[PATCH] D56387: [DAGCombiner] Enable SimplifyDemandedBits vector support for TRUNCATE (WIP)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, efriedma, arsenm, t.p.northover.
Herald added subscribers: javed.absar, nhaehnle, wdng, jvesely.

As discussed on D56118 <https://reviews.llvm.org/D56118>, currently there are a number of regressions when we enable root support for SimplifyDemandedBits to handle TRUNCATE vectors (note - it already accepts truncation of vectors further down the simplification call tree).

This patch is currently a placeholder to show the regressions and to help us work out what needs to be fixed.


Repository:
  rL LLVM

https://reviews.llvm.org/D56387

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AMDGPU/idot4.ll
  test/CodeGen/AMDGPU/idot8.ll
  test/CodeGen/AMDGPU/widen-smrd-loads.ll
  test/CodeGen/ARM/lowerMUL-newload.ll
  test/CodeGen/X86/avx512-any_extend_load.ll
  test/CodeGen/X86/combine-sra.ll
  test/CodeGen/X86/known-signbits-vector.ll
  test/CodeGen/X86/vector-blend.ll
  test/CodeGen/X86/vector-trunc-widen.ll
  test/CodeGen/X86/vector-trunc.ll

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