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Implement C99's signbit() macro.
This commit is contained in:
parent
ee7785a7f8
commit
8e9b28311e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=110734
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@ -24,7 +24,7 @@ SRCS+= __xuname.c _pthread_stubs.c _rand48.c _spinlock_stub.c _thread_init.c \
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scandir.c seed48.c seekdir.c semctl.c \
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scandir.c seed48.c seekdir.c semctl.c \
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setdomainname.c sethostname.c setjmperr.c setmode.c \
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setdomainname.c sethostname.c setjmperr.c setmode.c \
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setproctitle.c setprogname.c \
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setproctitle.c setprogname.c \
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siginterrupt.c siglist.c signal.c \
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siginterrupt.c siglist.c signal.c signbit.c \
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sigsetops.c sleep.c srand48.c statvfs.c stringlist.c strtofflags.c \
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sigsetops.c sleep.c srand48.c statvfs.c stringlist.c strtofflags.c \
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sysconf.c sysctl.c sysctlbyname.c sysctlnametomib.c \
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sysconf.c sysctl.c sysctlbyname.c sysctlnametomib.c \
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syslog.c telldir.c termios.c time.c times.c timezone.c ttyname.c \
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syslog.c telldir.c termios.c time.c times.c timezone.c ttyname.c \
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@ -53,7 +53,8 @@ MAN+= alarm.3 arc4random.3 \
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nice.3 nlist.3 pause.3 popen.3 pselect.3 psignal.3 pwcache.3 \
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nice.3 nlist.3 pause.3 popen.3 pselect.3 psignal.3 pwcache.3 \
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raise.3 rand48.3 readpassphrase.3 rfork_thread.3 \
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raise.3 rand48.3 readpassphrase.3 rfork_thread.3 \
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scandir.3 setjmp.3 setmode.3 setproctitle.3 shm_open.3 \
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scandir.3 setjmp.3 setmode.3 setproctitle.3 shm_open.3 \
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siginterrupt.3 signal.3 sigsetops.3 sleep.3 statvfs.3 stringlist.3 \
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siginterrupt.3 signal.3 signbit.3 sigsetops.3 sleep.3 \
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statvfs.3 stringlist.3 \
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strtofflags.3 sysconf.3 sysctl.3 syslog.3 tcgetpgrp.3 \
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strtofflags.3 sysconf.3 sysctl.3 syslog.3 tcgetpgrp.3 \
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tcsendbreak.3 tcsetattr.3 tcsetpgrp.3 time.3 times.3 timezone.3 \
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tcsendbreak.3 tcsetattr.3 tcsetpgrp.3 time.3 times.3 timezone.3 \
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ttyname.3 tzset.3 ualarm.3 ucontext.3 ulimit.3 uname.3 \
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ttyname.3 tzset.3 ualarm.3 ucontext.3 ulimit.3 uname.3 \
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57
lib/libc/gen/signbit.3
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57
lib/libc/gen/signbit.3
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@ -0,0 +1,57 @@
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.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd February 11, 2003
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.Dt FPCLASSIFY 3
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.Os
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.Sh NAME
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.Nm signbit
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.Nd "determine whether a floating-point number's sign is negative"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In math.h
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.Ft int
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.Fn signbit "real-floating x"
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.Sh DESCRIPTION
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The
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.Fn signbit
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macro takes an argument of
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.Va x
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and returns non-zero if the value of its sign is negative, otherwise 0.
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.Sh SEE ALSO
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.Xr fpclassify 3 ,
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.Xr math 3
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.Sh STANDARDS
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The
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.Fn signbit
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macro conforms to
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.St -isoC-99 .
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.Sh HISTORY
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The
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.Fn signbit
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macro was added in
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.Fx 5.1 .
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40
lib/libc/gen/signbit.c
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40
lib/libc/gen/signbit.c
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@ -0,0 +1,40 @@
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/*-
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* Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <math.h>
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#include "fpmath.h"
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int
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__signbit(double d)
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{
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union IEEEd2bits u;
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u.d = d;
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return (u.bits.sign);
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}
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@ -50,6 +50,7 @@ extern const union __nan_un {
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((sizeof (x) == sizeof (float)) ? __fpclassifyf(x) \
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((sizeof (x) == sizeof (float)) ? __fpclassifyf(x) \
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: (sizeof (x) == sizeof (double)) ? __fpclassifyd(x) \
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: (sizeof (x) == sizeof (double)) ? __fpclassifyd(x) \
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: __fpclassifyl(x))
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: __fpclassifyl(x))
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#define signbit(x) __signbit(x)
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typedef __double_t double_t;
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typedef __double_t double_t;
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typedef __float_t float_t;
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typedef __float_t float_t;
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@ -147,6 +148,7 @@ __BEGIN_DECLS
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int __fpclassifyd(double);
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int __fpclassifyd(double);
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int __fpclassifyf(float);
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int __fpclassifyf(float);
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int __fpclassifyl(long double);
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int __fpclassifyl(long double);
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int __signbit(double);
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double acos(double);
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double acos(double);
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double asin(double);
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double asin(double);
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