[PATCH] [PPC64LE] Remove unnecessary swaps from lane-insensitive vector computations

[Bill Schmidt]

OK, I've attempted to address all comments.  The biggest change is adding an InstrMapping to PPC.td to record which instructions kill the swap removal optimization, rather then just listing them in the switch statement.  It is a bit ugly to use a mapping to represent a set, but it appears to be the only option for doing this via TableGen.  Let me know if you have any better suggestions.

Thanks again for the thorough reviews!

Bill


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8565

Files:
  lib/Target/PowerPC/CMakeLists.txt
  lib/Target/PowerPC/PPC.h
  lib/Target/PowerPC/PPC.td
  lib/Target/PowerPC/PPCInstrAltivec.td
  lib/Target/PowerPC/PPCInstrVSX.td
  lib/Target/PowerPC/PPCTargetMachine.cpp
  lib/Target/PowerPC/PPCVSXSwapRemoval.cpp
  test/CodeGen/PowerPC/swaps-le-1.ll
  test/CodeGen/PowerPC/vsx-ldst-builtin-le.ll
  test/CodeGen/PowerPC/vsx-ldst.ll

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