[all-commits] [llvm/llvm-project] 06da00: [ARM][Clang] Make `+nosimd` functional for AArch32...

[Jack Styles via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 06da00ae2d116bb2c4063b124429c2d29eb69d87
      https://github.com/llvm/llvm-project/commit/06da00ae2d116bb2c4063b124429c2d29eb69d87
  Author: Jack Styles <jack.styles at arm.com>
  Date:   2025-04-15 (Tue, 15 Apr 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/test/CodeGen/arm-target-features.c
    M clang/test/Driver/print-supported-extensions-arm.c
    M clang/test/Preprocessor/arm-target-features.c
    M llvm/include/llvm/TargetParser/ARMTargetParser.def
    M llvm/include/llvm/TargetParser/ARMTargetParser.h
    M llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
    M llvm/lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp
    M llvm/lib/TargetParser/ARMTargetParser.cpp
    M llvm/unittests/TargetParser/TargetParserTest.cpp

  Log Message:
  -----------
  [ARM][Clang] Make `+nosimd` functional for AArch32 Targets (#130623)

`+simd` and `+nosimd` are used to enable or disable NEON Instructions
when compiling for ARM Targets. However, up until now, using these
has not been possible. To enable this, these options are mapped to the
relevant LLVM backend option (`+neon` and `-neon`) so it can be both
enabled and disabled successfully by the user.

Tests have been added to ensure this behaviour is maintained in the
future, along with updates to existing tests as behaviour has now changed
relating to the use of `+simd` and `+nosimd`.

As `simd` has been mapped within the ARMTargetParser.def, support for
this extension is also added for the `--print-support-extensions` command
when the target is AArch32. This will print the `simd` option, along with the
description that relates to the Neon feature. This previously was not
possible as `simd` did not have a related Feature or Negative Feature.

To make this functional as intended, MVE and MVE.FP now rely on their
own Enum identifier, rather than `AEK_SIMD`. While SIMD does refer to
both Neon and Helium technologies, in terms of command line options,
SIMD relates to Neon. Helium relates to MVE and MVE.FP. The Enum
now reflects this too.



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