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tryMergingIntoMemset can only handle constant length memsets.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123090 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-01-08 22:11:56 +00:00
parent d90a192279
commit 0468e3e265
1 changed files with 6 additions and 5 deletions
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11
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -515,11 +515,12 @@ bool MemCpyOpt::processStore(StoreInst *SI, BasicBlock::iterator &BBI) {
bool MemCpyOpt::processMemSet(MemSetInst *MSI, BasicBlock::iterator &BBI) { bool MemCpyOpt::processMemSet(MemSetInst *MSI, BasicBlock::iterator &BBI) {
// See if there is another memset or store neighboring this memset which // See if there is another memset or store neighboring this memset which
// allows us to widen out the memset to do a single larger store. // allows us to widen out the memset to do a single larger store.
if (Instruction *I = tryMergingIntoMemset(MSI, MSI->getDest(), if (isa<ConstantInt>(MSI->getLength()) && !MSI->isVolatile())
MSI->getValue())) { if (Instruction *I = tryMergingIntoMemset(MSI, MSI->getDest(),
BBI = I; // Don't invalidate iterator. MSI->getValue())) {
return true; BBI = I; // Don't invalidate iterator.
} return true;
}
return false; return false;
} }