From e567b5b5267e10a18d1504a654b856c118208768 Mon Sep 17 00:00:00 2001 From: Ayal Zaks Date: Sun, 14 Oct 2018 17:53:02 +0000 Subject: [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 --- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'llvm/lib/Transforms/Vectorize/LoopVectorize.cpp') 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 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"); -- cgit v1.2.3