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SLPVectorize: Put horizontal reductions feeding a store under separate flag

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Put them under a separate flag for experimentation. They are more likely to
interfere with loop vectorization which happens later in the pass pipeline.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191371 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-09-25 14:02:32 +00:00
parent 259a6006e8
commit 9660ebb398
2 changed files with 28 additions and 21 deletions
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31
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -54,6 +54,11 @@ static cl::opt<bool>
ShouldVectorizeHor("slp-vectorize-hor", cl::init(false), cl::Hidden,
cl::desc("Attempt to vectorize horizontal reductions"));
static cl::opt<bool> ShouldStartVectorizeHorAtStore(
"slp-vectorize-hor-store", cl::init(false), cl::Hidden,
cl::desc(
"Attempt to vectorize horizontal reductions feeding into a store"));
namespace {
static const unsigned MinVecRegSize = 128;
@ -2336,20 +2341,20 @@ bool SLPVectorizer::vectorizeChainsInBlock(BasicBlock *BB, BoUpSLP &R) {
}
// Try to vectorize horizontal reductions feeding into a store.
if (StoreInst *SI = dyn_cast<StoreInst>(it))
if (BinaryOperator *BinOp =
dyn_cast<BinaryOperator>(SI->getValueOperand())) {
HorizontalReduction HorRdx;
if (ShouldVectorizeHor &&
((HorRdx.matchAssociativeReduction(0, BinOp, DL) &&
HorRdx.tryToReduce(R, TTI)) ||
tryToVectorize(BinOp, R))) {
Changed = true;
it = BB->begin();
e = BB->end();
continue;
if (ShouldStartVectorizeHorAtStore)
if (StoreInst *SI = dyn_cast<StoreInst>(it))
if (BinaryOperator *BinOp =
dyn_cast<BinaryOperator>(SI->getValueOperand())) {
HorizontalReduction HorRdx;
if (((HorRdx.matchAssociativeReduction(0, BinOp, DL) &&
HorRdx.tryToReduce(R, TTI)) ||
tryToVectorize(BinOp, R))) {
Changed = true;
it = BB->begin();
e = BB->end();
continue;
}
}
}
// Try to vectorize trees that start at compare instructions.
if (CmpInst *CI = dyn_cast<CmpInst>(it)) {