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Reapply r97010, the speculative revert failed.

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llvm-svn: 97036
This commit is contained in:
Daniel Dunbar 2010-02-24 08:48:04 +00:00
parent fb5e88009e
commit 8adb7774dc
4 changed files with 37 additions and 50 deletions
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18
include/llvm/Analysis/PHITransAddr.h
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@ -66,9 +66,11 @@ public:
bool IsPotentiallyPHITranslatable() const;
/// PHITranslateValue - PHI translate the current address up the CFG from
/// CurBB to Pred, updating our state the reflect any needed changes. This
/// returns true on failure and sets Addr to null.
bool PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB);
/// CurBB to Pred, updating our state to reflect any needed changes. If the
/// dominator tree DT is non-null, the translated value must dominate
/// PredBB. This returns true on failure and sets Addr to null.
bool PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB,
const DominatorTree *DT);
/// PHITranslateWithInsertion - PHI translate this value into the specified
/// predecessor block, inserting a computation of the value if it is
@ -88,14 +90,8 @@ public:
/// returns false.
bool Verify() const;
private:
Value *PHITranslateSubExpr(Value *V, BasicBlock *CurBB, BasicBlock *PredBB);
/// GetAvailablePHITranslatedSubExpr - Return the value computed by
/// PHITranslateSubExpr if it dominates PredBB, otherwise return null.
Value *GetAvailablePHITranslatedSubExpr(Value *V,
BasicBlock *CurBB, BasicBlock *PredBB,
const DominatorTree &DT) const;
Value *PHITranslateSubExpr(Value *V, BasicBlock *CurBB, BasicBlock *PredBB,
const DominatorTree *DT);
/// InsertPHITranslatedSubExpr - Insert a computation of the PHI translated
/// version of 'V' for the edge PredBB->CurBB into the end of the PredBB

2
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -861,7 +861,7 @@ getNonLocalPointerDepFromBB(const PHITransAddr &Pointer, uint64_t PointeeSize,
// Get the PHI translated pointer in this predecessor. This can fail if
// not translatable, in which case the getAddr() returns null.
PHITransAddr PredPointer(Pointer);
PredPointer.PHITranslateValue(BB, Pred);
PredPointer.PHITranslateValue(BB, Pred, 0);
Value *PredPtrVal = PredPointer.getAddr();

60
lib/Analysis/PHITransAddr.cpp
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@ -134,7 +134,8 @@ static void RemoveInstInputs(Value *V,
}
Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
BasicBlock *PredBB) {
BasicBlock *PredBB,
const DominatorTree *DT) {
// If this is a non-instruction value, it can't require PHI translation.
Instruction *Inst = dyn_cast<Instruction>(V);
if (Inst == 0) return V;
@ -177,7 +178,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
// operands need to be phi translated, and if so, reconstruct it.
if (BitCastInst *BC = dyn_cast<BitCastInst>(Inst)) {
Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB);
Value *PHIIn = PHITranslateSubExpr(BC->getOperand(0), CurBB, PredBB, DT);
if (PHIIn == 0) return 0;
if (PHIIn == BC->getOperand(0))
return BC;
@ -193,7 +194,8 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
for (Value::use_iterator UI = PHIIn->use_begin(), E = PHIIn->use_end();
UI != E; ++UI) {
if (BitCastInst *BCI = dyn_cast<BitCastInst>(*UI))
if (BCI->getType() == BC->getType())
if (BCI->getType() == BC->getType() &&
(!DT || DT->dominates(BCI->getParent(), PredBB)))
return BCI;
}
return 0;
@ -204,7 +206,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
SmallVector<Value*, 8> GEPOps;
bool AnyChanged = false;
for (unsigned i = 0, e = GEP->getNumOperands(); i != e; ++i) {
Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB);
Value *GEPOp = PHITranslateSubExpr(GEP->getOperand(i), CurBB, PredBB, DT);
if (GEPOp == 0) return 0;
AnyChanged |= GEPOp != GEP->getOperand(i);
@ -229,7 +231,8 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(*UI))
if (GEPI->getType() == GEP->getType() &&
GEPI->getNumOperands() == GEPOps.size() &&
GEPI->getParent()->getParent() == CurBB->getParent()) {
GEPI->getParent()->getParent() == CurBB->getParent() &&
(!DT || DT->dominates(GEPI->getParent(), PredBB))) {
bool Mismatch = false;
for (unsigned i = 0, e = GEPOps.size(); i != e; ++i)
if (GEPI->getOperand(i) != GEPOps[i]) {
@ -251,7 +254,7 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
bool isNSW = cast<BinaryOperator>(Inst)->hasNoSignedWrap();
bool isNUW = cast<BinaryOperator>(Inst)->hasNoUnsignedWrap();
Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB);
Value *LHS = PHITranslateSubExpr(Inst->getOperand(0), CurBB, PredBB, DT);
if (LHS == 0) return 0;
// If the PHI translated LHS is an add of a constant, fold the immediates.
@ -287,7 +290,8 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*UI))
if (BO->getOpcode() == Instruction::Add &&
BO->getOperand(0) == LHS && BO->getOperand(1) == RHS &&
BO->getParent()->getParent() == CurBB->getParent())
BO->getParent()->getParent() == CurBB->getParent() &&
(!DT || DT->dominates(BO->getParent(), PredBB)))
return BO;
}
@ -300,34 +304,25 @@ Value *PHITransAddr::PHITranslateSubExpr(Value *V, BasicBlock *CurBB,
/// PHITranslateValue - PHI translate the current address up the CFG from
/// CurBB to Pred, updating our state the reflect any needed changes. This
/// returns true on failure and sets Addr to null.
bool PHITransAddr::PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB) {
/// CurBB to Pred, updating our state to reflect any needed changes. If the
/// dominator tree DT is non-null, the translated value must dominate
/// PredBB. This returns true on failure and sets Addr to null.
bool PHITransAddr::PHITranslateValue(BasicBlock *CurBB, BasicBlock *PredBB,
const DominatorTree *DT) {
assert(Verify() && "Invalid PHITransAddr!");
Addr = PHITranslateSubExpr(Addr, CurBB, PredBB);
Addr = PHITranslateSubExpr(Addr, CurBB, PredBB, DT);
assert(Verify() && "Invalid PHITransAddr!");
if (DT) {
// Make sure the value is live in the predecessor.
if (Instruction *Inst = dyn_cast_or_null<Instruction>(Addr))
if (!DT->dominates(Inst->getParent(), PredBB))
Addr = 0;
}
return Addr == 0;
}
/// GetAvailablePHITranslatedSubExpr - Return the value computed by
/// PHITranslateSubExpr if it dominates PredBB, otherwise return null.
Value *PHITransAddr::
GetAvailablePHITranslatedSubExpr(Value *V, BasicBlock *CurBB,BasicBlock *PredBB,
const DominatorTree &DT) const {
PHITransAddr Tmp(V, TD);
Tmp.PHITranslateValue(CurBB, PredBB);
// See if PHI translation succeeds.
V = Tmp.getAddr();
// Make sure the value is live in the predecessor.
if (Instruction *Inst = dyn_cast_or_null<Instruction>(V))
if (!DT.dominates(Inst->getParent(), PredBB))
return 0;
return V;
}
/// PHITranslateWithInsertion - PHI translate this value into the specified
/// predecessor block, inserting a computation of the value if it is
/// unavailable.
@ -365,8 +360,9 @@ InsertPHITranslatedSubExpr(Value *InVal, BasicBlock *CurBB,
SmallVectorImpl<Instruction*> &NewInsts) {
// See if we have a version of this value already available and dominating
// PredBB. If so, there is no need to insert a new instance of it.
if (Value *Res = GetAvailablePHITranslatedSubExpr(InVal, CurBB, PredBB, DT))
return Res;
PHITransAddr Tmp(InVal, TD);
if (!Tmp.PHITranslateValue(CurBB, PredBB, &DT))
return Tmp.getAddr();
// If we don't have an available version of this value, it must be an
// instruction.

7
lib/Transforms/Scalar/GVN.cpp
View File

@ -1633,13 +1633,8 @@ bool GVN::processNonLocalLoad(LoadInst *LI,
LoadPtr = Address.PHITranslateWithInsertion(LoadBB, UnavailablePred,
*DT, NewInsts);
} else {
Address.PHITranslateValue(LoadBB, UnavailablePred);
Address.PHITranslateValue(LoadBB, UnavailablePred, DT);
LoadPtr = Address.getAddr();
// Make sure the value is live in the predecessor.
if (Instruction *Inst = dyn_cast_or_null<Instruction>(LoadPtr))
if (!DT->dominates(Inst->getParent(), UnavailablePred))
LoadPtr = 0;
}
// If we couldn't find or insert a computation of this phi translated value,