[all-commits] [llvm/llvm-project] 502368: [AArch64][SME] Emit unimplemented error for non-la...

[Sander de Smalen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5023684dff225519cbb714370a94a675487d5a28
      https://github.com/llvm/llvm-project/commit/5023684dff225519cbb714370a94a675487d5a28
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2026-09-30 (Wed, 30 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64SMEAttributes.h
    A llvm/test/CodeGen/AArch64/sme-non-lazy-save-za.ll

  Log Message:
  -----------
  [AArch64][SME] Emit unimplemented error for non-lazy-save of ZA. (#227608)

A non-lazy-save of ZA is required when the caller has both ZA and ZT0
state and calls a function with a shared-ZA interface that only shares
ZT0.

This case is already rejected by Clang but LLVM compiles it without
generating a save of ZA.



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