diff options
| -rw-r--r-- | contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp index 531d349..c1e8df9 100644 --- a/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/contrib/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -3466,6 +3466,15 @@ bool LoopVectorizationLegality::canVectorize() { return false; } + // We only handle bottom-tested loops, i.e. loop in which the condition is + // checked at the end of each iteration. With that we can assume that all + // instructions in the loop are executed the same number of times. + if (TheLoop->getExitingBlock() != TheLoop->getLoopLatch()) { + emitAnalysis( + Report() << "loop control flow is not understood by vectorizer"); + return false; + } + // We need to have a loop header. DEBUG(dbgs() << "LV: Found a loop: " << TheLoop->getHeader()->getName() << '\n'); |
