[PATCH] D67345: [InstCombine] Allow values with multiple users in SimplifyDemandedVectorElts

[Piotr Sobczak via Phabricator via llvm-commits]

piotr created this revision.
Herald added subscribers: llvm-commits, nhaehnle, jvesely.
Herald added a project: LLVM.

Allow for ignoring the check for a single use in SimplifyDemandedVectorElts
to be able to simplify operands if DemandedElts is known to contain
the union of elements used by all users.
It is a responsibility of a caller of SimplifyDemandedVectorElts to
supply correct DemandedElts.

Simplify a series of extractelement instructions if only a subset of
elements is used.


Repository:
  rL LLVM

https://reviews.llvm.org/D67345

Files:
  lib/Transforms/InstCombine/InstCombineInternal.h
  lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  test/Transforms/InstCombine/AMDGPU/amdgcn-demanded-vector-elts.ll

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