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Use Duncan's patch to delete the instructions in reverse order (minus the landingpad and terminator).

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llvm-svn: 139090
This commit is contained in:
Bill Wendling 2011-09-04 09:43:36 +00:00
parent dbea8de893
commit 0506959970
2 changed files with 20 additions and 12 deletions
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16
lib/Transforms/InstCombine/InstructionCombining.cpp
View File

@ -1574,15 +1574,19 @@ bool InstCombiner::DoOneIteration(Function &F, unsigned Iteration) {
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
if (Visited.count(BB)) continue;
// Delete the instructions.
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
Instruction *Inst = &*I++;
if (isa<TerminatorInst>(Inst))
break;
// Delete the instructions backwards, as it has a reduced likelihood of
// having to update as many def-use and use-def chains.
Instruction *EndInst = BB->getTerminator(); // Last not to be deleted.
while (EndInst != BB->begin()) {
// Delete the next to last instruction.
BasicBlock::iterator I = EndInst;
Instruction *Inst = --I;
if (!Inst->use_empty())
Inst->replaceAllUsesWith(UndefValue::get(Inst->getType()));
if (isa<LandingPadInst>(Inst))
if (isa<LandingPadInst>(Inst)) {
EndInst = Inst;
continue;
}
if (!isa<DbgInfoIntrinsic>(Inst)) {
++NumDeadInst;
MadeIRChange = true;

16
lib/Transforms/Scalar/SCCP.cpp
View File

@ -1686,15 +1686,19 @@ static void DeleteInstructionInBlock(BasicBlock *BB) {
if (isa<TerminatorInst>(BB->begin()))
return;
// Delete the instructions.
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
Instruction *Inst = &*I++;
if (isa<TerminatorInst>(Inst))
break;
// Delete the instructions backwards, as it has a reduced likelihood of having
// to update as many def-use and use-def chains.
Instruction *EndInst = BB->getTerminator(); // Last not to be deleted.
while (EndInst != BB->begin()) {
// Delete the next to last instruction.
BasicBlock::iterator I = EndInst;
Instruction *Inst = --I;
if (!Inst->use_empty())
Inst->replaceAllUsesWith(UndefValue::get(Inst->getType()));
if (isa<LandingPadInst>(Inst))
if (isa<LandingPadInst>(Inst)) {
EndInst = Inst;
continue;
}
BB->getInstList().erase(Inst);
++NumInstRemoved;
}