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LoopVectorizer: Use the "optsize" attribute to decide if we are allowed to increase the function size.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170004 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-12 19:29:45 +00:00
parent 349c2787cf
commit ae3b652f5c
6 changed files with 185 additions and 10 deletions
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17
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -53,10 +53,8 @@ namespace {
struct LoopVectorize : public LoopPass {
/// Pass identification, replacement for typeid
static char ID;
/// Optimize for size. Do not generate tail loops.
bool OptForSize;
explicit LoopVectorize(bool OptSz = false) : LoopPass(ID), OptForSize(OptSz) {
explicit LoopVectorize() : LoopPass(ID) {
initializeLoopVectorizePass(*PassRegistry::getPassRegistry());
}
@ -93,8 +91,15 @@ struct LoopVectorize : public LoopPass {
VTTI = TTI->getVectorTargetTransformInfo();
// Use the cost model.
LoopVectorizationCostModel CM(L, SE, &LVL, VTTI);
// Check the function attribues to find out if this function should be
// optimized for size.
Function *F = L->getHeader()->getParent();
bool OptForSize =
F->getFnAttributes().hasAttribute(Attributes::OptimizeForSize);
unsigned VF = CM.selectVectorizationFactor(OptForSize,
VectorizationFactor);
VectorizationFactor);
if (VF == 1) {
DEBUG(dbgs() << "LV: Vectorization is possible but not beneficial.\n");
@ -2159,8 +2164,8 @@ INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
INITIALIZE_PASS_END(LoopVectorize, LV_NAME, lv_name, false, false)
namespace llvm {
Pass *createLoopVectorizePass(bool OptForSize = false) {
return new LoopVectorize(OptForSize);
Pass *createLoopVectorizePass() {
return new LoopVectorize();
}
}