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Put the threshold magic number in a variable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167134 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-10-31 16:22:16 +00:00
parent f772f07802
commit 4c1b4b1fe7
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -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;