mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 18:40:14 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/* Copyright (C) 1997, 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; 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"
|
|
#include "mathimpl.h"
|
|
|
|
#ifndef SUFF
|
|
#define SUFF
|
|
#endif
|
|
#ifndef float_type
|
|
#define float_type double
|
|
#endif
|
|
|
|
#define CONCATX(a,b) __CONCAT(a,b)
|
|
#define s(name) CONCATX(name,SUFF)
|
|
#define m81(func) __m81_u(s(func))
|
|
|
|
float_type
|
|
s(__ieee754_atan2) (float_type y, float_type x)
|
|
{
|
|
float_type pi, pi_2, z;
|
|
unsigned long y_cond, x_cond;
|
|
|
|
__asm ("fmovecr%.x %#0, %0" : "=f" (pi));
|
|
__asm ("fscale%.w %#-1, %0" : "=f" (pi_2) : "0" (pi));
|
|
y_cond = __m81_test (y);
|
|
x_cond = __m81_test (x);
|
|
|
|
if ((x_cond | y_cond) & __M81_COND_NAN)
|
|
z = x + y;
|
|
else if (y_cond & __M81_COND_ZERO)
|
|
{
|
|
if (x_cond & __M81_COND_NEG)
|
|
z = y_cond & __M81_COND_NEG ? -pi : pi;
|
|
else
|
|
z = y;
|
|
}
|
|
else if (x_cond & __M81_COND_INF)
|
|
{
|
|
if (y_cond & __M81_COND_INF)
|
|
{
|
|
float_type pi_4;
|
|
__asm ("fscale%.w %#-2, %0" : "=f" (pi_4) : "0" (pi));
|
|
z = x_cond & __M81_COND_NEG ? 3 * pi_4 : pi_4;
|
|
}
|
|
else
|
|
z = x_cond & __M81_COND_NEG ? pi : 0;
|
|
if (y_cond & __M81_COND_NEG)
|
|
z = -z;
|
|
}
|
|
else if (y_cond & __M81_COND_INF)
|
|
z = y_cond & __M81_COND_NEG ? -pi_2 : pi_2;
|
|
else if (x_cond & __M81_COND_NEG)
|
|
{
|
|
if (y_cond & __M81_COND_NEG)
|
|
{
|
|
if (-x > -y)
|
|
z = -pi + m81(__atan) (y / x);
|
|
else
|
|
z = -pi_2 - m81(__atan) (x / y);
|
|
}
|
|
else
|
|
{
|
|
if (-x > y)
|
|
z = pi + m81(__atan) (y / x);
|
|
else
|
|
z = pi_2 - m81(__atan) (x / y);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (y_cond & __M81_COND_NEG)
|
|
{
|
|
if (x > -y)
|
|
z = m81(__atan) (y / x);
|
|
else
|
|
z = -pi_2 - m81(__atan) (x / y);
|
|
}
|
|
else
|
|
{
|
|
if (x > y)
|
|
z = m81(__atan) (y / x);
|
|
else
|
|
z = pi_2 - m81(__atan) (x / y);
|
|
}
|
|
}
|
|
return z;
|
|
}
|