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[GVN] Address review comments for D18662

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As suggested by Chandler in his review comments for D18662, this
follow-on patch renames some variables in GetLoadValueForLoad and
CoerceAvailableValueToLoadType to hopefully make it more obvious
which variables hold value sizes and which hold load/store sizes.

No functional change intended.

llvm-svn: 265687
This commit is contained in:
Ulrich Weigand 2016-04-07 15:55:11 +00:00
parent 9b67f2029f
commit bf2fa50c24
1 changed files with 10 additions and 9 deletions
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19
lib/Transforms/Scalar/GVN.cpp
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@ -725,11 +725,11 @@ static Value *CoerceAvailableValueToLoadType(Value *StoredVal, Type *LoadedTy,
// If this is already the right type, just return it.
Type *StoredValTy = StoredVal->getType();
uint64_t StoreSize = DL.getTypeSizeInBits(StoredValTy);
uint64_t LoadSize = DL.getTypeSizeInBits(LoadedTy);
uint64_t StoredValSize = DL.getTypeSizeInBits(StoredValTy);
uint64_t LoadedValSize = DL.getTypeSizeInBits(LoadedTy);
// If the store and reload are the same size, we can always reuse it.
if (StoreSize == LoadSize) {
if (StoredValSize == LoadedValSize) {
// Pointer to Pointer -> use bitcast.
if (StoredValTy->getScalarType()->isPointerTy() &&
LoadedTy->getScalarType()->isPointerTy())
@ -758,7 +758,8 @@ static Value *CoerceAvailableValueToLoadType(Value *StoredVal, Type *LoadedTy,
// If the loaded value is smaller than the available value, then we can
// extract out a piece from it. If the available value is too small, then we
// can't do anything.
assert(StoreSize >= LoadSize && "CanCoerceMustAliasedValueToLoad fail");
assert(StoredValSize >= LoadedValSize &&
"CanCoerceMustAliasedValueToLoad fail");
// Convert source pointers to integers, which can be manipulated.
if (StoredValTy->getScalarType()->isPointerTy()) {
@ -768,7 +769,7 @@ static Value *CoerceAvailableValueToLoadType(Value *StoredVal, Type *LoadedTy,
// Convert vectors and fp to integer, which can be manipulated.
if (!StoredValTy->isIntegerTy()) {
StoredValTy = IntegerType::get(StoredValTy->getContext(), StoreSize);
StoredValTy = IntegerType::get(StoredValTy->getContext(), StoredValSize);
StoredVal = IRB.CreateBitCast(StoredVal, StoredValTy);
}
@ -781,7 +782,7 @@ static Value *CoerceAvailableValueToLoadType(Value *StoredVal, Type *LoadedTy,
}
// Truncate the integer to the right size now.
Type *NewIntTy = IntegerType::get(StoredValTy->getContext(), LoadSize);
Type *NewIntTy = IntegerType::get(StoredValTy->getContext(), LoadedValSize);
StoredVal = IRB.CreateTrunc(StoredVal, NewIntTy, "trunc");
if (LoadedTy == NewIntTy)
@ -1024,9 +1025,9 @@ static Value *GetLoadValueForLoad(LoadInst *SrcVal, unsigned Offset,
const DataLayout &DL = SrcVal->getModule()->getDataLayout();
// If Offset+LoadTy exceeds the size of SrcVal, then we must be wanting to
// widen SrcVal out to a larger load.
unsigned SrcValSize = DL.getTypeStoreSize(SrcVal->getType());
unsigned SrcValStoreSize = DL.getTypeStoreSize(SrcVal->getType());
unsigned LoadSize = DL.getTypeStoreSize(LoadTy);
if (Offset+LoadSize > SrcValSize) {
if (Offset+LoadSize > SrcValStoreSize) {
assert(SrcVal->isSimple() && "Cannot widen volatile/atomic load!");
assert(SrcVal->getType()->isIntegerTy() && "Can't widen non-integer load");
// If we have a load/load clobber an DepLI can be widened to cover this
@ -1058,7 +1059,7 @@ static Value *GetLoadValueForLoad(LoadInst *SrcVal, unsigned Offset,
// system, we need to shift down to get the relevant bits.
Value *RV = NewLoad;
if (DL.isBigEndian())
RV = Builder.CreateLShr(RV, (NewLoadSize - SrcValSize) * 8);
RV = Builder.CreateLShr(RV, (NewLoadSize - SrcValStoreSize) * 8);
RV = Builder.CreateTrunc(RV, SrcVal->getType());
SrcVal->replaceAllUsesWith(RV);