[all-commits] [llvm/llvm-project] c658b4: [GlobalISel] Add a constant folding combine.

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c658b472f3e61e1818e1909bf02f3d65470018a5
      https://github.com/llvm/llvm-project/commit/c658b472f3e61e1818e1909bf02f3d65470018a5
  Author: Amara Emerson <amara at apple.com>
  Date:   2021-07-26 (Mon, 26 Jul 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/lib/Target/AArch64/AArch64Combine.td
    M llvm/test/CodeGen/AArch64/GlobalISel/arm64-atomic-128.ll
    A llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-combiner-constant-fold.mir
    M llvm/test/CodeGen/AArch64/fold-global-offsets.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/fshl.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/fshr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/saddsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ssubsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i32.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i32.ll

  Log Message:
  -----------
  [GlobalISel] Add a constant folding combine.

Use it AArch64 post-legal combiner. These don't always get folded because when
the instructions are created the constants are obscured by artifacts.

Differential Revision: https://reviews.llvm.org/D106776