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When looking for dependencies on the src pointer, scan the src pointer. Scanning

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on the memcpy call will pull up other unrelated stuff. Fixes PR11142.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142150 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-10-16 20:13:32 +00:00
parent ea6578b72a
commit 36c7e6c36c
2 changed files with 36 additions and 13 deletions
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29
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -806,21 +806,26 @@ bool MemCpyOpt::processMemCpy(MemCpyInst *M) {
// a) memcpy-memcpy xform which exposes redundance for DSE.
// b) call-memcpy xform for return slot optimization.
MemDepResult DepInfo = MD->getDependency(M);
if (!DepInfo.isClobber())
return false;
if (MemCpyInst *MDep = dyn_cast<MemCpyInst>(DepInfo.getInst()))
return processMemCpyMemCpyDependence(M, MDep, CopySize->getZExtValue());
if (CallInst *C = dyn_cast<CallInst>(DepInfo.getInst())) {
if (performCallSlotOptzn(M, M->getDest(), M->getSource(),
CopySize->getZExtValue(), C)) {
MD->removeInstruction(M);
M->eraseFromParent();
return true;
if (DepInfo.isClobber()) {
if (CallInst *C = dyn_cast<CallInst>(DepInfo.getInst())) {
if (performCallSlotOptzn(M, M->getDest(), M->getSource(),
CopySize->getZExtValue(), C)) {
MD->removeInstruction(M);
M->eraseFromParent();
return true;
}
}
}
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
AliasAnalysis::Location SrcLoc = AA.getLocationForSource(M);
MemDepResult SrcDepInfo = MD->getPointerDependencyFrom(SrcLoc, true,
M, M->getParent());
if (SrcDepInfo.isClobber()) {
if (MemCpyInst *MDep = dyn_cast<MemCpyInst>(SrcDepInfo.getInst()))
return processMemCpyMemCpyDependence(M, MDep, CopySize->getZExtValue());
}
return false;
}