diff options
Diffstat (limited to 'lib/libc/string/flsl.c')
| -rw-r--r-- | lib/libc/string/flsl.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/lib/libc/string/flsl.c b/lib/libc/string/flsl.c index 60370cf7d832..d88c8dfcdc63 100644 --- a/lib/libc/string/flsl.c +++ b/lib/libc/string/flsl.c @@ -3,6 +3,11 @@ * * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. + * Copyright (c) 2023 The FreeBSD Foundation + + * + * Portions of this software were developed by Robert Clausecker + * <fuz@FreeBSD.org> under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -29,9 +34,7 @@ * SUCH DAMAGE. */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - +#include <limits.h> #include <strings.h> /* @@ -40,11 +43,5 @@ __FBSDID("$FreeBSD$"); int flsl(long mask) { - int bit; - - if (mask == 0) - return (0); - for (bit = 1; mask != 1; bit++) - mask = (unsigned long)mask >> 1; - return (bit); + return (mask == 0 ? 0 : CHAR_BIT * sizeof(mask) - __builtin_clzl(mask)); } |