return true;
}
-
/// Make sure all Exit block PHINodes have required incoming values.
/// If incoming value is constant or defined outside the loop then
/// PHINode may not have an entry for new pre-header.
if (!PN)
break;
- if (PN->getBasicBlockIndex(NewPreHeader) == -1) {
- Value *V = PN->getIncomingValueForBlock(OrigHeader);
- if (isa<Constant>(V))
- PN->addIncoming(V, NewPreHeader);
- else {
- RenameData *ILoopHeaderInfo = findReplacementData(cast<Instruction>(V));
- assert (ILoopHeaderInfo && ILoopHeaderInfo->PreHeader && "Missing New Preheader Instruction");
- PN->addIncoming(ILoopHeaderInfo->PreHeader, NewPreHeader);
- }
+ // There is already one incoming value from new pre-header block.
+ if (PN->getBasicBlockIndex(NewPreHeader) != -1)
+ return;
+
+ RenameData *ILoopHeaderInfo;
+ Value *V = PN->getIncomingValueForBlock(OrigHeader);
+ if (isa<Instruction>(V) &&
+ (ILoopHeaderInfo = findReplacementData(cast<Instruction>(V)))) {
+ assert (ILoopHeaderInfo->PreHeader && "Missing New Preheader Instruction");
+ PN->addIncoming(ILoopHeaderInfo->PreHeader, NewPreHeader);
+ } else {
+ PN->addIncoming(V, NewPreHeader);
}
}
}
-
/// Initialize local data
void LoopRotate::initialize() {
L = NULL;