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SLPVectorizer: Add support for trees that don't start at binary operators, and add the cost of extracting values from the roots of the tree.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179475 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-04-14 05:15:53 +00:00
parent 618eda7a60
commit ab105ae95f
4 changed files with 62 additions and 7 deletions
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15
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -85,14 +85,16 @@ struct SLPVectorizer : public BasicBlockPass {
return true;
}
bool tryToVectorizePair(BinaryOperator *A, BinaryOperator *B, BoUpSLP &R) {
bool tryToVectorizePair(Value *A, Value *B, BoUpSLP &R) {
if (!A || !B) return false;
BoUpSLP::ValueList VL;
VL.push_back(A);
VL.push_back(B);
int Cost = R.getTreeCost(VL);
DEBUG(dbgs()<<"SLP: Cost of pair:" << Cost << ".\n");
if (Cost >= -SLPCostThreshold) return false;
int ExtrCost = R.getScalarizationCost(VL);
DEBUG(dbgs()<<"SLP: Cost of pair:" << Cost <<
" Cost of extract:" << ExtrCost << ".\n");
if ((Cost+ExtrCost) >= -SLPCostThreshold) return false;
DEBUG(dbgs()<<"SLP: Vectorizing pair.\n");
R.vectorizeArith(VL);
return true;
@ -100,11 +102,12 @@ struct SLPVectorizer : public BasicBlockPass {
bool tryToVectorizeCandidate(BinaryOperator *V, BoUpSLP &R) {
if (!V) return false;
// Try to vectorize V.
if (tryToVectorizePair(V->getOperand(0), V->getOperand(1), R))
return true;
BinaryOperator *A = dyn_cast<BinaryOperator>(V->getOperand(0));
BinaryOperator *B = dyn_cast<BinaryOperator>(V->getOperand(1));
// Try to vectorize V.
if (tryToVectorizePair(A, B, R)) return true;
// Try to skip B.
if (B && B->hasOneUse()) {
BinaryOperator *B0 = dyn_cast<BinaryOperator>(B->getOperand(0));