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[msan] Workaround for invalid origins in shufflevector.

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Makes origin propagation ignore literal undef operands, and,
in general, any operand we don't have origin for.

https://code.google.com/p/memory-sanitizer/issues/detail?id=56


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210472 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2014-06-09 14:29:34 +00:00
parent 5b7ac8ba18
commit 24f5e55fce
2 changed files with 27 additions and 4 deletions
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12
lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -1302,10 +1302,14 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
if (!Origin) {
Origin = OpOrigin;
} else {
Value *FlatShadow = MSV->convertToShadowTyNoVec(OpShadow, IRB);
Value *Cond = IRB.CreateICmpNE(FlatShadow,
MSV->getCleanShadow(FlatShadow));
Origin = IRB.CreateSelect(Cond, OpOrigin, Origin);
Constant *ConstOrigin = dyn_cast<Constant>(OpOrigin);
// No point in adding something that might result in 0 origin value.
if (!ConstOrigin || !ConstOrigin->isNullValue()) {
Value *FlatShadow = MSV->convertToShadowTyNoVec(OpShadow, IRB);
Value *Cond =
IRB.CreateICmpNE(FlatShadow, MSV->getCleanShadow(FlatShadow));
Origin = IRB.CreateSelect(Cond, OpOrigin, Origin);
}
}
}
return *this;