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amd64: patch ffsl to use the compiler builtin

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This shortens fdalloc by over 60 bytes. Correctness verified by running both
variants at the same time and comparing the result of each call.

Note someone(tm) should make a pass at converting everything else feasible.
This commit is contained in:
Mateusz Guzik 2020-07-16 11:28:24 +00:00
parent 6b8b1bfef0
commit c4e64133d8
1 changed files with 2 additions and 1 deletions
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3
sys/amd64/include/cpufunc.h
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@ -167,7 +167,8 @@ enable_intr(void)
static __inline __pure2 int
ffsl(long mask)
{
return (mask == 0 ? mask : (int)bsfq((u_long)mask) + 1);
return (__builtin_ffsl(mask));
}
#define HAVE_INLINE_FFSLL