[all-commits] [llvm/llvm-project] 319f4c: [Clang][AArch64] Emit 'unimplemented' diagnostic f...

[Sander de Smalen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 319f4c03ba2909c7240ac157cc46216bf1518c10
      https://github.com/llvm/llvm-project/commit/319f4c03ba2909c7240ac157cc46216bf1518c10
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2024-02-02 (Fri, 02 Feb 2024)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/Sema/SemaChecking.cpp
    M clang/test/Sema/aarch64-sme-func-attrs.c

  Log Message:
  -----------
  [Clang][AArch64] Emit 'unimplemented' diagnostic for SME (#80295)

When a function F has ZA and ZT0 state, calls another function G that 
only shares ZT0 state with its caller, F will have to save ZA before
the call to G, and restore it afterwards (rather than setting up a
lazy-sve).

This is not yet implemented in LLVM and does not result in a 
compile-time error either. So instead of silently generating incorrect
code, it's better to emit an error saying this is not yet implemented.