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instcombine shouldn't delete all null checks for mallocs.

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This fixes PR5130.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83290 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-10-05 02:47:47 +00:00
parent 92bef66c10
commit bbc33853a5
2 changed files with 21 additions and 2 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@@ -5934,9 +5934,9 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
// icmp <global/alloca*/null>, <global/alloca*/null> - Global/Stack value
// addresses never equal each other! We already know that Op0 != Op1.
if ((isa<GlobalValue>(Op0) || isa<AllocaInst>(Op0) || isMalloc(Op0) ||
if ((isa<GlobalValue>(Op0) || isa<AllocaInst>(Op0) ||
isa<ConstantPointerNull>(Op0)) &&
(isa<GlobalValue>(Op1) || isa<AllocaInst>(Op1) || isMalloc(Op1) ||
(isa<GlobalValue>(Op1) || isa<AllocaInst>(Op1) ||
isa<ConstantPointerNull>(Op1)))
return ReplaceInstUsesWith(I, ConstantInt::get(Type::getInt1Ty(*Context),
!I.isTrueWhenEqual()));