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comparison src/share/vm/opto/subnode.cpp @ 33:3288958bf319

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6667580: Optimize CmpP for allocations Summary: CmpP could be optimized out if it compares new allocated objects. Reviewed-by: jrose, never, rasbold
author kvn
date Fri, 29 Feb 2008 09:57:18 -0800
parents a61af66fc99e
children ba764ed4b6f2
comparison
equal deleted inserted replaced
32:4d428c5b4cb3 33:3288958bf319
612 612
613 // See if it is 2 unrelated classes. 613 // See if it is 2 unrelated classes.
614 const TypeOopPtr* p0 = r0->isa_oopptr(); 614 const TypeOopPtr* p0 = r0->isa_oopptr();
615 const TypeOopPtr* p1 = r1->isa_oopptr(); 615 const TypeOopPtr* p1 = r1->isa_oopptr();
616 if (p0 && p1) { 616 if (p0 && p1) {
617 Node* in1 = in(1)->uncast();
618 Node* in2 = in(2)->uncast();
619 AllocateNode* alloc1 = AllocateNode::Ideal_allocation(in1, NULL);
620 AllocateNode* alloc2 = AllocateNode::Ideal_allocation(in2, NULL);
621 if (MemNode::detect_ptr_independence(in1, alloc1, in2, alloc2, NULL)) {
622 return TypeInt::CC_GT; // different pointers
623 }
617 ciKlass* klass0 = p0->klass(); 624 ciKlass* klass0 = p0->klass();
618 bool xklass0 = p0->klass_is_exact(); 625 bool xklass0 = p0->klass_is_exact();
619 ciKlass* klass1 = p1->klass(); 626 ciKlass* klass1 = p1->klass();
620 bool xklass1 = p1->klass_is_exact(); 627 bool xklass1 = p1->klass_is_exact();
621 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); 628 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0);