[PATCH] D33225: [PowerPC] Fix a performance bug for PPC::XXSLDWI.

Mon May 15 19:05:17 PDT 2017

jtony created this revision.

  There are some VectorShuffle Nodes in SDAG which can be selected to XXSLDWI instruction,  this patch recognizes them and does the selection/mapping to improve the PPC performance.

https://reviews.llvm.org/D33225

Files:
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstrInfo.td
  lib/Target/PowerPC/PPCInstrVSX.td
  test/CodeGen/PowerPC/p8altivec-shuffles-pred.ll
  test/CodeGen/PowerPC/p9-xxinsertw-xxextractuw.ll
  test/CodeGen/PowerPC/pr27078.ll
  test/CodeGen/PowerPC/vec_sldwi.ll

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