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Optimize code slightly. No functionality change.

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llvm-svn: 154307
This commit is contained in:
Craig Topper 2012-04-09 05:55:33 +00:00
parent adcb1f1d29
commit ee38217fe4
1 changed files with 7 additions and 6 deletions
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13
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -7723,12 +7723,13 @@ SDValue DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) {
SmallVector<int, 8> NewMask; SmallVector<int, 8> NewMask;
for (unsigned i = 0; i != NumElts; ++i) { for (unsigned i = 0; i != NumElts; ++i) {
int Idx = SVN->getMaskElt(i); int Idx = SVN->getMaskElt(i);
if (Idx < 0) if (Idx >= 0) {
NewMask.push_back(Idx); if (Idx < (int)NumElts)
else if (Idx < (int)NumElts) Idx += NumElts;
NewMask.push_back(Idx + NumElts); else
else Idx -= NumElts;
NewMask.push_back(Idx - NumElts); }
NewMask.push_back(Idx);
} }
return DAG.getVectorShuffle(VT, N->getDebugLoc(), N1, DAG.getUNDEF(VT), return DAG.getVectorShuffle(VT, N->getDebugLoc(), N1, DAG.getUNDEF(VT),
&NewMask[0]); &NewMask[0]);