[all-commits] [llvm/llvm-project] f444cc: [AArch64][SME] Preserve ZA in agnostic ZA function...

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/release/22.x
  Home:   https://github.com/llvm/llvm-project
  Commit: f444cca96bd5c8cba9e768ee15ebde8d72f37c2a
      https://github.com/llvm/llvm-project/commit/f444cca96bd5c8cba9e768ee15ebde8d72f37c2a
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2026-04-17 (Fri, 17 Apr 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/MachineSMEABIPass.cpp
    A llvm/test/CodeGen/AArch64/sme-agnostic-za-without-sme.ll

  Log Message:
  -----------
  [AArch64][SME] Preserve ZA in agnostic ZA functions without +sme (#190141)

`__arm_agnostic("sme_za_state")` does not require +sme, but we must
still preserve ZA in case the function is used with code that makes use
of ZA:

> The use of `__arm_agnostic("sme_za_state")` allows writing functions
> that are compatible with ZA state without having to share ZA state
> with the caller, as required by `__arm_preserves`. The use of this
> attribute does not imply that SME is available.



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