mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 18:40:14 +00:00
6796bc807a
1998-09-06 09:53 -0400 Zack Weinberg <zack@rabi.phys.columbia.edu> * Makeconfig (+gccwarn): Remove -Wno-parentheses. * elf/dl-open.c: Quiet -Wparentheses warnings. * iconvdata/johab.c: Likewise. * iconvdata/uhc.c: Likewise. * inet/inet_net.c: Likewise. * io/fts.c: Likewise. * locale/newlocale.c: Likewise. * misc/getttyent.c: Likewise. * misc/mntent_r.c: Likewise. * misc/ttyslot.c: Likewise. * nscd/nscd_conf.c: Likewise. * nss/nsswitch.c: Likewise. * resolv/gethnamaddr.c: Likewise. * resolv/nsap_addr.c: Likewise. * resolv/res_debug.c: Likewise. * stdio-common/_itoa.c: Likewise. * stdlib/strtod.c: Likewise. * string/strverscmp.c: Likewise. * sunrpc/svc.c: Likewise. * sysdeps/libm-ieee754/e_cosh.c: Likewise. * sysdeps/libm-ieee754/e_gamma_r.c: Likewise. * sysdeps/libm-ieee754/e_sinh.c: Likewise. * sysdeps/posix/getaddrinfo.c: Likewise. * include/dlfcn.h: Likewise. * elf/dlfcn.h: Declare dladdr only for __USE_GNU. Define RTLD_DEFAULT.
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/* Implementation of gamma function according to ISO C.
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
|
|
|
|
double
|
|
__ieee754_gamma_r (double x, int *signgamp)
|
|
{
|
|
/* We don't have a real gamma implementation now. We'll use lgamma
|
|
and the exp function. But due to the required boundary
|
|
conditions we must check some values separately. */
|
|
int32_t hx;
|
|
u_int32_t lx;
|
|
|
|
EXTRACT_WORDS (hx, lx, x);
|
|
|
|
if (((hx & 0x7fffffff) | lx) == 0)
|
|
/* Return value for x == 0 is NaN with invalid exception. */
|
|
return x / x;
|
|
if (hx < 0 && (u_int32_t) hx < 0xfff00000 && __rint (x) == x)
|
|
{
|
|
/* Return value for integer x < 0 is NaN with invalid exception. */
|
|
return (x - x) / (x - x);
|
|
}
|
|
|
|
/* XXX FIXME. */
|
|
return __ieee754_exp (__ieee754_lgamma_r (x, signgamp));
|
|
}
|