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[InstCombine] Create zero constants on demand.

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No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235257 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2015-04-18 16:52:08 +00:00
parent c5edbea4e7
commit 339bc7faf0
1 changed files with 2 additions and 4 deletions
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lib/Transforms/InstCombine/InstCombineCasts.cpp
+2 -4
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@@ -1770,19 +1770,17 @@ Instruction *InstCombiner::visitBitCast(BitCastInst &CI) {
// If the source and destination are pointers, and this cast is equivalent
// to a getelementptr X, 0, 0, 0... turn it into the appropriate gep.
// This can enhance SROA and other transforms that want type-safe pointers.
Constant *ZeroUInt =
Constant::getNullValue(Type::getInt32Ty(CI.getContext()));
unsigned NumZeros = 0;
while (SrcElTy != DstElTy &&
isa<CompositeType>(SrcElTy) && !SrcElTy->isPointerTy() &&
SrcElTy->getNumContainedTypes() /* not "{}" */) {
SrcElTy = cast<CompositeType>(SrcElTy)->getTypeAtIndex(ZeroUInt);
SrcElTy = cast<CompositeType>(SrcElTy)->getTypeAtIndex(0U);
++NumZeros;
}
// If we found a path from the src to dest, create the getelementptr now.
if (SrcElTy == DstElTy) {
SmallVector<Value*, 8> Idxs(NumZeros+1, ZeroUInt);
SmallVector<Value *, 8> Idxs(NumZeros + 1, Builder->getInt32(0));
return GetElementPtrInst::CreateInBounds(Src, Idxs);
}
}