Author: mjg
Date: Thu Jul 16 11:28:24 2020
New Revision: 363242
URL: https://svnweb.freebsd.org/changeset/base/363242
Log:
amd64: patch ffsl to use the compiler builtin
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.
Modified:
head/sys/amd64/include/cpufunc.h
Modified: head/sys/amd64/include/cpufunc.h
==============================================================================
--- head/sys/amd64/include/cpufunc.h Thu Jul 16 10:20:35 2020
(r363241)
+++ head/sys/amd64/include/cpufunc.h Thu Jul 16 11:28:24 2020
(r363242)
@@ -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
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