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[CGP] pass size as param in MemCmpExpansion; NFCI

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Avoid extracting the constant int twice.

llvm-svn: 304917
This commit is contained in:
Sanjay Patel 2017-06-07 14:45:49 +00:00
parent d73630f05c
commit de78301a10
1 changed files with 8 additions and 13 deletions
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21
lib/CodeGen/CodeGenPrepare.cpp
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@ -1681,7 +1681,7 @@ class MemCmpExpansion {
public:
MemCmpExpansion(CallInst *CI, unsigned MaxLoadSize,
unsigned NumLoadsPerBlock);
Value *getMemCmpExpansion(bool IsLittleEndian);
Value *getMemCmpExpansion(uint64_t Size, bool IsLittleEndian);
};
MemCmpExpansion::ResultBlock::ResultBlock()
@ -2077,24 +2077,19 @@ Value *MemCmpExpansion::getMemCmpExpansionZeroCase(unsigned Size,
// This function expands the memcmp call into an inline expansion and returns
// the memcmp result.
Value *MemCmpExpansion::getMemCmpExpansion(bool IsLittleEndian) {
ConstantInt *SizeCast = dyn_cast<ConstantInt>(CI->getArgOperand(2));
uint64_t Size = SizeCast->getZExtValue();
int LoadSize = MaxLoadSize;
int NumBytesToBeProcessed = Size;
Value *MemCmpExpansion::getMemCmpExpansion(uint64_t Size, bool IsLittleEndian) {
if (IsUsedForZeroCmp)
return getMemCmpExpansionZeroCase(Size, IsLittleEndian);
unsigned Index = 0;
// This loop calls emitLoadCompareBlock for comparing SizeVal bytes of the two
// This loop calls emitLoadCompareBlock for comparing Size bytes of the two
// memcmp sources. It starts with loading using the maximum load size set by
// the target. It processes any remaining bytes using a load size which is the
// next smallest power of 2.
int LoadSize = MaxLoadSize;
int NumBytesToBeProcessed = Size;
unsigned Index = 0;
while (NumBytesToBeProcessed) {
// Calculate how many blocks we can create with the current load size
// Calculate how many blocks we can create with the current load size.
int NumBlocks = NumBytesToBeProcessed / LoadSize;
int GEPIndex = (Size - NumBytesToBeProcessed) / LoadSize;
NumBytesToBeProcessed = NumBytesToBeProcessed % LoadSize;
@ -2233,7 +2228,7 @@ static bool expandMemCmp(CallInst *CI, const TargetTransformInfo *TTI,
unsigned NumLoadsPerBlock = MemCmpNumLoadsPerBlock;
MemCmpExpansion MemCmpHelper(CI, MaxLoadSize, NumLoadsPerBlock);
Value *Res = MemCmpHelper.getMemCmpExpansion(DL->isLittleEndian());
Value *Res = MemCmpHelper.getMemCmpExpansion(SizeVal, DL->isLittleEndian());
// Replace call with result of expansion and erase call.
CI->replaceAllUsesWith(Res);