[PATCH] D54761: [SelectionDAG] Improve SimplifyDemandedBits to SimplifyDemandedVectorElts simplification

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: arsenm, rampitec, craig.topper, spatel, andreadb.
Herald added subscribers: nhaehnle, wdng, jvesely.

https://reviews.llvm.org/D52935 introduced the ability for SimplifyDemandedBits to call SimplifyDemandedVectorElts through BITCASTs if the demanded bit mask entirely covered the sub element.

This patch relaxes this to demanding an element if we need any bit from it.


Repository:
  rL LLVM

https://reviews.llvm.org/D54761

Files:
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  test/CodeGen/AMDGPU/idot8.ll
  test/CodeGen/AMDGPU/store-weird-sizes.ll
  test/CodeGen/X86/combine-sdiv.ll
  test/CodeGen/X86/pr35918.ll
  test/CodeGen/X86/rotate-extract-vector.ll
  test/CodeGen/X86/vector-rotate-128.ll
  test/CodeGen/X86/vector-shift-shl-128.ll

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