase->eqv( in2->in(1), in2  ) || phase->eqv( in2->in(2), in2  ) ) )
     assert(false, "dead loop in SubLNode::Ideal");
 #endif
   // Convert "x - (x+y)" into "-y"
   if( op2 == Op_AddL &&
       phase->eqv( in1, in2->in(1) ) )
     return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO), in2->in(2));
   // Convert "x - (y+x)" into "-y"
   if( op2 == Op_AddL &&
       phase->eqv( in1, in2->in(2) ) )
     return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO),in2->in(1));
   // Convert "0 - (x-y)" into "y-x"
   if( phase->type( in1 ) == TypeLong::ZERO && op2 == Op_SubL )
     return new (phase->C, 3) SubLNode( in2->in(2), in2->in(1) );
   // Convert "(X+A) - (X+B)" into "A - B"
   if( op1 == Op_AddL && op2 == Op_AddL && in1->in(1) == in2->in(1) )
     return new (phase->C, 3) SubLNode( in1->in(2), in2->in(2) );
   // Convert "(A+X) - (B+X)" into "A - B"
   if( op1 == Op_AddL && op2 == Op_AddL && in1->in(2) == in2->in(2) )
     return new (phase->C, 3) SubLNode( in1->in(1), in2->in(1) );
   // Convert "A-(B-C)" into (A+C)-B"
   if( op2 == Op_SubL && in2->outcnt() == 1) {
     Node *add1 = phase->transform( new (phase->C, 3) AddLNode( in1, in2->in(2) ) );
     return new (phase->C, 3) SubLNode( add1, in2->in(1) );
   }
   return NULL;
 }
 //------------------------------sub--------------------------------------------
 // A subtract node differences it's two inputs.
 const Type *SubLNode::sub( const Type *t1, const Type *t2 ) const {
   const TypeLong *r0 = t1->is_long(); // Handy access
   const TypeLong *r1 = t2->is_long();
   jlong lo = r0->_lo - r1->_hi;
   jlong hi = r0->_hi - r1->_lo;
   // We next check for 32-bit overflow.
   // If that happens, we just assume all integers are possible.
   if( (((r0->_lo ^ r1->_hi) >= 0) ||    // lo ends have same signs OR
        ((r0->_lo ^      lo) >= 0)) &&   // lo results have same signs AND
       (((r0->_hi ^ r1->_lo) >= 0) ||    // hi ends have same signs OR
        ((r0->_hi ^      hi) >= 0)) )    // hi results have same signs
     return TypeLong::make(lo,hi,MAX2(r0->_widen,r1->_widen));
   else                          // Overflow; assume all integers
     return TypeLong::LONG;
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // A subtract node differences its two inputs.
 const Type *SubFPNode::Value( PhaseTransform *phase ) const {
   const Node* in1 = in(1);
   const Node* in2 = in(2);
   // Either input is TOP ==> the result is TOP
   const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
   if( t1 == Type::TOP ) return Type::TOP;
   const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
   if( t2 == Type::TOP ) return Type::TOP;
   // if both operands are infinity of same sign, the result is NaN; do
   // not replace with zero
   if( (t1->is_finite() && t2->is_finite()) ) {
     if( phase->eqv(in1, in2) ) return add_id();
   }
   // Either input is BOTTOM ==> the result is the local BOTTOM
   const Type *bot = bottom_type();
   if( (t1 == bot) || (t2 == bot) ||
       (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) )
     return bot;
   return sub(t1,t2);            // Local flavor of type subtraction
 }
 //=============================================================================
 //------------------------------Ideal------------------------------------------
 Node *SubFNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   const Type *t2 = phase->type( in(2) );
   // Convert "x-c0" into "x+ -c0".
   if( t2->base() == Type::FloatCon ) {  // Might be bottom or top...
     // return new (phase->C, 3) AddFNode(in(1), phase->makecon( TypeF::make(-t2->getf()) ) );
   }
   // Not associative because of boundary conditions (infinity)
   if( IdealizedNumerics && !phase->C->method()->is_strict() ) {
     // Convert "x - (x+y)" into "-y"
     if( in(2)->is_Add() &&
         phase->eqv(in(1),in(2)->in(1) ) )
       return new (phase->C, 3) SubFNode( phase->makecon(TypeF::ZERO),in(2)->in(2));
   }
   // Cannot replace 0.0-X with -X because a 'fsub' bytecode computes
   // 0.0-0.0 as +0.0, while a 'fneg' bytecode computes -0.0.
   //if( phase->type(in(1)) == TypeF::ZERO )
   //return new (phase->C, 2) NegFNode(in(2));
   return NULL;
 }
 //------------------------------sub--------------------------------------------
 // A subtract node differences its two inputs.
 const Type *SubFNode::sub( const Type *t1, const Type *t2 ) const {
   // no folding if one of operands is infinity or NaN, do not do constant folding
   if( g_isfinite(t1->getf()) && g_isfinite(t2->getf()) ) {
     return TypeF::make( t1->getf() - t2->getf() );
   }
   else if( g_isnan(t1->getf()) ) {
     return t1;
   }
   else if( g_isnan(t2->getf()) ) {
     return t2;
   }
   else {
     return Type::FLOAT;
   }
 }
 //=============================================================================
 //------------------------------Ideal------------------------------------------
 Node *SubDNode::Ideal(PhaseGVN *phase, bool can_reshape){
   const Type *t2 = phase->type( in(2) );
   // Convert "x-c0" into "x+ -c0".
   if( t2->base() == Type::DoubleCon ) { // Might be bottom or top...
     // return new (phase->C, 3) AddDNode(in(1), phase->makecon( TypeD::make(-t2->getd()) ) );
   }
   // Not associative because of boundary conditions (infinity)
   if( IdealizedNumerics && !phase->C->method()->is_strict() ) {
     // Convert "x - (x+y)" into "-y"
     if( in(2)->is_Add() &&
         phase->eqv(in(1),in(2)->in(1) ) )
       return new (phase->C, 3) SubDNode( phase->makecon(TypeD::ZERO),in(2)->in(2));
   }
   // Cannot replace 0.0-X with -X because a 'dsub' bytecode computes
   // 0.0-0.0 as +0.0, while a 'dneg' bytecode computes -0.0.
   //if( phase->type(in(1)) == TypeD::ZERO )
   //return new (phase->C, 2) NegDNode(in(2));
   return NULL;
 }
 //------------------------------sub--------------------------------------------
 // A subtract node differences its two inputs.
 const Type *SubDNode::sub( const Type *t1, const Type *t2 ) const {
   // no folding if one of operands is infinity or NaN, do not do constant folding
   if( g_isfinite(t1->getd()) && g_isfinite(t2->getd()) ) {
     return TypeD::make( t1->getd() - t2->getd() );
   }
   else if( g_isnan(t1->getd()) ) {
     return t1;
   }
   else if( g_isnan(t2->getd()) ) {
     return t2;
   }
   else {
     return Type::DOUBLE;
   }
 }
 //=============================================================================
 //------------------------------Idealize---------------------------------------
 // Unlike SubNodes, compare must still flatten return value to the
 // range -1, 0, 1.
 // And optimizations like those for (X + Y) - X fail if overflow happens.
 Node *CmpNode::Identity( PhaseTransform *phase ) {
   return this;
 }
 //=============================================================================
 //------------------------------cmp--------------------------------------------
 // Simplify a CmpI (compare 2 integers) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpINode::sub( const Type *t1, const Type *t2 ) const {
   const TypeInt *r0 = t1->is_int(); // Handy access
   const TypeInt *r1 = t2->is_int();
   if( r0->_hi < r1->_lo )       // Range is always low?
     return TypeInt::CC_LT;
   else if( r0->_lo > r1->_hi )  // Range is always high?
     return TypeInt::CC_GT;
   else if( r0->is_con() && r1->is_con() ) { // comparing constants?
     assert(r0->get_con() == r1->get_con(), "must be equal");
     return TypeInt::CC_EQ;      // Equal results.
   } else if( r0->_hi == r1->_lo ) // Range is never high?
     return TypeInt::CC_LE;
   else if( r0->_lo == r1->_hi ) // Range is never low?
     return TypeInt::CC_GE;
   return TypeInt::CC;           // else use worst case results
 }
 // Simplify a CmpU (compare 2 integers) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpUNode::sub( const Type *t1, const Type *t2 ) const {
   assert(!t1->isa_ptr(), "obsolete usage of CmpU");
   // comparing two unsigned ints
   const TypeInt *r0 = t1->is_int();   // Handy access
   const TypeInt *r1 = t2->is_int();
   // Current installed version
   // Compare ranges for non-overlap
   juint lo0 = r0->_lo;
   juint hi0 = r0->_hi;
   juint lo1 = r1->_lo;
   juint hi1 = r1->_hi;
   // If either one has both negative and positive values,
   // it therefore contains both 0 and -1, and since [0..-1] is the
   // full unsigned range, the type must act as an unsigned bottom.
   bool bot0 = ((jint)(lo0 ^ hi0) < 0);
   bool bot1 = ((jint)(lo1 ^ hi1) < 0);
   if (bot0 || bot1) {
     // All unsigned values are LE -1 and GE 0.
     if (lo0 == 0 && hi0 == 0) {
       return TypeInt::CC_LE;            //   0 <= bot
     } else if (lo1 == 0 && hi1 == 0) {
       return TypeInt::CC_GE;            // bot >= 0
     }
   } else {
     // We can use ranges of the form [lo..hi] if signs are the same.
     assert(lo0 <= hi0 && lo1 <= hi1, "unsigned ranges are valid");
     // results are reversed, '-' > '+' for unsigned compare
     if (hi0 < lo1) {
       return TypeInt::CC_LT;            // smaller
     } else if (lo0 > hi1) {
       return TypeInt::CC_GT;            // greater
     } else if (hi0 == lo1 && lo0 == hi1) {
       return TypeInt::CC_EQ;            // Equal results
     } else if (lo0 >= hi1) {
       return TypeInt::CC_GE;
     } else if (hi0 <= lo1) {
       // Check for special case in Hashtable::get.  (See below.)
       if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && is_index_range_check())
         return TypeInt::CC_LT;
       return TypeInt::CC_LE;
     }
   }
   // Check for special case in Hashtable::get - the hash index is
   // mod'ed to the table size so the following range check is useless.
   // Check for: (X Mod Y) CmpU Y, where the mod result and Y both have
   // to be positive.
   // (This is a gross hack, since the sub method never
   // looks at the structure of the node in any other case.)
   if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && is_index_range_check())
     return TypeInt::CC_LT;
   return TypeInt::CC;                   // else use worst case results
 }
 bool CmpUNode::is_index_range_check() const {
   // Check for the "(X ModI Y) CmpU Y" shape
   return (in(1)->Opcode() == Op_ModI &&
           in(1)->in(2)->eqv_uncast(in(2)));
 }
 //------------------------------Idealize---------------------------------------
 Node *CmpINode::Ideal( PhaseGVN *phase, bool can_reshape ) {
   if (phase->type(in(2))->higher_equal(TypeInt::ZERO)) {
     switch (in(1)->Opcode()) {
     case Op_CmpL3:              // Collapse a CmpL3/CmpI into a CmpL
       return new (phase->C, 3) CmpLNode(in(1)->in(1),in(1)->in(2));
     case Op_CmpF3:              // Collapse a CmpF3/CmpI into a CmpF
       return new (phase->C, 3) CmpFNode(in(1)->in(1),in(1)->in(2));
     case Op_CmpD3:              // Collapse a CmpD3/CmpI into a CmpD
       return new (phase->C, 3) CmpDNode(in(1)->in(1),in(1)->in(2));
     //case Op_SubI:
       // If (x - y) cannot overflow, then ((x - y) <?> 0)
       // can be turned into (x <?> y).
       // This is handled (with more general cases) by Ideal_sub_algebra.
     }
   }
   return NULL;                  // No change
 }
 //=============================================================================
 // Simplify a CmpL (compare 2 longs ) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpLNode::sub( const Type *t1, const Type *t2 ) const {
   const TypeLong *r0 = t1->is_long(); // Handy access
   const TypeLong *r1 = t2->is_long();
   if( r0->_hi < r1->_lo )       // Range is always low?
     return TypeInt::CC_LT;
   else if( r0->_lo > r1->_hi )  // Range is always high?
     return TypeInt::CC_GT;
   else if( r0->is_con() && r1->is_con() ) { // comparing constants?
     assert(r0->get_con() == r1->get_con(), "must be equal");
     return TypeInt::CC_EQ;      // Equal results.
   } else if( r0->_hi == r1->_lo ) // Range is never high?
     return TypeInt::CC_LE;
   else if( r0->_lo == r1->_hi ) // Range is never low?
     return TypeInt::CC_GE;
   return TypeInt::CC;           // else use worst case results
 }
 //=============================================================================
 //------------------------------sub--------------------------------------------
 // Simplify an CmpP (compare 2 pointers) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpPNode::sub( const Type *t1, const Type *t2 ) const {
   const TypePtr *r0 = t1->is_ptr(); // Handy access
   const TypePtr *r1 = t2->is_ptr();
   // Undefined inputs makes for an undefined result
   if( TypePtr::above_centerline(r0->_ptr) ||
       TypePtr::above_centerline(r1->_ptr) )
     return Type::TOP;
   if (r0 == r1 && r0->singleton()) {
     // Equal pointer constants (klasses, nulls, etc.)
     return TypeInt::CC_EQ;
   }
   // See if it is 2 unrelated classes.
   const TypeOopPtr* p0 = r0->isa_oopptr();
   const TypeOopPtr* p1 = r1->isa_oopptr();
   if (p0 && p1) {
     Node* in1 = in(1)->uncast();
     Node* in2 = in(2)->uncast();
     AllocateNode* alloc1 = AllocateNode::Ideal_allocation(in1, NULL);
     AllocateNode* alloc2 = AllocateNode::Ideal_allocation(in2, NULL);
     if (MemNode::detect_ptr_independence(in1, alloc1, in2, alloc2, NULL)) {
       return TypeInt::CC_GT;  // different pointers
     }
     ciKlass* klass0 = p0->klass();
     bool    xklass0 = p0->klass_is_exact();
     ciKlass* klass1 = p1->klass();
     bool    xklass1 = p1->klass_is_exact();
     int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0);
     if (klass0 && klass1 &&
         kps != 1 &&             // both or neither are klass pointers
         klass0->is_loaded() && !klass0->is_interface() && // do not trust interfaces
         klass1->is_loaded() && !klass1->is_interface() &&
         (!klass0->is_obj_array_klass() ||
          !klass0->as_obj_array_klass()->base_element_klass()->is_interface()) &&
         (!klass1->is_obj_array_klass() ||
          !klass1->as_obj_array_klass()->base_element_klass()->is_interface())) {
       bool unrelated_classes = false;
       // See if neither subclasses the other, or if the class on top
       // is precise.  In either of these cases, the compare is known
       // to fail if at least one of the pointers is provably not null.
       if (klass0->equals(klass1)   ||   // if types are unequal but klasses are
           !klass0->is_java_klass() ||   // types not part of Java language?
           !klass1->is_java_klass()) {   // types not part of Java language?
         // Do nothing; we know nothing for imprecise types
       } else if (klass0->is_subtype_of(klass1)) {
         // If klass1's type is PRECISE, then classes are unrelated.
         unrelated_classes = xklass1;
       } else if (klass1->is_subtype_of(klass0)) {
         // If klass0's type is PRECISE, then classes are unrelated.
         unrelated_classes = xklass0;
       } else {                  // Neither subtypes the other
         unrelated_classes = true;
       }
       if (unrelated_classes) {
         // The oops classes are known to be unrelated. If the joined PTRs of
         // two oops is not Null and not Bottom, then we are sure that one
         // of the two oops is non-null, and the comparison will always fail.
         TypePtr::PTR jp = r0->join_ptr(r1->_ptr);
         if (jp != TypePtr::Null && jp != TypePtr::BotPTR) {
           return TypeInt::CC_GT;
         }
       }
     }
   }
   // Known constants can be compared exactly
   // Null can be distinguished from any NotNull pointers
   // Unknown inputs makes an unknown result
   if( r0->singleton() ) {
     intptr_t bits0 = r0->get_con();
     if( r1->singleton() )
       return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
     return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
   } else if( r1->singleton() ) {
     intptr_t bits1 = r1->get_con();
     return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
   } else
     return TypeInt::CC;
 }
 static inline Node* isa_java_mirror_load(PhaseGVN* phase, Node* n) {
   // Return the klass node for
   //   LoadP(AddP(foo:Klass, #java_mirror))
   //   or NULL if not matching.
   if (n->Opcode() != Op_LoadP) return NULL;
   const TypeInstPtr* tp = phase->type(n)->isa_instptr();
   if (!tp || tp->klass() != phase->C->env()->Class_klass()) return NULL;
   Node* adr = n->in(MemNode::Address);
   intptr_t off = 0;
   Node* k = AddPNode::Ideal_base_and_offset(adr, phase, off);
   if (k == NULL)  return NULL;
   const TypeKlassPtr* tkp = phase->type(k)->isa_klassptr();
   if (!tkp || off != in_bytes(Klass::java_mirror_offset())) return NULL;
   // We've found the klass node of a Java mirror load.
   return k;
 }
 static inline Node* isa_const_java_mirror(PhaseGVN* phase, Node* n) {
   // for ConP(Foo.class) return ConP(Foo.klass)
   // otherwise return NULL
   if (!n->is_Con()) return NULL;
   const TypeInstPtr* tp = phase->type(n)->isa_instptr();
   if (!tp) return NULL;
   ciType* mirror_type = tp->java_mirror_type();
   // TypeInstPtr::java_mirror_type() returns non-NULL for compile-
   // time Class constants only.
   if (!mirror_type) return NULL;
   // x.getClass() == int.class can never be true (for all primitive types)
   // Return a ConP(NULL) node for this case.
   if (mirror_type->is_classless()) {
     return phase->makecon(TypePtr::NULL_PTR);
   }
   // return the ConP(Foo.klass)
   assert(mirror_type->is_klass(), "mirror_type should represent a klassOop");
   return phase->makecon(TypeKlassPtr::make(mirror_type->as_klass()));
 }
 //------------------------------Ideal------------------------------------------
 // Normalize comparisons between Java mirror loads to compare the klass instead.
 //
 // Also check for the case of comparing an unknown klass loaded from the primary
 // super-type array vs a known klass with no subtypes.  This amounts to
 // checking to see an unknown klass subtypes a known klass with no subtypes;
 // this only happens on an exact match.  We can shorten this test by 1 load.
 Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) {
   // Normalize comparisons between Java mirrors into comparisons of the low-
   // level klass, where a dependent load could be shortened.
   //
   // The new pattern has a nice effect of matching the same pattern used in the
   // fast path of instanceof/checkcast/Class.isInstance(), which allows
   // redundant exact type check be optimized away by GVN.
   // For example, in
   //   if (x.getClass() == Foo.class) {
   //     Foo foo = (Foo) x;
   //     // ... use a ...
   //   }
   // a CmpPNode could be shared between if_acmpne and checkcast
   {
     Node* k1 = isa_java_mirror_load(phase, in(1));
     Node* k2 = isa_java_mirror_load(phase, in(2));
     Node* conk2 = isa_const_java_mirror(phase, in(2));
     if (k1 && (k2 || conk2)) {
       Node* lhs = k1;
       Node* rhs = (k2 != NULL) ? k2 : conk2;
       this->set_req(1, lhs);
       this->set_req(2, rhs);
       return this;
     }
   }
   // Constant pointer on right?
   const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
   if (t2 == NULL || !t2->klass_is_exact())
     return NULL;
   // Get the constant klass we are comparing to.
   ciKlass* superklass = t2->klass();
   // Now check for LoadKlass on left.
   Node* ldk1 = in(1);
   if (ldk1->is_DecodeN()) {
     ldk1 = ldk1->in(1);
     if (ldk1->Opcode() != Op_LoadNKlass )
       return NULL;
   } else if (ldk1->Opcode() != Op_LoadKlass )
     return NULL;
   // Take apart the address of the LoadKlass:
   Node* adr1 = ldk1->in(MemNode::Address);
   intptr_t con2 = 0;
   Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
   if (ldk2 == NULL)
     return NULL;
   if (con2 == oopDesc::klass_offset_in_bytes()) {
     // We are inspecting an object's concrete class.
     // Short-circuit the check if the query is abstract.
     if (superklass->is_interface() ||
         superklass->is_abstract()) {
       // Make it come out always false:
       this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
       return this;
     }
   }
   // Check for a LoadKlass from primary supertype array.
   // Any nested loadklass from loadklass+con must be from the p.s. array.
   if (ldk2->is_DecodeN()) {
     // Keep ldk2 as DecodeN since it could be used in CmpP below.
     if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
       return NULL;
   } else if (ldk2->Opcode() != Op_LoadKlass)
     return NULL;
   // Verify that we understand the situation
   if (con2 != (intptr_t) superklass->super_check_offset())
     return NULL;                // Might be element-klass loading from array klass
   // If 'superklass' has no subklasses and is not an interface, then we are
   // assured that the only input which will pass the type check is
   // 'superklass' itself.
   //
   // We could be more liberal here, and allow the optimization on interfaces
   // which have a single implementor.  This would require us to increase the
   // expressiveness of the add_dependency() mechanism.
   // %%% Do this after we fix TypeOopPtr:  Deps are expressive enough now.
   // Object arrays must have their base element have no subtypes
   while (superklass->is_obj_array_klass()) {
     ciType* elem = superklass->as_obj_array_klass()->element_type();
     superklass = elem->as_klass();
   }
   if (superklass->is_instance_klass()) {
     ciInstanceKlass* ik = superklass->as_instance_klass();
     if (ik->has_subklass() || ik->is_interface())  return NULL;
     // Add a dependency if there is a chance that a subclass will be added later.
     if (!ik->is_final()) {
       phase->C->dependencies()->assert_leaf_type(ik);
     }
   }
   // Bypass the dependent load, and compare directly
   this->set_req(1,ldk2);
   return this;
 }
 //=============================================================================
 //------------------------------sub--------------------------------------------
 // Simplify an CmpN (compare 2 pointers) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpNNode::sub( const Type *t1, const Type *t2 ) const {
   const TypePtr *r0 = t1->make_ptr(); // Handy access
   const TypePtr *r1 = t2->make_ptr();
   // Undefined inputs makes for an undefined result
   if( TypePtr::above_centerline(r0->_ptr) ||
       TypePtr::above_centerline(r1->_ptr) )
     return Type::TOP;
   if (r0 == r1 && r0->singleton()) {
     // Equal pointer constants (klasses, nulls, etc.)
     return TypeInt::CC_EQ;
   }
   // See if it is 2 unrelated classes.
   const TypeOopPtr* p0 = r0->isa_oopptr();
   const TypeOopPtr* p1 = r1->isa_oopptr();
   if (p0 && p1) {
     ciKlass* klass0 = p0->klass();
     bool    xklass0 = p0->klass_is_exact();
     ciKlass* klass1 = p1->klass();
     bool    xklass1 = p1->klass_is_exact();
     int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0);
     if (klass0 && klass1 &&
         kps != 1 &&             // both or neither are klass pointers
         !klass0->is_interface() && // do not trust interfaces
         !klass1->is_interface()) {
       bool unrelated_classes = false;
       // See if neither subclasses the other, or if the class on top
       // is precise.  In either of these cases, the compare is known
       // to fail if at least one of the pointers is provably not null.
       if (klass0->equals(klass1)   ||   // if types are unequal but klasses are
           !klass0->is_java_klass() ||   // types not part of Java language?
           !klass1->is_java_klass()) {   // types not part of Java language?
         // Do nothing; we know nothing for imprecise types
       } else if (klass0->is_subtype_of(klass1)) {
         // If klass1's type is PRECISE, then classes are unrelated.
         unrelated_classes = xklass1;
       } else if (klass1->is_subtype_of(klass0)) {
         // If klass0's type is PRECISE, then classes are unrelated.
         unrelated_classes = xklass0;
       } else {                  // Neither subtypes the other
         unrelated_classes = true;
       }
       if (unrelated_classes) {
         // The oops classes are known to be unrelated. If the joined PTRs of
         // two oops is not Null and not Bottom, then we are sure that one
         // of the two oops is non-null, and the comparison will always fail.
         TypePtr::PTR jp = r0->join_ptr(r1->_ptr);
         if (jp != TypePtr::Null && jp != TypePtr::BotPTR) {
           return TypeInt::CC_GT;
         }
       }
     }
   }
   // Known constants can be compared exactly
   // Null can be distinguished from any NotNull pointers
   // Unknown inputs makes an unknown result
   if( r0->singleton() ) {
     intptr_t bits0 = r0->get_con();
     if( r1->singleton() )
       return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
     return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
   } else if( r1->singleton() ) {
     intptr_t bits1 = r1->get_con();
     return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
   } else
     return TypeInt::CC;
 }
 //------------------------------Ideal------------------------------------------
 Node *CmpNNode::Ideal( PhaseGVN *phase, bool can_reshape ) {
   return NULL;
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Simplify an CmpF (compare 2 floats ) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpFNode::Value( PhaseTransform *phase ) const {
   const Node* in1 = in(1);
   const Node* in2 = in(2);
   // Either input is TOP ==> the result is TOP
   const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
   if( t1 == Type::TOP ) return Type::TOP;
   const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
   if( t2 == Type::TOP ) return Type::TOP;
   // Not constants?  Don't know squat - even if they are the same
   // value!  If they are NaN's they compare to LT instead of EQ.
   const TypeF *tf1 = t1->isa_float_constant();
   const TypeF *tf2 = t2->isa_float_constant();
   if( !tf1 || !tf2 ) return TypeInt::CC;
   // This implements the Java bytecode fcmpl, so unordered returns -1.
   if( tf1->is_nan() || tf2->is_nan() )
     return TypeInt::CC_LT;
   if( tf1->_f < tf2->_f ) return TypeInt::CC_LT;
   if( tf1->_f > tf2->_f ) return TypeInt::CC_GT;
   assert( tf1->_f == tf2->_f, "do not understand FP behavior" );
   return TypeInt::CC_EQ;
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Simplify an CmpD (compare 2 doubles ) node, based on local information.
 // If both inputs are constants, compare them.
 const Type *CmpDNode::Value( PhaseTransform *phase ) const {
   const Node* in1 = in(1);
   const Node* in2 = in(2);
   // Either input is TOP ==> the result is TOP
   const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
   if( t1 == Type::TOP ) return Type::TOP;
   const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
   if( t2 == Type::TOP ) return Type::TOP;
   // Not constants?  Don't know squat - even if they are the same
   // value!  If they are NaN's they compare to LT instead of EQ.
   const TypeD *td1 = t1->isa_double_constant();
   const TypeD *td2 = t2->isa_double_constant();
   if( !td1 || !td2 ) return TypeInt::CC;
   // This implements the Java bytecode dcmpl, so unordered returns -1.
   if( td1->is_nan() || td2->is_nan() )
     return TypeInt::CC_LT;
   if( td1->_d < td2->_d ) return TypeInt::CC_LT;
   if( td1->_d > td2->_d ) return TypeInt::CC_GT;
   assert( td1->_d == td2->_d, "do not understand FP behavior" );
   return TypeInt::CC_EQ;
 }
 //------------------------------Ideal------------------------------------------
 Node *CmpDNode::Ideal(PhaseGVN *phase, bool can_reshape){
   // Check if we can change this to a CmpF and remove a ConvD2F operation.
   // Change  (CMPD (F2D (float)) (ConD value))
   // To      (CMPF      (float)  (ConF value))
   // Valid when 'value' does not lose precision as a float.
   // Benefits: eliminates conversion, does not require 24-bit mode
   // NaNs prevent commuting operands.  This transform works regardless of the
   // order of ConD and ConvF2D inputs by preserving the original order.
   int idx_f2d = 1;              // ConvF2D on left side?
   if( in(idx_f2d)->Opcode() != Op_ConvF2D )
     idx_f2d = 2;                // No, swap to check for reversed args
   int idx_con = 3-idx_f2d;      // Check for the constant on other input
   if( ConvertCmpD2CmpF &&
       in(idx_f2d)->Opcode() == Op_ConvF2D &&
       in(idx_con)->Opcode() == Op_ConD ) {
     const TypeD *t2 = in(idx_con)->bottom_type()->is_double_constant();
     double t2_value_as_double = t2->_d;
     float  t2_value_as_float  = (float)t2_value_as_double;
     if( t2_value_as_double == (double)t2_value_as_float ) {
       // Test value can be represented as a float
       // Eliminate the conversion to double and create new comparison
       Node *new_in1 = in(idx_f2d)->in(1);
       Node *new_in2 = phase->makecon( TypeF::make(t2_value_as_float) );
       if( idx_f2d != 1 ) {      // Must flip args to match original order
         Node *tmp = new_in1;
         new_in1 = new_in2;
         new_in2 = tmp;
       }
       CmpFNode *new_cmp = (Opcode() == Op_CmpD3)
         ? new (phase->C, 3) CmpF3Node( new_in1, new_in2 )
         : new (phase->C, 3) CmpFNode ( new_in1, new_in2 ) ;
       return new_cmp;           // Changed to CmpFNode
     }
     // Testing value required the precision of a double
   }
   return NULL;                  // No change
 }
 //=============================================================================
 //------------------------------cc2logical-------------------------------------
 // Convert a condition code type to a logical type
 const Type *BoolTest::cc2logical( const Type *CC ) const {
   if( CC == Type::TOP ) return Type::TOP;
   if( CC->base() != Type::Int ) return TypeInt::BOOL; // Bottom or worse
   const TypeInt *ti = CC->is_int();
   if( ti->is_con() ) {          // Only 1 kind of condition codes set?
     // Match low order 2 bits
     int tmp = ((ti->get_con()&3) == (_test&3)) ? 1 : 0;
     if( _test & 4 ) tmp = 1-tmp;     // Optionally complement result
     return TypeInt::make(tmp);       // Boolean result
   }
   if( CC == TypeInt::CC_GE ) {
     if( _test == ge ) return TypeInt::ONE;
     if( _test == lt ) return TypeInt::ZERO;
   }
   if( CC == TypeInt::CC_LE ) {
     if( _test == le ) return TypeInt::ONE;
     if( _test == gt ) return TypeInt::ZERO;
   }
   return TypeInt::BOOL;
 }
 //------------------------------dump_spec-------------------------------------
 // Print special per-node info
 #ifndef PRODUCT
 void BoolTest::dump_on(outputStream *st) const {
   const char *msg[] = {"eq","gt","??","lt","ne","le","??","ge"};
   st->print(msg[_test]);
 }
 #endif
 //=============================================================================
 uint BoolNode::hash() const { return (Node::hash() << 3)|(_test._test+1); }
 uint BoolNode::size_of() const { return sizeof(BoolNode); }
 //------------------------------operator==-------------------------------------
 uint BoolNode::cmp( const Node &n ) const {
   const BoolNode *b = (const BoolNode *)&n; // Cast up
   return (_test._test == b->_test._test);
 }
 //------------------------------clone_cmp--------------------------------------
 // Clone a compare/bool tree
 static Node *clone_cmp( Node *cmp, Node *cmp1, Node *cmp2, PhaseGVN *gvn, BoolTest::mask test ) {
   Node *ncmp = cmp->clone();
   ncmp->set_req(1,cmp1);
   ncmp->set_req(2,cmp2);
   ncmp = gvn->transform( ncmp );
   return new (gvn->C, 2) BoolNode( ncmp, test );
 }
 //-------------------------------make_predicate--------------------------------
 Node* BoolNode::make_predicate(Node* test_value, PhaseGVN* phase) {
   if (test_value->is_Con())   return test_value;
   if (test_value->is_Bool())  return test_value;
   Compile* C = phase->C;
   if (test_value->is_CMove() &&
       test_value->in(CMoveNode::Condition)->is_Bool()) {
     BoolNode*   bol   = test_value->in(CMoveNode::Condition)->as_Bool();
     const Type* ftype = phase->type(test_value->in(CMoveNode::IfFalse));
     const Type* ttype = phase->type(test_value->in(CMoveNode::IfTrue));
     if (ftype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ttype)) {
       return bol;
     } else if (ttype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ftype)) {
       return phase->transform( bol->negate(phase) );
     }
     // Else fall through.  The CMove gets in the way of the test.
     // It should be the case that make_predicate(bol->as_int_value()) == bol.
   }
   Node* cmp = new (C, 3) CmpINode(test_value, phase->intcon(0));
   cmp = phase->transform(cmp);
   Node* bol = new (C, 2) BoolNode(cmp, BoolTest::ne);
   return phase->transform(bol);
 }
 //--------------------------------as_int_value---------------------------------
 Node* BoolNode::as_int_value(PhaseGVN* phase) {
   // Inverse to make_predicate.  The CMove probably boils down to a Conv2B.
   Node* cmov = CMoveNode::make(phase->C, NULL, this,
                                phase->intcon(0), phase->intcon(1),
                                TypeInt::BOOL);
   return phase->transform(cmov);
 }
 //----------------------------------negate-------------------------------------
 BoolNode* BoolNode::negate(PhaseGVN* phase) {
   Compile* C = phase->C;
   return new (C, 2) BoolNode(in(1), _test.negate());
 }
 //------------------------------Ideal------------------------------------------
 Node *BoolNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)".
   // This moves the constant to the right.  Helps value-numbering.
   Node *cmp = in(1);
   if( !cmp->is_Sub() ) return NULL;
   int cop = cmp->Opcode();
   if( cop == Op_FastLock || cop == Op_FastUnlock ) return NULL;
   Node *cmp1 = cmp->in(1);
   Node *cmp2 = cmp->in(2);
   if( !cmp1 ) return NULL;
   // Constant on left?
   Node *con = cmp1;
   uint op2 = cmp2->Opcode();
   // Move constants to the right of compare's to canonicalize.
   // Do not muck with Opaque1 nodes, as this indicates a loop
   // guard that cannot change shape.
   if( con->is_Con() && !cmp2->is_Con() && op2 != Op_Opaque1 &&
       // Because of NaN's, CmpD and CmpF are not commutative
       cop != Op_CmpD && cop != Op_CmpF &&
       // Protect against swapping inputs to a compare when it is used by a
       // counted loop exit, which requires maintaining the loop-limit as in(2)
       !is_counted_loop_exit_test() ) {
     // Ok, commute the constant to the right of the cmp node.
     // Clone the Node, getting a new Node of the same class
     cmp = cmp->clone();
     // Swap inputs to the clone
     cmp->swap_edges(1, 2);
     cmp = phase->transform( cmp );
     return new (phase->C, 2) BoolNode( cmp, _test.commute() );
   }
   // Change "bool eq/ne (cmp (xor X 1) 0)" into "bool ne/eq (cmp X 0)".
   // The XOR-1 is an idiom used to flip the sense of a bool.  We flip the
   // test instead.
   int cmp1_op = cmp1->Opcode();
   const TypeInt* cmp2_type = phase->type(cmp2)->isa_int();
   if (cmp2_type == NULL)  return NULL;
   Node* j_xor = cmp1;
   if( cmp2_type == TypeInt::ZERO &&
       cmp1_op == Op_XorI &&
       j_xor->in(1) != j_xor &&          // An xor of itself is dead
       phase->type( j_xor->in(1) ) == TypeInt::BOOL &&
       phase->type( j_xor->in(2) ) == TypeInt::ONE &&
       (_test._test == BoolTest::eq ||
        _test._test == BoolTest::ne) ) {
     Node *ncmp = phase->transform(new (phase->C, 3) CmpINode(j_xor->in(1),cmp2));
     return new (phase->C, 2) BoolNode( ncmp, _test.negate() );
   }
   // Change "bool eq/ne (cmp (Conv2B X) 0)" into "bool eq/ne (cmp X 0)".
   // This is a standard idiom for branching on a boolean value.
   Node *c2b = cmp1;
   if( cmp2_type == TypeInt::ZERO &&
       cmp1_op == Op_Conv2B &&
       (_test._test == BoolTest::eq ||
        _test._test == BoolTest::ne) ) {
     Node *ncmp = phase->transform(phase->type(c2b->in(1))->isa_int()
        ? (Node*)new (phase->C, 3) CmpINode(c2b->in(1),cmp2)
        : (Node*)new (phase->C, 3) CmpPNode(c2b->in(1),phase->makecon(TypePtr::NULL_PTR))
     );
     return new (phase->C, 2) BoolNode( ncmp, _test._test );
   }
   // Comparing a SubI against a zero is equal to comparing the SubI
   // arguments directly.  This only works for eq and ne comparisons
   // due to possible integer overflow.
   if ((_test._test == BoolTest::eq || _test._test == BoolTest::ne) &&
         (cop == Op_CmpI) &&
         (cmp1->Opcode() == Op_SubI) &&
         ( cmp2_type == TypeInt::ZERO ) ) {
     Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(1),cmp1->in(2)));
     return new (phase->C, 2) BoolNode( ncmp, _test._test );
   }
   // Change (-A vs 0) into (A vs 0) by commuting the test.  Disallow in the
   // most general case because negating 0x80000000 does nothing.  Needed for
   // the CmpF3/SubI/CmpI idiom.
   if( cop == Op_CmpI &&
       cmp1->Opcode() == Op_SubI &&
       cmp2_type == TypeInt::ZERO &&
       phase->type( cmp1->in(1) ) == TypeInt::ZERO &&
       phase->type( cmp1->in(2) )->higher_equal(TypeInt::SYMINT) ) {
     Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(2),cmp2));
     return new (phase->C, 2) BoolNode( ncmp, _test.commute() );
   }
   //  The transformation below is not valid for either signed or unsigned
   //  comparisons due to wraparound concerns at MAX_VALUE and MIN_VALUE.
   //  This transformation can be resurrected when we are able to
   //  make inferences about the range of values being subtracted from
   //  (or added to) relative to the wraparound point.
   //
   //    // Remove +/-1's if possible.
   //    // "X <= Y-1" becomes "X <  Y"
   //    // "X+1 <= Y" becomes "X <  Y"
   //    // "X <  Y+1" becomes "X <= Y"
   //    // "X-1 <  Y" becomes "X <= Y"
   //    // Do not this to compares off of the counted-loop-end.  These guys are
   //    // checking the trip counter and they want to use the post-incremented
   //    // counter.  If they use the PRE-incremented counter, then the counter has
   //    // to be incremented in a private block on a loop backedge.
   //    if( du && du->cnt(this) && du->out(this)[0]->Opcode() == Op_CountedLoopEnd )
   //      return NULL;
   //  #ifndef PRODUCT
   //    // Do not do this in a wash GVN pass during verification.
   //    // Gets triggered by too many simple optimizations to be bothered with
   //    // re-trying it again and again.
   //    if( !phase->allow_progress() ) return NULL;
   //  #endif
   //    // Not valid for unsigned compare because of corner cases in involving zero.
   //    // For example, replacing "X-1 <u Y" with "X <=u Y" fails to throw an
   //    // exception in case X is 0 (because 0-1 turns into 4billion unsigned but
   //    // "0 <=u Y" is always true).
   //    if( cmp->Opcode() == Op_CmpU ) return NULL;
   //    int cmp2_op = cmp2->Opcode();
   //    if( _test._test == BoolTest::le ) {
   //      if( cmp1_op == Op_AddI &&
   //          phase->type( cmp1->in(2) ) == TypeInt::ONE )
   //        return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::lt );
   //      else if( cmp2_op == Op_AddI &&
   //         phase->type( cmp2->in(2) ) == TypeInt::MINUS_1 )
   //        return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::lt );
   //    } else if( _test._test == BoolTest::lt ) {
   //      if( cmp1_op == Op_AddI &&
   //          phase->type( cmp1->in(2) ) == TypeInt::MINUS_1 )
   //        return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::le );
   //      else if( cmp2_op == Op_AddI &&
   //         phase->type( cmp2->in(2) ) == TypeInt::ONE )
   //        return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::le );
   //    }
   return NULL;
 }
 //------------------------------Value------------------------------------------
 // Simplify a Bool (convert condition codes to boolean (1 or 0)) node,
 // based on local information.   If the input is constant, do it.
 const Type *BoolNode::Value( PhaseTransform *phase ) const {
   return _test.cc2logical( phase->type( in(1) ) );
 }
 //------------------------------dump_spec--------------------------------------
 // Dump special per-node info
 #ifndef PRODUCT
 void BoolNode::dump_spec(outputStream *st) const {
   st->print("[");
   _test.dump_on(st);
   st->print("]");
 }
 #endif
 //------------------------------is_counted_loop_exit_test--------------------------------------
 // Returns true if node is used by a counted loop node.
 bool BoolNode::is_counted_loop_exit_test() {
   for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) {
     Node* use = fast_out(i);
     if (use->is_CountedLoopEnd()) {
       return true;
     }
   }
   return false;
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute sqrt
 const Type *SqrtDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   if( d < 0.0 ) return Type::DOUBLE;
   return TypeD::make( sqrt( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute cos
 const Type *CosDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   return TypeD::make( StubRoutines::intrinsic_cos( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute sin
 const Type *SinDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   return TypeD::make( StubRoutines::intrinsic_sin( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute tan
 const Type *TanDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   return TypeD::make( StubRoutines::intrinsic_tan( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute log
 const Type *LogDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   return TypeD::make( StubRoutines::intrinsic_log( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute log10
 const Type *Log10DNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   return TypeD::make( StubRoutines::intrinsic_log10( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute exp
 const Type *ExpDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d = t1->getd();
   return TypeD::make( StubRoutines::intrinsic_exp( d ) );
 }
 //=============================================================================
 //------------------------------Value------------------------------------------
 // Compute pow
 const Type *PowDNode::Value( PhaseTransform *phase ) const {
   const Type *t1 = phase->type( in(1) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
   const Type *t2 = phase->type( in(2) );
   if( t2 == Type::TOP ) return Type::TOP;
   if( t2->base() != Type::DoubleCon ) return Type::DOUBLE;
   double d1 = t1->getd();
   double d2 = t2->getd();
   return TypeD::make( StubRoutines::intrinsic_pow( d1, d2 ) );
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/subnode.cpp@ae9241bbce4a (annotated)

src/share/vm/opto/subnode.cpp