diff options
Diffstat (limited to 'lib/Transforms/Vectorize/LoopVectorize.cpp')
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 40235ef104..94e56a1713 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -75,6 +75,9 @@ static cl::opt<unsigned> VectorizationFactor("force-vector-width", cl::init(0), cl::Hidden, cl::desc("Set the default vectorization width. Zero is autoselect.")); +/// We don't vectorize loops with a known constant trip count below this number. +const int TinyTripCountThreshold = 16; + namespace { // Forward declarations. @@ -1147,7 +1150,7 @@ bool LoopVectorizationLegality::canVectorize() { // Do not loop-vectorize loops with a tiny trip count. unsigned TC = SE->getSmallConstantTripCount(TheLoop, BB); - if (TC > 0 && TC < 16) { + if (TC > 0 && TC < TinyTripCountThreshold) { DEBUG(dbgs() << "LV: Found a loop with a very small trip count. " << "This loop is not worth vectorizing.\n"); return false; |