[all-commits] [llvm/llvm-project] c83932: [GlobalISel] combine trunc(trunc) pattern

[Dominik Montada via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: c8393240abc10218b03f2cafe9a83b1fb29b4e3d
      https://github.com/llvm/llvm-project/commit/c8393240abc10218b03f2cafe9a83b1fb29b4e3d
  Author: Dominik Montada <dominik.montada at hightec-rt.com>
  Date:   2020-04-08 (Wed, 08 Apr 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-load-trunc.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-trunc.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-bitcast.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-extract.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-implicit-def-s1025.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-implicit-def.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-inttoptr.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-trunc.mir

  Log Message:
  -----------
  [GlobalISel] combine trunc(trunc) pattern

Summary:
Legalization can introduce the trunc(trunc) pattern. This can cause
problems if one of these intermediate truncs is not legal.
Combine truncs of this pattern, if the resulting trunc is legal.

Reviewers: arsenm, aemerson, dsanders

Reviewed By: arsenm

Subscribers: jvesely, wdng, nhaehnle, rovka, kerbowa, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76601