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[X86][SSE] Combine EXTRACT_VECTOR_ELT with combineExtractWithShuffle before XFormVExtractWithShuffleIntoLoad 

combineExtractWithShuffle can handle more complex shuffles/bitcasts than we can with the equivalent code in XFormVExtractWithShuffleIntoLoad.

Mainly a compile time improvement now (combineExtractWithShuffle combines will have always failed late on inside XFormVExtractWithShuffleIntoLoad), and will let us merge combineExtractVectorElt_SSE in a future commit.

llvm-svn: 317481
This commit is contained in:
Simon Pilgrim 2017-11-06 14:34:19 +00:00
parent 13dc13ef09
commit 14450720e6
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -30485,10 +30485,10 @@ static SDValue combineExtractWithShuffle(SDNode *N, SelectionDAG &DAG,
static SDValue combineExtractVectorElt(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget &Subtarget) {
if (SDValue NewOp = XFormVExtractWithShuffleIntoLoad(N, DAG, DCI))
if (SDValue NewOp = combineExtractWithShuffle(N, DAG, DCI, Subtarget))
return NewOp;
if (SDValue NewOp = combineExtractWithShuffle(N, DAG, DCI, Subtarget))
if (SDValue NewOp = XFormVExtractWithShuffleIntoLoad(N, DAG, DCI))
return NewOp;
SDValue InputVector = N->getOperand(0);