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| author | Dan Gohman <dan433584@gmail.com> | 2013-01-31 23:49:33 +0000 |
|---|---|---|
| committer | Dan Gohman <dan433584@gmail.com> | 2013-01-31 23:49:33 +0000 |
| commit | ac08785edaac826afe11a4e596a46fc693848848 (patch) | |
| tree | 3113dd8303ade3bda241d64bc22e2ced5e711207 /lib/Analysis | |
| parent | 27aacedf7d975243170206efb948a20d6fd4a2c1 (diff) | |
| download | external_llvm-ac08785edaac826afe11a4e596a46fc693848848.zip external_llvm-ac08785edaac826afe11a4e596a46fc693848848.tar.gz external_llvm-ac08785edaac826afe11a4e596a46fc693848848.tar.bz2 | |
An alloca can be equal to an argument. It can't *alias* an alloca, but it could
be equal, since there's nothing preventing a caller from correctly predicting
the stack location of an alloca.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174119 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis')
| -rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index d5e38e5..f8e76ca 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -1828,18 +1828,6 @@ static Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS, else if (Pred == CmpInst::ICMP_NE) return ConstantInt::get(ITy, true); } - } else if (Argument *LHSArg = dyn_cast<Argument>(LHSPtr)) { - RHSPtr = RHSPtr->stripInBoundsOffsets(); - // An alloca can't be equal to an argument unless they come from separate - // functions via inlining. - if (AllocaInst *RHSInst = dyn_cast<AllocaInst>(RHSPtr)) { - if (LHSArg->getParent() == RHSInst->getParent()->getParent()) { - if (Pred == CmpInst::ICMP_EQ) - return ConstantInt::get(ITy, false); - else if (Pred == CmpInst::ICMP_NE) - return ConstantInt::get(ITy, true); - } - } } // If we are comparing with zero then try hard since this is a common case. |