[llvm] r317481 - [X86][SSE] Combine EXTRACT_VECTOR_ELT with combineExtractWithShuffle before XFormVExtractWithShuffleIntoLoad
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Mon Nov 6 06:34:19 PST 2017
Author: rksimon
Date: Mon Nov 6 06:34:19 2017
New Revision: 317481
URL: http://llvm.org/viewvc/llvm-project?rev=317481&view=rev
Log:
[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.
Modified:
llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=317481&r1=317480&r2=317481&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Mon Nov 6 06:34:19 2017
@@ -30485,10 +30485,10 @@ static SDValue combineExtractWithShuffle
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);
More information about the llvm-commits
mailing list