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Handle last value assignments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2007-08-14 01:30:57 +00:00
parent ebcb52aa89
commit ada054a9ea
1 changed files with 42 additions and 14 deletions
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50
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@@ -419,8 +419,8 @@ bool LoopIndexSplit::processOneIterationLoop(SplitInfo &SD) {
}
BR->setUnconditionalDest(LatchSucc);
BasicBlock *Preheader = L->getLoopPreheader();
Instruction *Terminator = Header->getTerminator();
Value *ExitValue = ExitCondition->getOperand(ExitValueNum);
// Replace split condition in header.
// Transform
@@ -436,8 +436,7 @@ bool LoopIndexSplit::processOneIterationLoop(SplitInfo &SD) {
Terminator);
Instruction *C2 = new ICmpInst(SignedPredicate ?
ICmpInst::ICMP_SLT : ICmpInst::ICMP_ULT,
SD.SplitValue,
ExitCondition->getOperand(ExitValueNum), "lisplit",
SD.SplitValue, ExitValue, "lisplit",
Terminator);
Instruction *NSplitCond = BinaryOperator::createAnd(C1, C2, "lisplit",
Terminator);
@@ -454,6 +453,9 @@ bool LoopIndexSplit::processOneIterationLoop(SplitInfo &SD) {
if (isa<PHINode>(I) || I == LTerminator)
continue;
if (I == IndVarIncrement)
I->replaceAllUsesWith(ExitValue);
else
I->replaceAllUsesWith(UndefValue::get(I->getType()));
I->eraseFromParent();
}
@@ -485,7 +487,7 @@ bool LoopIndexSplit::safeHeader(SplitInfo &SD, BasicBlock *Header) {
BI != BE; ++BI) {
Instruction *I = BI;
// PHI Nodes are OK. FIXME : Handle last value assignments.
// PHI Nodes are OK.
if (isa<PHINode>(I))
continue;
@@ -520,7 +522,7 @@ bool LoopIndexSplit::safeExitBlock(SplitInfo &SD, BasicBlock *ExitBlock) {
BI != BE; ++BI) {
Instruction *I = BI;
// PHI Nodes are OK. FIXME : Handle last value assignments.
// PHI Nodes are OK.
if (isa<PHINode>(I))
continue;
@@ -686,23 +688,49 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
assert (ExitInsn && "Unable to find suitable loop exit branch");
BasicBlock *ExitDest = ExitInsn->getSuccessor(1);
if (L->contains(ExitDest)) {
ExitDest = ExitInsn->getSuccessor(0);
ExitInsn->setSuccessor(0, FalseHeader);
} else
ExitInsn->setSuccessor(1, FalseHeader);
// Collect inverse map of Header PHINodes.
DenseMap<Value *, Value *> InverseMap;
for (BasicBlock::iterator BI = L->getHeader()->begin(),
BE = L->getHeader()->end(); BI != BE; ++BI) {
if (PHINode *PN = dyn_cast<PHINode>(BI)) {
PHINode *PNClone = cast<PHINode>(ValueMap[PN]);
InverseMap[PNClone] = PN;
} else
break;
}
// Update False loop's header
for (BasicBlock::iterator BI = FalseHeader->begin(), BE = FalseHeader->end();
BI != BE; ++BI) {
if (PHINode *PN = dyn_cast<PHINode>(BI)) {
PN->removeIncomingValue(Preheader);
if (PN == IndVarClone)
PN->addIncoming(FLStartValue, ExitBlock);
// else { FIXME : Handl last value assignments.}
else {
PHINode *OrigPN = cast<PHINode>(InverseMap[PN]);
Value *V2 = OrigPN->getIncomingValueForBlock(ExitBlock);
PN->addIncoming(V2, ExitBlock);
}
else
} else
break;
}
if (L->contains(ExitDest)) {
ExitDest = ExitInsn->getSuccessor(0);
ExitInsn->setSuccessor(0, FalseHeader);
// Update ExitDest. Now it's predecessor is False loop's exit block.
BasicBlock *ExitBlockClone = cast<BasicBlock>(ValueMap[ExitBlock]);
for (BasicBlock::iterator BI = ExitDest->begin(), BE = ExitDest->end();
BI != BE; ++BI) {
if (PHINode *PN = dyn_cast<PHINode>(BI)) {
PN->addIncoming(ValueMap[PN->getIncomingValueForBlock(ExitBlock)], ExitBlockClone);
PN->removeIncomingValue(ExitBlock);
} else
ExitInsn->setSuccessor(1, FalseHeader);
break;
}
if (DT) {
DT->changeImmediateDominator(FalseHeader, ExitBlock);