[all-commits] [llvm/llvm-project] 228dae: [X86] Use pseudo instructions to zero registers in...

[Abhishek Kaushik via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 228dae786b94bb85fb34bc157a43ca6c16932b6d
      https://github.com/llvm/llvm-project/commit/228dae786b94bb85fb34bc157a43ca6c16932b6d
  Author: Abhishek Kaushik <abhishek.kaushik at intel.com>
  Date:   2025-10-17 (Fri, 17 Oct 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86InstrInfo.cpp
    A llvm/test/CodeGen/X86/zero-call-used-regs-simd.ll

  Log Message:
  -----------
  [X86] Use pseudo instructions to zero registers in `buildClearRegister` (#163358)

In `buildClearRegister` use the correct pseudo-opcode for each register
class:

- For `VR128`, use `V_SET0`
- For `VR256`, use `AVX_SET0`
- For `VR512`, use `AVX512_512_SET0`
- For `VK*`, use `KSET0Q/KSET0W`

This avoids illegal register/opcode pairings and machine verifier errors
when clearing call-used registers under `-fzero-call-used-regs=used`.

Fixes: #163053

---------

Co-authored-by: Simon Pilgrim <llvm-dev at redking.me.uk>



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