[PATCH] D49262: [DAGCombiner] Call SimplifyDemandedVectorElts from EXTRACT_VECTOR_ELT

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon updated this revision to Diff 155685.
RKSimon edited the summary of this revision.
RKSimon added a reviewer: atanasyan.
RKSimon added a subscriber: atanasyan.
RKSimon added a comment.
Herald added subscribers: jrtc27, sdardis.

Updated with SystemZ fix to permit permute decode of target shuffles (well, SPLAT) as well - @uweigand does that look OK to you?

I've generalized DAGCombiner::visitEXTRACT_VECTOR_ELT to handle the case where the source vector has multiple uses, if all of them are EXTRACT_VECTOR_ELT we now accumulate the demanded mask accordingly - this simplifies some MIPS vector codegen so adding @atanasyan to take a look.


Repository:
  rL LLVM

https://reviews.llvm.org/D49262

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/SystemZ/SystemZISelLowering.cpp
  test/CodeGen/AMDGPU/indirect-addressing-si.ll
  test/CodeGen/ARM/func-argpassing-endian.ll
  test/CodeGen/Mips/cconv/vector.ll
  test/CodeGen/X86/dagcombine-cse.ll
  test/CodeGen/X86/extractelement-load.ll
  test/CodeGen/X86/known-bits-vector.ll
  test/CodeGen/X86/oddshuffles.ll
  test/CodeGen/X86/scalar_widen_div.ll
  test/CodeGen/X86/vec_shift7.ll

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