[PATCH] D21148: [X86][SSE] Added support for combining target shuffles to (V)PSHUFD/VPERMILPD/VPERMILPS immediate permute

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: qcolombet, ab, spatel, andreadb.
RKSimon added a subscriber: llvm-commits.
RKSimon set the repository for this revision to rL LLVM.

This patch allows target shuffles to be combined to single input immediate permute instructions - (V)PSHUFD/VPERMILPD/VPERMILPS - allowing more general pattern matching than what we current do and improves the likelihood of memory folding compared to existing patterns which tend to reuse the input in multiple arguments. 

Further permute instructions (V)PSHUFLW/(V)PSHUFHW/(V)PERMQ/(V)PERMPD may be added in the future but its proven tricky to create tests cases for them so far. (V)PSHUFLW/(V)PSHUFHW is already handled quite well in combineTargetShuffle so it may be that removing some of that code may allow us to perform more of the combining in one place without duplication.

Repository:
  rL LLVM

http://reviews.llvm.org/D21148

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/2012-01-12-extract-sv.ll
  test/CodeGen/X86/2012-04-26-sdglue.ll
  test/CodeGen/X86/avx-intrinsics-fast-isel.ll
  test/CodeGen/X86/avx-intrinsics-x86.ll
  test/CodeGen/X86/avx-splat.ll
  test/CodeGen/X86/avx-vbroadcast.ll
  test/CodeGen/X86/merge-consecutive-loads-128.ll
  test/CodeGen/X86/pshufb-mask-comments.ll
  test/CodeGen/X86/sad.ll
  test/CodeGen/X86/sse3-avx-addsub-2.ll
  test/CodeGen/X86/sse3.ll
  test/CodeGen/X86/vector-shuffle-128-v16.ll
  test/CodeGen/X86/vector-shuffle-128-v2.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v16.ll
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll
  test/CodeGen/X86/vector-shuffle-combining-avx.ll
  test/CodeGen/X86/vector-shuffle-combining-avx2.ll
  test/CodeGen/X86/vector-shuffle-combining-avx512bw.ll
  test/CodeGen/X86/vector-shuffle-combining.ll

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