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[CGP, memcmp] replace CreateZextOrTrunc with CreateZext because it can never trunc

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305936 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2017-06-21 18:20:52 +00:00
parent 8c9101fe00
commit d8cbb8e87a
1 changed files with 7 additions and 5 deletions
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12
lib/CodeGen/CodeGenPrepare.cpp
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@ -1835,6 +1835,7 @@ Value *MemCmpExpansion::getCompareLoadPairs(unsigned Index, unsigned Size,
Type *LoadSizeType = IntegerType::get(CI->getContext(), LoadSize * 8);
Type *MaxLoadType = IntegerType::get(CI->getContext(), MaxLoadSize * 8);
assert(LoadSize <= MaxLoadSize && "Unexpected load type");
Value *Source1 = CI->getArgOperand(0);
Value *Source2 = CI->getArgOperand(1);
@ -1868,13 +1869,13 @@ Value *MemCmpExpansion::getCompareLoadPairs(unsigned Index, unsigned Size,
if (NumLoads != 1) {
if (LoadSizeType != MaxLoadType) {
LoadSrc1 = Builder.CreateZExtOrTrunc(LoadSrc1, MaxLoadType);
LoadSrc2 = Builder.CreateZExtOrTrunc(LoadSrc2, MaxLoadType);
LoadSrc1 = Builder.CreateZExt(LoadSrc1, MaxLoadType);
LoadSrc2 = Builder.CreateZExt(LoadSrc2, MaxLoadType);
}
// If we have multiple loads per block, we need to generate a composite
// comparison using xor+or.
Diff = Builder.CreateXor(LoadSrc1, LoadSrc2);
Diff = Builder.CreateZExtOrTrunc(Diff, MaxLoadType);
Diff = Builder.CreateZExt(Diff, MaxLoadType);
XorList.push_back(Diff);
} else {
// If there's only one load per block, we just compare the loaded values.
@ -1949,6 +1950,7 @@ void MemCmpExpansion::emitLoadCompareBlock(unsigned Index, unsigned LoadSize,
Type *LoadSizeType = IntegerType::get(CI->getContext(), LoadSize * 8);
Type *MaxLoadType = IntegerType::get(CI->getContext(), MaxLoadSize * 8);
assert(LoadSize <= MaxLoadSize && "Unexpected load type");
Value *Source1 = CI->getArgOperand(0);
Value *Source2 = CI->getArgOperand(1);
@ -1982,8 +1984,8 @@ void MemCmpExpansion::emitLoadCompareBlock(unsigned Index, unsigned LoadSize,
}
if (LoadSizeType != MaxLoadType) {
LoadSrc1 = Builder.CreateZExtOrTrunc(LoadSrc1, MaxLoadType);
LoadSrc2 = Builder.CreateZExtOrTrunc(LoadSrc2, MaxLoadType);
LoadSrc1 = Builder.CreateZExt(LoadSrc1, MaxLoadType);
LoadSrc2 = Builder.CreateZExt(LoadSrc2, MaxLoadType);
}
// Add the loaded values to the phi nodes for calculating memcmp result only