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[InstSimplify] Don't try to constant fold AllocaInsts since it won't do anything.

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Should give a small compile time improvement.

llvm-svn: 300125
This commit is contained in:
Craig Topper 2017-04-12 22:54:24 +00:00
parent c764621a52
commit 8d04711bd9
1 changed files with 4 additions and 0 deletions
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4
lib/Analysis/InstructionSimplify.cpp
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@ -4627,6 +4627,10 @@ Value *llvm::SimplifyInstruction(Instruction *I, const DataLayout &DL,
Result = SimplifyCastInst(I->getOpcode(), I->getOperand(0), I->getType(),
DL, TLI, DT, AC, I);
break;
case Instruction::Alloca:
// No simplifications for Alloca and it can't be constant folded.
Result = nullptr;
break;
}
// In general, it is possible for computeKnownBits to determine all bits in a