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[LV] Fix comments reported when not vectorizing single iteration loops; NFC 

Landing this as a separate part of https://reviews.llvm.org/D50480, being a
seemingly unrelated change ([LV] Vectorizing loops of arbitrary trip count
without remainder under opt for size).

llvm-svn: 344483
This commit is contained in:
Ayal Zaks 2018-10-14 17:53:02 +00:00
parent 61471cc090
commit e567b5b526
1 changed files with 8 additions and 1 deletions
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9
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -4558,8 +4558,15 @@ Optional<unsigned> LoopVectorizationCostModel::computeMaxVF(bool OptForSize) {
// If we optimize the program for size, avoid creating the tail loop.
LLVM_DEBUG(dbgs() << "LV: Found trip count: " << TC << '\n');
if (TC == 1) {
ORE->emit(createMissedAnalysis("SingleIterationLoop")
<< "loop trip count is one, irrelevant for vectorization");
LLVM_DEBUG(dbgs() << "LV: Aborting, single iteration (non) loop.\n");
return None;
}
// If we don't know the precise trip count, don't try to vectorize.
if (TC < 2) {
if (TC == 0) {
ORE->emit(
createMissedAnalysis("UnknownLoopCountComplexCFG")
<< "unable to calculate the loop count due to complex control flow");