[all-commits] [llvm/llvm-project] 445415: AMDGPU: Replace copy-to-mov-imm folding logic with...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 445415219708f9539801018e03282049ca33e0e2
      https://github.com/llvm/llvm-project/commit/445415219708f9539801018e03282049ca33e0e2
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-08-26 (Tue, 26 Aug 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    M llvm/test/CodeGen/AMDGPU/br_cc.f16.ll
    M llvm/test/CodeGen/AMDGPU/call-argument-types.ll
    M llvm/test/CodeGen/AMDGPU/gfx-callable-argument-types.ll
    M llvm/test/CodeGen/AMDGPU/gfx-callable-return-types.ll
    M llvm/test/CodeGen/AMDGPU/imm16.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.interp.inreg.ll

  Log Message:
  -----------
  AMDGPU: Replace copy-to-mov-imm folding logic with class compat checks (#154501)

This strengthens the check to ensure the new mov's source class
is compatible with the source register. This avoids using the register
sized based checks in getMovOpcode, which don't quite understand
AV superclasses correctly. As a side effect it also enables more folds
into true16 movs.

getMovOpcode should probably be deleted, or at least replaced
with class check based logic. In this particular case other
legality checks need to be mixed in with attempted IR changes,
so I didn't try to push all of that into the opcode selection.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications