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Don't remove the memcpy when call slot substitution fails.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51848 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2008-06-01 21:52:16 +00:00
parent 6bd15ce03f
commit 12cb36c115
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@@ -580,14 +580,19 @@ bool MemCpyOpt::performCallSlotOptzn(MemCpyInst *cpy, CallInst *C) {
return false; return false;
// All the checks have passed, so do the transformation. // All the checks have passed, so do the transformation.
bool changedArgument = false;
for (unsigned i = 0; i < CS.arg_size(); ++i) for (unsigned i = 0; i < CS.arg_size(); ++i)
if (CS.getArgument(i) == cpySrc) { if (CS.getArgument(i) == cpySrc) {
if (cpySrc->getType() != cpyDest->getType()) if (cpySrc->getType() != cpyDest->getType())
cpyDest = CastInst::CreatePointerCast(cpyDest, cpySrc->getType(), cpyDest = CastInst::CreatePointerCast(cpyDest, cpySrc->getType(),
cpyDest->getName(), C); cpyDest->getName(), C);
changedArgument = true;
CS.setArgument(i, cpyDest); CS.setArgument(i, cpyDest);
} }
if (!changedArgument)
return false;
// Drop any cached information about the call, because we may have changed // Drop any cached information about the call, because we may have changed
// its dependence information by changing its parameter. // its dependence information by changing its parameter.
MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>(); MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>();