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Add the ffsll and flsll functions. These are ffs and fls operating
on long long arguments. Reviewed by: bde (previous version, that included asm implementation for all ffs and fls functions on i386 and amd64) MFC after: 2 weeks
This commit is contained in:
Konstantin Belousov
parent
6f41f432e1
commit
4a723bd20c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=184587
@ -44,8 +44,10 @@ void bzero(void *, size_t); /* LEGACY */
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int ffs(int) __pure2;
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#ifdef __BSD_VISIBLE
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int ffsl(long) __pure2;
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int ffsll(long long) __pure2;
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int fls(int) __pure2;
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int flsl(long) __pure2;
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int flsll(long long) __pure2;
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#endif
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char *index(const char *, int) __pure; /* LEGACY */
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char *rindex(const char *, int) __pure; /* LEGACY */
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@ -6,8 +6,8 @@
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CFLAGS+= -I${.CURDIR}/locale
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# machine-independent string sources
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MISRCS+=bcmp.c bcopy.c bzero.c ffs.c ffsl.c fls.c flsl.c index.c memccpy.c \
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memchr.c memrchr.c memcmp.c \
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MISRCS+=bcmp.c bcopy.c bzero.c ffs.c ffsl.c ffsll.c fls.c flsl.c flsll.c \
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index.c memccpy.c memchr.c memrchr.c memcmp.c \
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memcpy.c memmem.c memmove.c memset.c rindex.c stpcpy.c strcasecmp.c \
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strcat.c strchr.c strcmp.c strcoll.c strcpy.c strcspn.c strdup.c \
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strerror.c strlcat.c strlcpy.c strlen.c strmode.c strncat.c strncmp.c \
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@ -38,6 +38,8 @@ MAN+= bcmp.3 bcopy.3 bstring.3 bzero.3 ffs.3 index.3 memccpy.3 memchr.3 \
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MLINKS+=ffs.3 ffsl.3
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MLINKS+=ffs.3 fls.3
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MLINKS+=ffs.3 flsl.3
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MLINKS+=ffs.3 ffsll.3
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MLINKS+=ffs.3 flsll.3
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MLINKS+=index.3 rindex.3
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MLINKS+=memchr.3 memrchr.3
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MLINKS+=strcasecmp.3 strncasecmp.3
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@ -78,6 +78,8 @@ FBSD_1.0 {
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};
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FBSD_1.1 {
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ffsll;
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flsll;
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memrchr;
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};
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@ -30,14 +30,16 @@
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.\" @(#)ffs.3 8.2 (Berkeley) 4/19/94
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.\" $FreeBSD$
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.\"
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.Dd October 12, 2006
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.Dd October 26, 2008
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.Dt FFS 3
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.Os
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.Sh NAME
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.Nm ffs ,
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.Nm ffsl ,
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.Nm ffsll ,
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.Nm fls ,
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.Nm flsl
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.Nm flsl ,
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.Nm flsll
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.Nd find first or last bit set in a bit string
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.Sh LIBRARY
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.Lb libc
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@ -48,14 +50,19 @@
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.Ft int
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.Fn ffsl "long value"
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.Ft int
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.Ft int
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.Fn ffsll "long long value"
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.Fn fls "int value"
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.Ft int
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.Fn flsl "long value"
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.Ft int
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.Fn flsll "long long value"
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.Sh DESCRIPTION
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The
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.Fn ffs
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and
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.Fn ffs ,
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.Fn ffsl
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and
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.Fn ffsll
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functions find the first bit set
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(beginning with the least significant bit)
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in
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@ -63,9 +70,10 @@ in
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and return the index of that bit.
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.Pp
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The
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.Fn fls
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and
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.Fn fls ,
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.Fn flsl
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and
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.Fn flsll
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functions find the last bit set in
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.Fa value
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and return the index of that bit.
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@ -95,3 +103,9 @@ and
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.Fn flsl
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functions appeared in
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.Fx 5.3 .
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The
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.Fn ffsll
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and
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.Fn flsll
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functions appeared in
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.Fx 8.0 .
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48
lib/libc/string/ffsll.c
Normal file
48
lib/libc/string/ffsll.c
Normal file
@ -0,0 +1,48 @@
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <strings.h>
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/*
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* Find First Set bit
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*/
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int
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ffsll(long long mask)
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{
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int bit;
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if (mask == 0)
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return (0);
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for (bit = 1; !(mask & 1); bit++)
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mask = (unsigned long long)mask >> 1;
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return (bit);
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}
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48
lib/libc/string/flsll.c
Normal file
48
lib/libc/string/flsll.c
Normal file
@ -0,0 +1,48 @@
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <strings.h>
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/*
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* Find Last Set bit
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*/
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int
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flsll(long long mask)
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{
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int bit;
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if (mask == 0)
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return (0);
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for (bit = 1; mask != 1; bit++)
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mask = (unsigned long long)mask >> 1;
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return (bit);
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}
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