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Revert "Teach the load analysis to allow finding available values which require" (r220277)

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This seems to have caused PR21330.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220349 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg
2014-10-21 23:49:52 +00:00
parent 8c4980b307
commit ec4e924836
7 changed files with 18 additions and 136 deletions
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14
lib/Analysis/Loads.cpp
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@@ -176,13 +176,8 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
Type *AccessTy = cast<PointerType>(Ptr->getType())->getElementType();
// Try to get the DataLayout for this module. This may be null, in which case
// the optimizations will be limited.
const DataLayout *DL = ScanBB->getDataLayout();
// Try to get the store size for the type.
uint64_t AccessSize = DL ? DL->getTypeStoreSize(AccessTy)
: AA ? AA->getTypeStoreSize(AccessTy) : 0;
// If we're using alias analysis to disambiguate get the size of *Ptr.
uint64_t AccessSize = AA ? AA->getTypeStoreSize(AccessTy) : 0;
Value *StrippedPtr = Ptr->stripPointerCasts();
@@ -207,7 +202,7 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
if (AreEquivalentAddressValues(
LI->getPointerOperand()->stripPointerCasts(), StrippedPtr) &&
CastInst::isBitOrNoopPointerCastable(LI->getType(), AccessTy, DL)) {
CastInst::isBitCastable(LI->getType(), AccessTy)) {
if (AATags)
LI->getAAMetadata(*AATags);
return LI;
@@ -219,8 +214,7 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
// (This is true even if the store is volatile or atomic, although
// those cases are unlikely.)
if (AreEquivalentAddressValues(StorePtr, StrippedPtr) &&
CastInst::isBitOrNoopPointerCastable(SI->getValueOperand()->getType(),
AccessTy, DL)) {
CastInst::isBitCastable(SI->getValueOperand()->getType(), AccessTy)) {
if (AATags)
SI->getAAMetadata(*AATags);
return SI->getOperand(0);