lib: test_mul_u64_u64_div_u64(): test both generic and arch versions

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Change the #if in div64.c so that test_mul_u64_u64_div_u64.c can compile
and test the generic version (including the 'long multiply') on
architectures (eg amd64) that define their own copy.

Test the kernel version and the locally compiled version on all arch. 
Output the time taken (in ns) on the 'test completed' trace.

For reference, on my zen 5, the optimised version takes ~220ns and the
generic version ~3350ns.  Using the native multiply saves ~200ns and
adding back the ilog2() 'optimisation' test adds ~50ms.

Link: https://lkml.kernel.org/r/20251105201035.64043-7-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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David Laight 2025-11-05 20:10:32 +00:00 • committed by Andrew Morton

parent 500db21917

commit f0bff2eb04

2 changed files with 51 additions and 9 deletions

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8

lib/math/div64.c

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52

lib/math/test_mul_u64_u64_div_u64.c

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