[all-commits] [llvm/llvm-project] 3c36de: GlobalISel: Try to fold G_SEXT_INREG to G_AND with...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3c36de55f5e60dee8f1bc04bd201f6dd762b3423
      https://github.com/llvm/llvm-project/commit/3c36de55f5e60dee8f1bc04bd201f6dd762b3423
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2022-11-18 (Fri, 18 Nov 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    A llvm/test/CodeGen/AMDGPU/GlobalISel/prelegalizer-combiner-sext_inreg-to-and.mir

  Log Message:
  -----------
  GlobalISel: Try to fold G_SEXT_INREG to G_AND with mask

Copies the same transform from the DAG. Helps eliminate some codegen
diffs to allowed shared checks in a future change.

Not sure if apply supports anything better than C++ fragments for
the result. It's also not really reasonable that every combine has
to set the default insertion point.