[llvm] r317481 - [X86][SSE] Combine EXTRACT_VECTOR_ELT with combineExtractWithShuffle before XFormVExtractWithShuffleIntoLoad

[Simon Pilgrim via llvm-commits]

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);