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.
// 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;