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When looking for loop-invariant users, look through no-op instructions,

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so that an unfortunately placed bitcast doesn't pin a value in a
register.

llvm-svn: 100883
This commit is contained in:
Dan Gohman 2010-04-09 19:12:34 +00:00
parent f040734da3
commit 2ea51b7464
1 changed files with 11 additions and 3 deletions
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14
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1947,9 +1947,17 @@ LSRInstance::CollectLoopInvariantFixupsAndFormulae() {
continue;
// Ignore uses which are part of other SCEV expressions, to avoid
// analyzing them multiple times.
if (SE.isSCEVable(UserInst->getType()) &&
!isa<SCEVUnknown>(SE.getSCEV(const_cast<Instruction *>(UserInst))))
continue;
if (SE.isSCEVable(UserInst->getType())) {
const SCEV *UserS = SE.getSCEV(const_cast<Instruction *>(UserInst));
// If the user is a no-op, look through to its uses.
if (!isa<SCEVUnknown>(UserS))
continue;
if (UserS == U) {
Worklist.push_back(
SE.getUnknown(const_cast<Instruction *>(UserInst)));
continue;
}
}
// Ignore icmp instructions which are already being analyzed.
if (const ICmpInst *ICI = dyn_cast<ICmpInst>(UserInst)) {
unsigned OtherIdx = !UI.getOperandNo();