jdk8-mips64-public/hotspot: src/share/vm/opto/addnode.cpp@1bd45abaa507 (annotated)

src/share/vm/opto/addnode.cpp@1bd45abaa507 (annotated)

src/share/vm/opto/addnode.cpp

Wed, 16 Nov 2011 09:13:57 -0800

author: kvn
date: Wed, 16 Nov 2011 09:13:57 -0800
changeset 3311: 1bd45abaa507
parent 3241: a6eef545f1a2
child 4115: e626685e9f6c
permissions: -rw-r--r--

6890673: Eliminate allocations immediately after EA
Summary: Try to eliminate allocations and related locks immediately after escape analysis.
Reviewed-by: never

 /*
  * 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 "memory/allocation.inline.hpp"
 #include "opto/addnode.hpp"
 #include "opto/cfgnode.hpp"
 #include "opto/connode.hpp"
 #include "opto/machnode.hpp"
 #include "opto/mulnode.hpp"
 #include "opto/phaseX.hpp"
 #include "opto/subnode.hpp"
 // Portions of code courtesy of Clifford Click
 // Classic Add functionality.  This covers all the usual 'add' behaviors for
 // an algebraic ring.  Add-integer, add-float, add-double, and binary-or are
 // all inherited from this class.  The various identity values are supplied
 // by virtual functions.
 //=============================================================================
 //------------------------------hash-------------------------------------------
 // Hash function over AddNodes.  Needs to be commutative; i.e., I swap
 // (commute) inputs to AddNodes willy-nilly so the hash function must return
 // the same value in the presence of edge swapping.
 uint AddNode::hash() const {
   return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode();
 }
 //------------------------------Identity---------------------------------------
 // If either input is a constant 0, return the other input.
 Node *AddNode::Identity( PhaseTransform *phase ) {
   const Type *zero = add_id();  // The additive identity
   if( phase->type( in(1) )->higher_equal( zero ) ) return in(2);
   if( phase->type( in(2) )->higher_equal( zero ) ) return in(1);
   return this;
 }
 //------------------------------commute----------------------------------------
 // Commute operands to move loads and constants to the right.
 static bool commute( Node *add, int con_left, int con_right ) {
   Node *in1 = add->in(1);
   Node *in2 = add->in(2);
   // Convert "1+x" into "x+1".
   // Right is a constant; leave it
   if( con_right ) return false;
   // Left is a constant; move it right.
   if( con_left ) {
     add->swap_edges(1, 2);
     return true;
   }
   // Convert "Load+x" into "x+Load".
   // Now check for loads
   if (in2->is_Load()) {
     if (!in1->is_Load()) {
       // already x+Load to return
       return false;
     }
     // both are loads, so fall through to sort inputs by idx
   } else if( in1->is_Load() ) {
     // Left is a Load and Right is not; move it right.
     add->swap_edges(1, 2);
     return true;
   }
   PhiNode *phi;
   // Check for tight loop increments: Loop-phi of Add of loop-phi
   if( in1->is_Phi() && (phi = in1->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add)
     return false;
   if( in2->is_Phi() && (phi = in2->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add){
     add->swap_edges(1, 2);
     return true;
   }
   // Otherwise, sort inputs (commutativity) to help value numbering.
   if( in1->_idx > in2->_idx ) {
     add->swap_edges(1, 2);
     return true;
   }
   return false;
 }
 //------------------------------Idealize---------------------------------------
 // If we get here, we assume we are associative!
 Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   const Type *t1 = phase->type( in(1) );
   const Type *t2 = phase->type( in(2) );
   int con_left  = t1->singleton();
   int con_right = t2->singleton();
   // Check for commutative operation desired
   if( commute(this,con_left,con_right) ) return this;
   AddNode *progress = NULL;             // Progress flag
   // Convert "(x+1)+2" into "x+(1+2)".  If the right input is a
   // constant, and the left input is an add of a constant, flatten the
   // expression tree.
   Node *add1 = in(1);
   Node *add2 = in(2);
   int add1_op = add1->Opcode();
   int this_op = Opcode();
   if( con_right && t2 != Type::TOP && // Right input is a constant?
       add1_op == this_op ) { // Left input is an Add?
     // Type of left _in right input
     const Type *t12 = phase->type( add1->in(2) );
     if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant?
       // Check for rare case of closed data cycle which can happen inside
       // unreachable loops. In these cases the computation is undefined.
 #ifdef ASSERT
       Node *add11    = add1->in(1);
       int   add11_op = add11->Opcode();
       if( (add1 == add1->in(1))
          || (add11_op == this_op && add11->in(1) == add1) ) {
         assert(false, "dead loop in AddNode::Ideal");
       }
 #endif
       // The Add of the flattened expression
       Node *x1 = add1->in(1);
       Node *x2 = phase->makecon( add1->as_Add()->add_ring( t2, t12 ));
       PhaseIterGVN *igvn = phase->is_IterGVN();
       if( igvn ) {
         set_req_X(2,x2,igvn);
         set_req_X(1,x1,igvn);
       } else {
         set_req(2,x2);
         set_req(1,x1);
       }
       progress = this;            // Made progress
       add1 = in(1);
       add1_op = add1->Opcode();
     }
   }
   // Convert "(x+1)+y" into "(x+y)+1".  Push constants down the expression tree.
   if( add1_op == this_op && !con_right ) {
     Node *a12 = add1->in(2);
     const Type *t12 = phase->type( a12 );
     if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) &&
        !(add1->in(1)->is_Phi() && add1->in(1)->as_Phi()->is_tripcount()) ) {
       assert(add1->in(1) != this, "dead loop in AddNode::Ideal");
       add2 = add1->clone();
       add2->set_req(2, in(2));
       add2 = phase->transform(add2);
       set_req(1, add2);
       set_req(2, a12);
       progress = this;
       add2 = a12;
     }
   }
   // Convert "x+(y+1)" into "(x+y)+1".  Push constants down the expression tree.
   int add2_op = add2->Opcode();
   if( add2_op == this_op && !con_left ) {
     Node *a22 = add2->in(2);
     const Type *t22 = phase->type( a22 );
     if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) &&
        !(add2->in(1)->is_Phi() && add2->in(1)->as_Phi()->is_tripcount()) ) {
       assert(add2->in(1) != this, "dead loop in AddNode::Ideal");
       Node *addx = add2->clone();
       addx->set_req(1, in(1));
       addx->set_req(2, add2->in(1));
       addx = phase->transform(addx);
       set_req(1, addx);
       set_req(2, a22);
       progress = this;
     }
   }
   return progress;
 }
 //------------------------------Value-----------------------------------------
 // An add node sums it's two _in.  If one input is an RSD, we must mixin
 // the other input's symbols.
 const Type *AddNode::Value( PhaseTransform *phase ) const {
   // Either input is TOP ==> the result is TOP
   const Type *t1 = phase->type( in(1) );
   const Type *t2 = phase->type( in(2) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t2 == Type::TOP ) return Type::TOP;
   // 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;
   // Check for an addition involving the additive identity
   const Type *tadd = add_of_identity( t1, t2 );
   if( tadd ) return tadd;
   return add_ring(t1,t2);               // Local flavor of type addition
 }
 //------------------------------add_identity-----------------------------------
 // Check for addition of the identity
 const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const {
   const Type *zero = add_id();  // The additive identity
   if( t1->higher_equal( zero ) ) return t2;
   if( t2->higher_equal( zero ) ) return t1;
   return NULL;
 }
 //=============================================================================
 //------------------------------Idealize---------------------------------------
 Node *AddINode::Ideal(PhaseGVN *phase, bool can_reshape) {
   Node* in1 = in(1);
   Node* in2 = in(2);
   int op1 = in1->Opcode();
   int op2 = in2->Opcode();
   // Fold (con1-x)+con2 into (con1+con2)-x
   if ( op1 == Op_AddI && op2 == Op_SubI ) {
     // Swap edges to try optimizations below
     in1 = in2;
     in2 = in(1);
     op1 = op2;
     op2 = in2->Opcode();
   }
   if( op1 == Op_SubI ) {
     const Type *t_sub1 = phase->type( in1->in(1) );
     const Type *t_2    = phase->type( in2        );
     if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP )
       return new (phase->C, 3) SubINode(phase->makecon( add_ring( t_sub1, t_2 ) ),
                               in1->in(2) );
     // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)"
     if( op2 == Op_SubI ) {
       // Check for dead cycle: d = (a-b)+(c-d)
       assert( in1->in(2) != this && in2->in(2) != this,
               "dead loop in AddINode::Ideal" );
       Node *sub  = new (phase->C, 3) SubINode(NULL, NULL);
       sub->init_req(1, phase->transform(new (phase->C, 3) AddINode(in1->in(1), in2->in(1) ) ));
       sub->init_req(2, phase->transform(new (phase->C, 3) AddINode(in1->in(2), in2->in(2) ) ));
       return sub;
     }
     // Convert "(a-b)+(b+c)" into "(a+c)"
     if( op2 == Op_AddI && in1->in(2) == in2->in(1) ) {
       assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal");
       return new (phase->C, 3) AddINode(in1->in(1), in2->in(2));
     }
     // Convert "(a-b)+(c+b)" into "(a+c)"
     if( op2 == Op_AddI && in1->in(2) == in2->in(2) ) {
       assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddINode::Ideal");
       return new (phase->C, 3) AddINode(in1->in(1), in2->in(1));
     }
     // Convert "(a-b)+(b-c)" into "(a-c)"
     if( op2 == Op_SubI && in1->in(2) == in2->in(1) ) {
       assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal");
       return new (phase->C, 3) SubINode(in1->in(1), in2->in(2));
     }
     // Convert "(a-b)+(c-a)" into "(c-b)"
     if( op2 == Op_SubI && in1->in(1) == in2->in(2) ) {
       assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddINode::Ideal");
       return new (phase->C, 3) SubINode(in2->in(1), in1->in(2));
     }
   }
   // Convert "x+(0-y)" into "(x-y)"
   if( op2 == Op_SubI && phase->type(in2->in(1)) == TypeInt::ZERO )
     return new (phase->C, 3) SubINode(in1, in2->in(2) );
   // Convert "(0-y)+x" into "(x-y)"
   if( op1 == Op_SubI && phase->type(in1->in(1)) == TypeInt::ZERO )
     return new (phase->C, 3) SubINode( in2, in1->in(2) );
   // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y.
   // Helps with array allocation math constant folding
   // See 4790063:
   // Unrestricted transformation is unsafe for some runtime values of 'x'
   // ( x ==  0, z == 1, y == -1 ) fails
   // ( x == -5, z == 1, y ==  1 ) fails
   // Transform works for small z and small negative y when the addition
   // (x + (y << z)) does not cross zero.
   // Implement support for negative y and (x >= -(y << z))
   // Have not observed cases where type information exists to support
   // positive y and (x <= -(y << z))
   if( op1 == Op_URShiftI && op2 == Op_ConI &&
       in1->in(2)->Opcode() == Op_ConI ) {
     jint z = phase->type( in1->in(2) )->is_int()->get_con() & 0x1f; // only least significant 5 bits matter
     jint y = phase->type( in2 )->is_int()->get_con();
     if( z < 5 && -5 < y && y < 0 ) {
       const Type *t_in11 = phase->type(in1->in(1));
       if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z)) ) {
         Node *a = phase->transform( new (phase->C, 3) AddINode( in1->in(1), phase->intcon(y<<z) ) );
         return new (phase->C, 3) URShiftINode( a, in1->in(2) );
       }
     }
   }
   return AddNode::Ideal(phase, can_reshape);
 }
 //------------------------------Identity---------------------------------------
 // Fold (x-y)+y  OR  y+(x-y)  into  x
 Node *AddINode::Identity( PhaseTransform *phase ) {
   if( in(1)->Opcode() == Op_SubI && phase->eqv(in(1)->in(2),in(2)) ) {
     return in(1)->in(1);
   }
   else if( in(2)->Opcode() == Op_SubI && phase->eqv(in(2)->in(2),in(1)) ) {
     return in(2)->in(1);
   }
   return AddNode::Identity(phase);
 }
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs.  Guaranteed never
 // to be passed a TOP or BOTTOM type, these are filtered out by
 // pre-check.
 const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeInt *r0 = t0->is_int(); // Handy access
   const TypeInt *r1 = t1->is_int();
   int lo = r0->_lo + r1->_lo;
   int hi = r0->_hi + r1->_hi;
   if( !(r0->is_con() && r1->is_con()) ) {
     // Not both constants, compute approximate result
     if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) {
       lo = min_jint; hi = max_jint; // Underflow on the low side
     }
     if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) {
       lo = min_jint; hi = max_jint; // Overflow on the high side
     }
     if( lo > hi ) {               // Handle overflow
       lo = min_jint; hi = max_jint;
     }
   } else {
     // both constants, compute precise result using 'lo' and 'hi'
     // Semantics define overflow and underflow for integer addition
     // as expected.  In particular: 0x80000000 + 0x80000000 --> 0x0
   }
   return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) );
 }
 //=============================================================================
 //------------------------------Idealize---------------------------------------
 Node *AddLNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   Node* in1 = in(1);
   Node* in2 = in(2);
   int op1 = in1->Opcode();
   int op2 = in2->Opcode();
   // Fold (con1-x)+con2 into (con1+con2)-x
   if ( op1 == Op_AddL && op2 == Op_SubL ) {
     // Swap edges to try optimizations below
     in1 = in2;
     in2 = in(1);
     op1 = op2;
     op2 = in2->Opcode();
   }
   // Fold (con1-x)+con2 into (con1+con2)-x
   if( op1 == Op_SubL ) {
     const Type *t_sub1 = phase->type( in1->in(1) );
     const Type *t_2    = phase->type( in2        );
     if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP )
       return new (phase->C, 3) SubLNode(phase->makecon( add_ring( t_sub1, t_2 ) ),
                               in1->in(2) );
     // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)"
     if( op2 == Op_SubL ) {
       // Check for dead cycle: d = (a-b)+(c-d)
       assert( in1->in(2) != this && in2->in(2) != this,
               "dead loop in AddLNode::Ideal" );
       Node *sub  = new (phase->C, 3) SubLNode(NULL, NULL);
       sub->init_req(1, phase->transform(new (phase->C, 3) AddLNode(in1->in(1), in2->in(1) ) ));
       sub->init_req(2, phase->transform(new (phase->C, 3) AddLNode(in1->in(2), in2->in(2) ) ));
       return sub;
     }
     // Convert "(a-b)+(b+c)" into "(a+c)"
     if( op2 == Op_AddL && in1->in(2) == in2->in(1) ) {
       assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal");
       return new (phase->C, 3) AddLNode(in1->in(1), in2->in(2));
     }
     // Convert "(a-b)+(c+b)" into "(a+c)"
     if( op2 == Op_AddL && in1->in(2) == in2->in(2) ) {
       assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal");
       return new (phase->C, 3) AddLNode(in1->in(1), in2->in(1));
     }
     // Convert "(a-b)+(b-c)" into "(a-c)"
     if( op2 == Op_SubL && in1->in(2) == in2->in(1) ) {
       assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal");
       return new (phase->C, 3) SubLNode(in1->in(1), in2->in(2));
     }
     // Convert "(a-b)+(c-a)" into "(c-b)"
     if( op2 == Op_SubL && in1->in(1) == in1->in(2) ) {
       assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal");
       return new (phase->C, 3) SubLNode(in2->in(1), in1->in(2));
     }
   }
   // Convert "x+(0-y)" into "(x-y)"
   if( op2 == Op_SubL && phase->type(in2->in(1)) == TypeLong::ZERO )
     return new (phase->C, 3) SubLNode( in1, in2->in(2) );
   // Convert "(0-y)+x" into "(x-y)"
   if( op1 == Op_SubL && phase->type(in1->in(1)) == TypeInt::ZERO )
     return new (phase->C, 3) SubLNode( in2, in1->in(2) );
   // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)"
   // into "(X<<1)+Y" and let shift-folding happen.
   if( op2 == Op_AddL &&
       in2->in(1) == in1 &&
       op1 != Op_ConL &&
 ) {
     Node *shift = phase->transform(new (phase->C, 3) LShiftLNode(in1,phase->intcon(1)));
     return new (phase->C, 3) AddLNode(shift,in2->in(2));
   }
   return AddNode::Ideal(phase, can_reshape);
 }
 //------------------------------Identity---------------------------------------
 // Fold (x-y)+y  OR  y+(x-y)  into  x
 Node *AddLNode::Identity( PhaseTransform *phase ) {
   if( in(1)->Opcode() == Op_SubL && phase->eqv(in(1)->in(2),in(2)) ) {
     return in(1)->in(1);
   }
   else if( in(2)->Opcode() == Op_SubL && phase->eqv(in(2)->in(2),in(1)) ) {
     return in(2)->in(1);
   }
   return AddNode::Identity(phase);
 }
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs.  Guaranteed never
 // to be passed a TOP or BOTTOM type, these are filtered out by
 // pre-check.
 const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeLong *r0 = t0->is_long(); // Handy access
   const TypeLong *r1 = t1->is_long();
   jlong lo = r0->_lo + r1->_lo;
   jlong hi = r0->_hi + r1->_hi;
   if( !(r0->is_con() && r1->is_con()) ) {
     // Not both constants, compute approximate result
     if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) {
       lo =min_jlong; hi = max_jlong; // Underflow on the low side
     }
     if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) {
       lo = min_jlong; hi = max_jlong; // Overflow on the high side
     }
     if( lo > hi ) {               // Handle overflow
       lo = min_jlong; hi = max_jlong;
     }
   } else {
     // both constants, compute precise result using 'lo' and 'hi'
     // Semantics define overflow and underflow for integer addition
     // as expected.  In particular: 0x80000000 + 0x80000000 --> 0x0
   }
   return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) );
 }
 //=============================================================================
 //------------------------------add_of_identity--------------------------------
 // Check for addition of the identity
 const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const {
   // x ADD 0  should return x unless 'x' is a -zero
   //
   // const Type *zero = add_id();     // The additive identity
   // jfloat f1 = t1->getf();
   // jfloat f2 = t2->getf();
   //
   // if( t1->higher_equal( zero ) ) return t2;
   // if( t2->higher_equal( zero ) ) return t1;
   return NULL;
 }
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs.
 // This also type-checks the inputs for sanity.  Guaranteed never to
 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
 const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const {
   // We must be adding 2 float constants.
   return TypeF::make( t0->getf() + t1->getf() );
 }
 //------------------------------Ideal------------------------------------------
 Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   if( IdealizedNumerics && !phase->C->method()->is_strict() ) {
     return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms
   }
   // Floating point additions are not associative because of boundary conditions (infinity)
   return commute(this,
                  phase->type( in(1) )->singleton(),
                  phase->type( in(2) )->singleton() ) ? this : NULL;
 }
 //=============================================================================
 //------------------------------add_of_identity--------------------------------
 // Check for addition of the identity
 const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const {
   // x ADD 0  should return x unless 'x' is a -zero
   //
   // const Type *zero = add_id();     // The additive identity
   // jfloat f1 = t1->getf();
   // jfloat f2 = t2->getf();
   //
   // if( t1->higher_equal( zero ) ) return t2;
   // if( t2->higher_equal( zero ) ) return t1;
   return NULL;
 }
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs.
 // This also type-checks the inputs for sanity.  Guaranteed never to
 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
 const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const {
   // We must be adding 2 double constants.
   return TypeD::make( t0->getd() + t1->getd() );
 }
 //------------------------------Ideal------------------------------------------
 Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   if( IdealizedNumerics && !phase->C->method()->is_strict() ) {
     return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms
   }
   // Floating point additions are not associative because of boundary conditions (infinity)
   return commute(this,
                  phase->type( in(1) )->singleton(),
                  phase->type( in(2) )->singleton() ) ? this : NULL;
 }
 //=============================================================================
 //------------------------------Identity---------------------------------------
 // If one input is a constant 0, return the other input.
 Node *AddPNode::Identity( PhaseTransform *phase ) {
   return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this;
 }
 //------------------------------Idealize---------------------------------------
 Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) {
   // Bail out if dead inputs
   if( phase->type( in(Address) ) == Type::TOP ) return NULL;
   // If the left input is an add of a constant, flatten the expression tree.
   const Node *n = in(Address);
   if (n->is_AddP() && n->in(Base) == in(Base)) {
     const AddPNode *addp = n->as_AddP(); // Left input is an AddP
     assert( !addp->in(Address)->is_AddP() ||
              addp->in(Address)->as_AddP() != addp,
             "dead loop in AddPNode::Ideal" );
     // Type of left input's right input
     const Type *t = phase->type( addp->in(Offset) );
     if( t == Type::TOP ) return NULL;
     const TypeX *t12 = t->is_intptr_t();
     if( t12->is_con() ) {       // Left input is an add of a constant?
       // If the right input is a constant, combine constants
       const Type *temp_t2 = phase->type( in(Offset) );
       if( temp_t2 == Type::TOP ) return NULL;
       const TypeX *t2 = temp_t2->is_intptr_t();
       Node* address;
       Node* offset;
       if( t2->is_con() ) {
         // The Add of the flattened expression
         address = addp->in(Address);
         offset  = phase->MakeConX(t2->get_con() + t12->get_con());
       } else {
         // Else move the constant to the right.  ((A+con)+B) into ((A+B)+con)
         address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset)));
         offset  = addp->in(Offset);
       }
       PhaseIterGVN *igvn = phase->is_IterGVN();
       if( igvn ) {
         set_req_X(Address,address,igvn);
         set_req_X(Offset,offset,igvn);
       } else {
         set_req(Address,address);
         set_req(Offset,offset);
       }
       return this;
     }
   }
   // Raw pointers?
   if( in(Base)->bottom_type() == Type::TOP ) {
     // If this is a NULL+long form (from unsafe accesses), switch to a rawptr.
     if (phase->type(in(Address)) == TypePtr::NULL_PTR) {
       Node* offset = in(Offset);
       return new (phase->C, 2) CastX2PNode(offset);
     }
   }
   // If the right is an add of a constant, push the offset down.
   // Convert: (ptr + (offset+con)) into (ptr+offset)+con.
   // The idea is to merge array_base+scaled_index groups together,
   // and only have different constant offsets from the same base.
   const Node *add = in(Offset);
   if( add->Opcode() == Op_AddX && add->in(1) != add ) {
     const Type *t22 = phase->type( add->in(2) );
     if( t22->singleton() && (t22 != Type::TOP) ) {  // Right input is an add of a constant?
       set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),in(Address),add->in(1))));
       set_req(Offset, add->in(2));
       return this;              // Made progress
     }
   }
   return NULL;                  // No progress
 }
 //------------------------------bottom_type------------------------------------
 // Bottom-type is the pointer-type with unknown offset.
 const Type *AddPNode::bottom_type() const {
   if (in(Address) == NULL)  return TypePtr::BOTTOM;
   const TypePtr *tp = in(Address)->bottom_type()->isa_ptr();
   if( !tp ) return Type::TOP;   // TOP input means TOP output
   assert( in(Offset)->Opcode() != Op_ConP, "" );
   const Type *t = in(Offset)->bottom_type();
   if( t == Type::TOP )
     return tp->add_offset(Type::OffsetTop);
   const TypeX *tx = t->is_intptr_t();
   intptr_t txoffset = Type::OffsetBot;
   if (tx->is_con()) {   // Left input is an add of a constant?
     txoffset = tx->get_con();
   }
   return tp->add_offset(txoffset);
 }
 //------------------------------Value------------------------------------------
 const Type *AddPNode::Value( PhaseTransform *phase ) const {
   // Either input is TOP ==> the result is TOP
   const Type *t1 = phase->type( in(Address) );
   const Type *t2 = phase->type( in(Offset) );
   if( t1 == Type::TOP ) return Type::TOP;
   if( t2 == Type::TOP ) return Type::TOP;
   // Left input is a pointer
   const TypePtr *p1 = t1->isa_ptr();
   // Right input is an int
   const TypeX *p2 = t2->is_intptr_t();
   // Add 'em
   intptr_t p2offset = Type::OffsetBot;
   if (p2->is_con()) {   // Left input is an add of a constant?
     p2offset = p2->get_con();
   }
   return p1->add_offset(p2offset);
 }
 //------------------------Ideal_base_and_offset--------------------------------
 // Split an oop pointer into a base and offset.
 // (The offset might be Type::OffsetBot in the case of an array.)
 // Return the base, or NULL if failure.
 Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase,
                                       // second return value:
                                       intptr_t& offset) {
   if (ptr->is_AddP()) {
     Node* base = ptr->in(AddPNode::Base);
     Node* addr = ptr->in(AddPNode::Address);
     Node* offs = ptr->in(AddPNode::Offset);
     if (base == addr || base->is_top()) {
       offset = phase->find_intptr_t_con(offs, Type::OffsetBot);
       if (offset != Type::OffsetBot) {
         return addr;
       }
     }
   }
   offset = Type::OffsetBot;
   return NULL;
 }
 //------------------------------unpack_offsets----------------------------------
 // Collect the AddP offset values into the elements array, giving up
 // if there are more than length.
 int AddPNode::unpack_offsets(Node* elements[], int length) {
   int count = 0;
   Node* addr = this;
   Node* base = addr->in(AddPNode::Base);
   while (addr->is_AddP()) {
     if (addr->in(AddPNode::Base) != base) {
       // give up
       return -1;
     }
     elements[count++] = addr->in(AddPNode::Offset);
     if (count == length) {
       // give up
       return -1;
     }
     addr = addr->in(AddPNode::Address);
   }
   if (addr != base) {
     return -1;
   }
   return count;
 }
 //------------------------------match_edge-------------------------------------
 // Do we Match on this edge index or not?  Do not match base pointer edge
 uint AddPNode::match_edge(uint idx) const {
   return idx > Base;
 }
 //=============================================================================
 //------------------------------Identity---------------------------------------
 Node *OrINode::Identity( PhaseTransform *phase ) {
   // x | x => x
   if (phase->eqv(in(1), in(2))) {
     return in(1);
   }
   return AddNode::Identity(phase);
 }
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs IN THE CURRENT RING.  For
 // the logical operations the ring's ADD is really a logical OR function.
 // This also type-checks the inputs for sanity.  Guaranteed never to
 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
 const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeInt *r0 = t0->is_int(); // Handy access
   const TypeInt *r1 = t1->is_int();
   // If both args are bool, can figure out better types
   if ( r0 == TypeInt::BOOL ) {
     if ( r1 == TypeInt::ONE) {
       return TypeInt::ONE;
     } else if ( r1 == TypeInt::BOOL ) {
       return TypeInt::BOOL;
     }
   } else if ( r0 == TypeInt::ONE ) {
     if ( r1 == TypeInt::BOOL ) {
       return TypeInt::ONE;
     }
   }
   // If either input is not a constant, just return all integers.
   if( !r0->is_con() || !r1->is_con() )
     return TypeInt::INT;        // Any integer, but still no symbols.
   // Otherwise just OR them bits.
   return TypeInt::make( r0->get_con() | r1->get_con() );
 }
 //=============================================================================
 //------------------------------Identity---------------------------------------
 Node *OrLNode::Identity( PhaseTransform *phase ) {
   // x | x => x
   if (phase->eqv(in(1), in(2))) {
     return in(1);
   }
   return AddNode::Identity(phase);
 }
 //------------------------------add_ring---------------------------------------
 const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeLong *r0 = t0->is_long(); // Handy access
   const TypeLong *r1 = t1->is_long();
   // If either input is not a constant, just return all integers.
   if( !r0->is_con() || !r1->is_con() )
     return TypeLong::LONG;      // Any integer, but still no symbols.
   // Otherwise just OR them bits.
   return TypeLong::make( r0->get_con() | r1->get_con() );
 }
 //=============================================================================
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs IN THE CURRENT RING.  For
 // the logical operations the ring's ADD is really a logical OR function.
 // This also type-checks the inputs for sanity.  Guaranteed never to
 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
 const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeInt *r0 = t0->is_int(); // Handy access
   const TypeInt *r1 = t1->is_int();
   // Complementing a boolean?
   if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE
                                || r1 == TypeInt::BOOL))
     return TypeInt::BOOL;
   if( !r0->is_con() || !r1->is_con() ) // Not constants
     return TypeInt::INT;        // Any integer, but still no symbols.
   // Otherwise just XOR them bits.
   return TypeInt::make( r0->get_con() ^ r1->get_con() );
 }
 //=============================================================================
 //------------------------------add_ring---------------------------------------
 const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeLong *r0 = t0->is_long(); // Handy access
   const TypeLong *r1 = t1->is_long();
   // If either input is not a constant, just return all integers.
   if( !r0->is_con() || !r1->is_con() )
     return TypeLong::LONG;      // Any integer, but still no symbols.
   // Otherwise just OR them bits.
   return TypeLong::make( r0->get_con() ^ r1->get_con() );
 }
 //=============================================================================
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs.
 const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeInt *r0 = t0->is_int(); // Handy access
   const TypeInt *r1 = t1->is_int();
   // Otherwise just MAX them bits.
   return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) );
 }
 //=============================================================================
 //------------------------------Idealize---------------------------------------
 // MINs show up in range-check loop limit calculations.  Look for
 // "MIN2(x+c0,MIN2(y,x+c1))".  Pick the smaller constant: "MIN2(x+c0,y)"
 Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) {
   Node *progress = NULL;
   // Force a right-spline graph
   Node *l = in(1);
   Node *r = in(2);
   // Transform  MinI1( MinI2(a,b), c)  into  MinI1( a, MinI2(b,c) )
   // to force a right-spline graph for the rest of MinINode::Ideal().
   if( l->Opcode() == Op_MinI ) {
     assert( l != l->in(1), "dead loop in MinINode::Ideal" );
     r = phase->transform(new (phase->C, 3) MinINode(l->in(2),r));
     l = l->in(1);
     set_req(1, l);
     set_req(2, r);
     return this;
   }
   // Get left input & constant
   Node *x = l;
   int x_off = 0;
   if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant
       x->in(2)->is_Con() ) {
     const Type *t = x->in(2)->bottom_type();
     if( t == Type::TOP ) return NULL;  // No progress
     x_off = t->is_int()->get_con();
     x = x->in(1);
   }
   // Scan a right-spline-tree for MINs
   Node *y = r;
   int y_off = 0;
   // Check final part of MIN tree
   if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant
       y->in(2)->is_Con() ) {
     const Type *t = y->in(2)->bottom_type();
     if( t == Type::TOP ) return NULL;  // No progress
     y_off = t->is_int()->get_con();
     y = y->in(1);
   }
   if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) {
     swap_edges(1, 2);
     return this;
   }
   if( r->Opcode() == Op_MinI ) {
     assert( r != r->in(2), "dead loop in MinINode::Ideal" );
     y = r->in(1);
     // Check final part of MIN tree
     if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant
         y->in(2)->is_Con() ) {
       const Type *t = y->in(2)->bottom_type();
       if( t == Type::TOP ) return NULL;  // No progress
       y_off = t->is_int()->get_con();
       y = y->in(1);
     }
     if( x->_idx > y->_idx )
       return new (phase->C, 3) MinINode(r->in(1),phase->transform(new (phase->C, 3) MinINode(l,r->in(2))));
     // See if covers: MIN2(x+c0,MIN2(y+c1,z))
     if( !phase->eqv(x,y) ) return NULL;
     // If (y == x) transform MIN2(x+c0, MIN2(x+c1,z)) into
     // MIN2(x+c0 or x+c1 which less, z).
     return new (phase->C, 3) MinINode(phase->transform(new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)))),r->in(2));
   } else {
     // See if covers: MIN2(x+c0,y+c1)
     if( !phase->eqv(x,y) ) return NULL;
     // If (y == x) transform MIN2(x+c0,x+c1) into x+c0 or x+c1 which less.
     return new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)));
   }
 }
 //------------------------------add_ring---------------------------------------
 // Supplied function returns the sum of the inputs.
 const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const {
   const TypeInt *r0 = t0->is_int(); // Handy access
   const TypeInt *r1 = t1->is_int();
   // Otherwise just MIN them bits.
   return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) );
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/addnode.cpp@1bd45abaa507 (annotated)

src/share/vm/opto/addnode.cpp