[all-commits] [llvm/llvm-project] a861c9: [InstCombine] Allow values with multiple users in ...

[Piotr Sobczak via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a861c9aef926f963ea31581bebbd197356323928
      https://github.com/llvm/llvm-project/commit/a861c9aef926f963ea31581bebbd197356323928
  Author: Piotr Sobczak <piotr.sobczak at amd.com>
  Date:   2019-10-21 (Mon, 21 Oct 2019)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineInternal.h
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    M llvm/test/Transforms/InstCombine/AMDGPU/amdgcn-demanded-vector-elts.ll

  Log Message:
  -----------
  [InstCombine] Allow values with multiple users in SimplifyDemandedVectorElts

Summary:
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.

Reviewers: reames, arsenm, majnemer, nhaehnle

Reviewed By: nhaehnle

Subscribers: wdng, jvesely, nhaehnle, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67345

llvm-svn: 375395