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Cleanup some SCEV logic a bit.

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Make the code more obvious to scan-build and humans.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177375 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-03-19 04:14:59 +00:00
parent 4b02729558
commit 82cd8f7382
1 changed files with 4 additions and 2 deletions
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6
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2718,8 +2718,9 @@ void LSRInstance::GenerateIVChain(const IVChain &Chain, SCEVExpander &Rewriter,
User::op_iterator IVOpEnd = Head.UserInst->op_end();
User::op_iterator IVOpIter = findIVOperand(Head.UserInst->op_begin(),
IVOpEnd, L, SE);
assert(IVOpIter != IVOpEnd && "No IV operands found");
Value *IVSrc = 0;
while (IVOpIter != IVOpEnd) {
do {
IVSrc = getWideOperand(*IVOpIter);
// If this operand computes the expression that the chain needs, we may use
@ -2735,7 +2736,8 @@ void LSRInstance::GenerateIVChain(const IVChain &Chain, SCEVExpander &Rewriter,
break;
}
IVOpIter = findIVOperand(llvm::next(IVOpIter), IVOpEnd, L, SE);
}
} while (IVOpIter != IVOpEnd);
if (IVOpIter == IVOpEnd) {
// Gracefully give up on this chain.
DEBUG(dbgs() << "Concealed chain head: " << *Head.UserInst << "\n");