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Vectorize a reduction chain feeding into a 'return' statement.

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e.x 
return (a[0]+b[0]) + (a[1]+b[1])

Differential Revision: http://reviews.llvm.org/D6227



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Suyog Sarda
2014-11-19 16:07:38 +00:00
parent 9fece51399
commit ca72befdb5
2 changed files with 69 additions and 0 deletions
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15
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -3696,6 +3696,21 @@ bool SLPVectorizer::vectorizeChainsInBlock(BasicBlock *BB, BoUpSLP &R) {
}
}
// Try to vectorize horizontal reductions feeding into a return.
if (ReturnInst *RI = dyn_cast<ReturnInst>(it))
if (RI->getNumOperands() != 0)
if (BinaryOperator *BinOp =
dyn_cast<BinaryOperator>(RI->getOperand(0))) {
DEBUG(dbgs() << "SLP: Found a return to vectorize.\n");
if (tryToVectorizePair(BinOp->getOperand(0),
BinOp->getOperand(1), 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)) {
if (tryToVectorizePair(CI->getOperand(0), CI->getOperand(1), R)) {