[all-commits] [llvm/llvm-project] b6e9ba: [FMV][AArch64] Unify features memtag and memtag2. ...

[Alexandros Lamprineas via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b6e9ba017f222b2f95237d69126281d6252bf176
      https://github.com/llvm/llvm-project/commit/b6e9ba017f222b2f95237d69126281d6252bf176
  Author: Alexandros Lamprineas <alexandros.lamprineas at arm.com>
  Date:   2024-10-21 (Mon, 21 Oct 2024)

  Changed paths:
    M clang/include/clang/Basic/AttrDocs.td
    M clang/lib/Basic/Targets/AArch64.cpp
    M clang/test/CodeGen/aarch64-cpu-supports-target.c
    M clang/test/CodeGen/aarch64-cpu-supports.c
    M clang/test/CodeGen/aarch64-fmv-dependencies.c
    M clang/test/CodeGen/attr-target-clones-aarch64.c
    M clang/test/CodeGen/attr-target-version.c
    M clang/test/Sema/attr-target-clones-aarch64.c
    M compiler-rt/lib/builtins/cpu_model/AArch64CPUFeatures.inc
    M compiler-rt/lib/builtins/cpu_model/aarch64/fmv/mrs.inc
    M llvm/include/llvm/TargetParser/AArch64CPUFeatures.inc
    M llvm/lib/Target/AArch64/AArch64FMV.td

  Log Message:
  -----------
  [FMV][AArch64] Unify features memtag and memtag2. (#112511)

If we split these features in the compiler (see relevant pull request
https://github.com/llvm/llvm-project/pull/109299), we would only be able
to hand-write a 'memtag2' version using inline assembly since the
compiler cannot generate the instructions that become available with
FEAT_MTE2. However these instructions only work at Exception Level 1, so
they would be unusable since FMV is a user space facility. I am
therefore unifying them.

Approved in ACLE as https://github.com/ARM-software/acle/pull/351



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