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Do not reserve DOM check for GetElementPtrInst.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42306 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-09-25 17:55:50 +00:00
parent 2246bb6011
commit 798b4afd48
1 changed files with 23 additions and 22 deletions
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45
lib/Transforms/Scalar/LICM.cpp
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@ -811,30 +811,31 @@ void LICM::FindPromotableValuesInLoop(
// condition which may not yet folded.
if (isa<ConstantPointerNull>(GEP->getOperand(0)))
PointerOk = false;
// If GEP is use is not dominating loop exit then promoting
// GEP may expose unsafe load and store instructions unconditinally.
if (PointerOk)
for(Value::use_iterator UI = V->use_begin(), UE = V->use_end();
UI != UE && PointerOk; ++UI) {
Instruction *Use = dyn_cast<Instruction>(*UI);
if (!Use)
continue;
for (SmallVector<Instruction *, 4>::iterator
ExitI = LoopExits.begin(), ExitE = LoopExits.end();
ExitI != ExitE; ++ExitI) {
Instruction *Ex = *ExitI;
if (!DT->dominates(Use, Ex)){
PointerOk = false;
break;
}
}
if (!PointerOk)
break;
}
}
// If value V use is not dominating loop exit then promoting
// it may expose unsafe load and store instructions unconditinally.
if (PointerOk)
for(Value::use_iterator UI = V->use_begin(), UE = V->use_end();
UI != UE && PointerOk; ++UI) {
Instruction *Use = dyn_cast<Instruction>(*UI);
if (!Use || !CurLoop->contains(Use->getParent()))
continue;
for (SmallVector<Instruction *, 4>::iterator
ExitI = LoopExits.begin(), ExitE = LoopExits.end();
ExitI != ExitE; ++ExitI) {
Instruction *Ex = *ExitI;
if (!DT->dominates(Use, Ex)){
PointerOk = false;
break;
}
}
if (!PointerOk)
break;
}
if (PointerOk) {
const Type *Ty = cast<PointerType>(V->getType())->getElementType();
AllocaInst *AI = new AllocaInst(Ty, 0, V->getName()+".tmp", FnStart);