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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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| .. | ||
| tests | ||
| cordic.c | ||
| div64.c | ||
| gcd.c | ||
| int_log.c | ||
| int_pow.c | ||
| int_sqrt.c | ||
| Kconfig | ||
| lcm.c | ||
| Makefile | ||
| prime_numbers_private.h | ||
| prime_numbers.c | ||
| rational.c | ||
| reciprocal_div.c | ||
| test_div64.c | ||
| test_mul_u64_u64_div_u64.c | ||