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Don't track users of undef values; they aren't interesting for

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register pressure.

llvm-svn: 105501
This commit is contained in:
Dan Gohman 2010-06-04 23:16:05 +00:00
parent 8e3fbf47cb
commit 17ad6b5d21
1 changed files with 5 additions and 1 deletions
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6
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2095,8 +2095,12 @@ LSRInstance::CollectLoopInvariantFixupsAndFormulae() {
} else if (const SCEVUnknown *U = dyn_cast<SCEVUnknown>(S)) {
if (!Inserted.insert(U)) continue;
const Value *V = U->getValue();
if (const Instruction *Inst = dyn_cast<Instruction>(V))
if (const Instruction *Inst = dyn_cast<Instruction>(V)) {
// Look for instructions defined outside the loop.
if (L->contains(Inst)) continue;
} else if (isa<UndefValue>(V))
// Undef doesn't have a live range, so it doesn't matter.
continue;
for (Value::const_use_iterator UI = V->use_begin(), UE = V->use_end();
UI != UE; ++UI) {
const Instruction *UserInst = dyn_cast<Instruction>(*UI);