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Fix phi translation in load PRE to agree with the phi

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translation done by memdep, and reenable gep translation 
again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89992 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-11-27 06:31:14 +00:00
parent b99be5beac
commit 62deff066c
4 changed files with 31 additions and 12 deletions
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14
lib/Analysis/MemoryDependenceAnalysis.cpp
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@@ -700,7 +700,6 @@ static bool isPHITranslatable(Instruction *Inst) {
// We can translate a GEP that uses a PHI in the current block for at least
// one of its operands.
if (0)
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Inst)) {
for (unsigned i = 0, e = GEP->getNumOperands(); i != e; ++i)
if (PHINode *PN = dyn_cast<PHINode>(GEP->getOperand(i)))
@@ -718,8 +717,15 @@ static bool isPHITranslatable(Instruction *Inst) {
/// PHITranslateForPred - Given a computation that satisfied the
/// isPHITranslatable predicate, see if we can translate the computation into
/// the specified predecessor block. If so, return that value.
static Value *PHITranslateForPred(Instruction *Inst, BasicBlock *Pred,
const TargetData *TD) {
Value *MemoryDependenceAnalysis::
PHITranslatePointer(Value *InVal, BasicBlock *CurBB, BasicBlock *Pred,
const TargetData *TD) const {
// If the input value is not an instruction, or if it is not defined in CurBB,
// then we don't need to phi translate it.
Instruction *Inst = dyn_cast<Instruction>(InVal);
if (Inst == 0 || Inst->getParent() != CurBB)
return InVal;
if (PHINode *PN = dyn_cast<PHINode>(Inst))
return PN->getIncomingValueForBlock(Pred);
@@ -931,7 +937,7 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
for (BasicBlock **PI = PredCache->GetPreds(BB); *PI; ++PI) {
BasicBlock *Pred = *PI;
Value *PredPtr = PHITranslateForPred(PtrInst, Pred, TD);
Value *PredPtr = PHITranslatePointer(PtrInst, BB, Pred, TD);
// If PHI translation fails, bail out.
if (PredPtr == 0)