diff mbox series

[v2,2/3] config/arm: add support for fallback march

Message ID 20240201215731.4543-2-pbhagavatula@marvell.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series [v2,1/3] config/arm: avoid mcpu and march conflicts |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Pavan Nikhilesh Bhagavatula Feb. 1, 2024, 9:57 p.m. UTC 
  From: Pavan Nikhilesh <pbhagavatula@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@marvell.com>
---
 config/arm/meson.build | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/config/arm/meson.build b/config/arm/meson.build
index ba859bd060..6f2308f2fa 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"'],
@@ -708,6 +709,7 @@  if update_flags
 
     # probe supported archs and their features
     candidate_march = ''
+    fallback_march = ''
     if part_number_config.has_key('march')
         if part_number_config.get('force_march', false) or candidate_mcpu != ''
             if cc.has_argument('-march=' +  part_number_config['march'])
@@ -728,10 +730,17 @@  if update_flags
                     # highest supported march version found
                     break
                 endif
+                if (supported_march == part_number_config['fallback_march']
+                    and cc.has_argument('-march=' + supported_march))
+                    fallback_march = supported_march
+                endif
             endforeach
         endif
 
         if candidate_march != part_number_config['march']
+            if fallback_march != ''
+                candidate_march = fallback_march
+            endif
             warning('Configuration march version is @0@, not supported.'
                     .format(part_number_config['march']))
             if candidate_march != ''