[all-commits] [llvm/llvm-project] ee78e0: AMDGPU: Avoid instantiating PatFrag with null_frag...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ee78e038667d89f5dcd5ed25a36659b3653095d0
      https://github.com/llvm/llvm-project/commit/ee78e038667d89f5dcd5ed25a36659b3653095d0
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-01-09 (Tue, 09 Jan 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/VOP3PInstructions.td

  Log Message:
  -----------
  AMDGPU: Avoid instantiating PatFrag with null_frag (#77271)

This makes it possible to pass null_frag to the MAIInst multiclass.

null_frag does not work as you may hope if used as the input to a
PatFrag, which is what happens when it's passed through to *MAIFrag.
Avoid this by checking for null_frag. It might be possible to hack up
tablegen to allow consuming PatFrag inputs.