diff options
| -rw-r--r-- | llvm/lib/Transforms/Vectorize/LoopVectorize.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp index e93cfb34156..2ba2f00b4a5 100644 --- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -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"); |
