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Revert "Cleanup some SCEV logic a bit."

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This reverts commit 82cd8f7382322bee7a71cdc31f7a923c44d37d32.

Just add a comment instead!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177377 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-03-19 05:10:27 +00:00
parent 82cd8f7382
commit d37c8568e6
1 changed files with 3 additions and 4 deletions
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7
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2716,11 +2716,11 @@ void LSRInstance::GenerateIVChain(const IVChain &Chain, SCEVExpander &Rewriter,
// by LSR. // by LSR.
const IVInc &Head = Chain.Incs[0]; const IVInc &Head = Chain.Incs[0];
User::op_iterator IVOpEnd = Head.UserInst->op_end(); User::op_iterator IVOpEnd = Head.UserInst->op_end();
// findIVOperand returns IVOpEnd if it can no longer find a valid IV user.
User::op_iterator IVOpIter = findIVOperand(Head.UserInst->op_begin(), User::op_iterator IVOpIter = findIVOperand(Head.UserInst->op_begin(),
IVOpEnd, L, SE); IVOpEnd, L, SE);
assert(IVOpIter != IVOpEnd && "No IV operands found");
Value *IVSrc = 0; Value *IVSrc = 0;
do { while (IVOpIter != IVOpEnd) {
IVSrc = getWideOperand(*IVOpIter); IVSrc = getWideOperand(*IVOpIter);
// If this operand computes the expression that the chain needs, we may use // If this operand computes the expression that the chain needs, we may use
@ -2736,8 +2736,7 @@ void LSRInstance::GenerateIVChain(const IVChain &Chain, SCEVExpander &Rewriter,
break; break;
} }
IVOpIter = findIVOperand(llvm::next(IVOpIter), IVOpEnd, L, SE); IVOpIter = findIVOperand(llvm::next(IVOpIter), IVOpEnd, L, SE);
} while (IVOpIter != IVOpEnd); }
if (IVOpIter == IVOpEnd) { if (IVOpIter == IVOpEnd) {
// Gracefully give up on this chain. // Gracefully give up on this chain.
DEBUG(dbgs() << "Concealed chain head: " << *Head.UserInst << "\n"); DEBUG(dbgs() << "Concealed chain head: " << *Head.UserInst << "\n");