[all-commits] [llvm/llvm-project] cc8dd6: [X86] Use kmovw, not kmovq, for VK16 copies withou...

[Justin Lebar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc8dd6ccd30774d3e084be01653c7c075d30c254
      https://github.com/llvm/llvm-project/commit/cc8dd6ccd30774d3e084be01653c7c075d30c254
  Author: Justin Lebar <justin.lebar at gmail.com>
  Date:   2026-05-29 (Fri, 29 May 2026)

  Changed paths:
    M llvm/lib/Target/X86/X86InstrInfo.cpp
    M llvm/test/CodeGen/X86/apx/kmov-kk.ll

  Log Message:
  -----------
  [X86] Use kmovw, not kmovq, for VK16 copies without BWI (#200337)

`copyPhysReg` selected `KMOVQkk_EVEX` for a `$k -> $k` VK16 copy on a
`+egpr` (APX) subtarget even without BWI, but `KMOVQ` requires BWI. Use
`KMOVW` instead.

This bug was found by a large run of Opus 4.7 looking for bugs in LLVM.



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