[PATCH 2/2] config/arm: add support for fallback march
Ruifeng Wang
Ruifeng.Wang at arm.com
Mon Jan 22 07:30:39 CET 2024
+Cc
On 2024/1/21 5:36 PM, pbhagavatula at marvell.com wrote:
> From: Pavan Nikhilesh <pbhagavatula at marvell.com>
>
> Some ARM CPUs have specific march requirements and
> are not compatible with the supported march list.
> Add fallback march in case the mcpu and the march
> advertised in the part_number_config are not supported
> by the compiler.
>
> Example
> mcpu = neoverse-n2
> march = armv9-a
> fallback_march = armv8.5-a
>
> mcpu, march not supported
> machine_args = ['-march=armv8.5-a']
>
> mcpu, march, fallback_march not supported
> least march supported = armv8-a
>
> machine_args = ['-march=armv8-a']
>
> Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
> ---
> config/arm/meson.build | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/config/arm/meson.build b/config/arm/meson.build
> index 8c8cfccca0..2aaf78a81a 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -94,6 +94,7 @@ part_number_config_arm = {
> '0xd49': {
> 'march': 'armv9-a',
> 'march_features': ['sve2'],
> + 'fallback_march': 'armv8.5-a',
> 'mcpu': 'neoverse-n2',
> 'flags': [
> ['RTE_MACHINE', '"neoverse-n2"'],
> @@ -709,14 +710,14 @@ if update_flags
>
> # probe supported archs and their features
> candidate_march = ''
> + supported_marchs = ['armv9-a', 'armv8.6-a', 'armv8.5-a', 'armv8.4-a',
> + 'armv8.3-a', 'armv8.2-a', 'armv8.1-a', 'armv8-a']
> if part_number_config.has_key('march')
> if part_number_config.get('force_march', false) or support_mcpu
> if cc.has_argument('-march=' + part_number_config['march'])
> candidate_march = part_number_config['march']
> endif
> else
> - supported_marchs = ['armv8.6-a', 'armv8.5-a', 'armv8.4-a', 'armv8.3-a',
> - 'armv8.2-a', 'armv8.1-a', 'armv8-a']
> check_compiler_support = false
> foreach supported_march: supported_marchs
> if supported_march == part_number_config['march']
> @@ -733,6 +734,16 @@ if update_flags
> endif
>
> if candidate_march != part_number_config['march']
> + if part_number_config.has_key('fallback_march') and not support_mcpu
> + fallback_march = part_number_config['fallback_march']
> + foreach supported_march: supported_marchs
> + if (supported_march == fallback_march
> + and cc.has_argument('-march=' + supported_march))
> + candidate_march = supported_march
> + break
> + endif
> + endforeach
> + endif
> warning('Configuration march version is @0@, not supported.'
> .format(part_number_config['march']))
> if candidate_march != ''
> --
> 2.25.1
>
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