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comparison src/share/vm/opto/addnode.cpp @ 32:4d428c5b4cb3

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6667573: Use set_req_X() in AddPNode::Ideal() for Iterative GVN Summary: set_req_X() puts dependent nodes on IGVN worklist which allows to improve graph and gives more opportunities for EA scalar replacement. Reviewed-by: jrose, never
author kvn
date Thu, 28 Feb 2008 15:40:09 -0800
parents ff5961f4c095
children 8a4ef4e001d3
comparison
equal deleted inserted replaced
31:6152cbb08ce9 32:4d428c5b4cb3
503 if( t12->is_con() ) { // Left input is an add of a constant? 503 if( t12->is_con() ) { // Left input is an add of a constant?
504 // If the right input is a constant, combine constants 504 // If the right input is a constant, combine constants
505 const Type *temp_t2 = phase->type( in(Offset) ); 505 const Type *temp_t2 = phase->type( in(Offset) );
506 if( temp_t2 == Type::TOP ) return NULL; 506 if( temp_t2 == Type::TOP ) return NULL;
507 const TypeX *t2 = temp_t2->is_intptr_t(); 507 const TypeX *t2 = temp_t2->is_intptr_t();
508 Node* address;
509 Node* offset;
508 if( t2->is_con() ) { 510 if( t2->is_con() ) {
509 // The Add of the flattened expression 511 // The Add of the flattened expression
510 set_req(Address, addp->in(Address)); 512 address = addp->in(Address);
511 set_req(Offset , phase->MakeConX(t2->get_con() + t12->get_con())); 513 offset = phase->MakeConX(t2->get_con() + t12->get_con());
512 return this; // Made progress 514 } else {
515 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con)
516 address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset)));
517 offset = addp->in(Offset);
513 } 518 }
514 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con) 519 PhaseIterGVN *igvn = phase->is_IterGVN();
515 set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset)))); 520 if( igvn ) {
516 set_req(Offset , addp->in(Offset)); 521 set_req_X(Address,address,igvn);
522 set_req_X(Offset,offset,igvn);
523 } else {
524 set_req(Address,address);
525 set_req(Offset,offset);
526 }
517 return this; 527 return this;
518 } 528 }
519 } 529 }
520 530
521 // Raw pointers? 531 // Raw pointers?