[PATCH 2/2] config/arm: add armv9-a march

[Ruifeng Wang]

On 2024/1/4 5:18 PM, pbhagavatula at marvell.com wrote:
> From: Pavan Nikhilesh <pbhagavatula at marvell.com>
> 
> Now that major versions of GCC recognize armv9-a march option,
> add it to the list of supported march.
> Update neoverse-n2 part number to include march as armv9-a.
> 
> Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
> ---
>   config/arm/meson.build | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/config/arm/meson.build b/config/arm/meson.build
> index 36f21d2259..0804877b57 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -92,6 +92,7 @@ part_number_config_arm = {
>           'march': 'armv8.4-a',
>       },
>       '0xd49': {
> +        'march': 'armv9-a',
>           'march_features': ['sve2'],
>           'compiler_options': ['-mcpu=neoverse-n2'],
>           'flags': [
> @@ -701,7 +702,7 @@ if update_flags
>           if part_number_config.get('force_march', false)
>               candidate_march = part_number_config['march']
>           else
> -            supported_marchs = ['armv8.6-a', 'armv8.5-a', 'armv8.4-a', 'armv8.3-a',
> +            supported_marchs = ['armv9-a', 'armv8.6-a', 'armv8.5-a', 'armv8.4-a', 'armv8.3-a',

armv9.x-a have some overlap with armv8.x-a.
For armv9.0, the next candidate fallback should be armv8.4-a instead of 
armv8.6-a.
armv9 should be treated differently for fallback support.

>                                   'armv8.2-a', 'armv8.1-a', 'armv8-a']
>               check_compiler_support = false
>               foreach supported_march: supported_marchs