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make various clients of ReplaceAndSimplifyAllUses tolerate

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it *changing* the things it replaces, not just causing them
to drop to null.  There is no functionality change yet, but 
this is required for a subsequent patch.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108414 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-07-15 06:06:04 +00:00
parent 75a5b71208
commit 35a939b97d
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/Utils/Local.cpp
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@ -306,7 +306,7 @@ bool llvm::SimplifyInstructionsInBlock(BasicBlock *BB, const TargetData *TD) {
WeakVH BIHandle(BI);
ReplaceAndSimplifyAllUses(Inst, V, TD);
MadeChange = true;
if (BIHandle == 0)
if (BIHandle != BI)
BI = BB->begin();
continue;
}
@ -354,12 +354,13 @@ void llvm::RemovePredecessorAndSimplify(BasicBlock *BB, BasicBlock *Pred,
// value into all of its uses.
assert(PNV != PN && "hasConstantValue broken");
Value *OldPhiIt = PhiIt;
ReplaceAndSimplifyAllUses(PN, PNV, TD);
// If recursive simplification ended up deleting the next PHI node we would
// iterate to, then our iterator is invalid, restart scanning from the top
// of the block.
if (PhiIt == 0) PhiIt = &BB->front();
if (PhiIt != OldPhiIt) PhiIt = &BB->front();
}
}