[PATCH] D11934: [InstCombine] Move SSE/AVX vector blend folding to instcombiner

[Simon Pilgrim via llvm-commits]

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

As discussed in D11886, this patch moves the SSE/AVX vector blend folding to instcombiner from PerformINTRINSIC_WO_CHAINCombine (which allowed us to remove this completely).

InstCombiner already had partial support for this, I just had to add support for zero (ConstantAggregateZero) masks and also the case where both selection inputs were the same (allowing us to ignore the mask).

I also moved all the relevant combine tests into InstCombine/blend_x86.ll

Repository:
  rL LLVM

http://reviews.llvm.org/D11934

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/CodeGen/X86/combine-avx-intrinsics.ll
  test/CodeGen/X86/combine-avx2-intrinsics.ll
  test/CodeGen/X86/combine-sse41-intrinsics.ll
  test/Transforms/InstCombine/blend_x86.ll

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