mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* Copyright (C) 1997 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 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. */
|
|
|
|
#define __LIBC_M81_MATH_INLINES
|
|
#include <math.h>
|
|
#include "math_private.h"
|
|
|
|
#ifndef SUFF
|
|
#define SUFF
|
|
#endif
|
|
#ifndef float_type
|
|
#define float_type double
|
|
#endif
|
|
|
|
#define __CONCATX(a,b) __CONCAT(a,b)
|
|
|
|
float_type
|
|
__CONCATX(__ieee754_atan2,SUFF) (float_type y, float_type x)
|
|
{
|
|
float_type pi, pi_2, z;
|
|
|
|
__asm ("fmovecr%.x %#0, %0" : "=f" (pi));
|
|
__asm ("fscale%.w %#-1, %0" : "=f" (pi_2) : "0" (pi));
|
|
if (x != x || y != y)
|
|
z = x + y;
|
|
else if (y == 0)
|
|
{
|
|
if (signbit (x))
|
|
z = signbit (y) ? -pi : pi;
|
|
else
|
|
z = y;
|
|
}
|
|
else if (__m81_u(__CONCATX(__isinf,SUFF)) (x))
|
|
{
|
|
if (__m81_u(__CONCATX(__isinf,SUFF)) (y))
|
|
{
|
|
float_type pi_4;
|
|
__asm ("fscale%.w %#-1, %0" : "=f" (pi_4) : "0" (pi_2));
|
|
z = x > 0 ? pi_4 : 3 * pi_4;
|
|
}
|
|
else
|
|
z = x > 0 ? 0 : pi;
|
|
if (signbit (y))
|
|
z = -z;
|
|
}
|
|
else if (__m81_u(__CONCATX(__isinf,SUFF)) (y))
|
|
z = y > 0 ? pi_2 : -pi_2;
|
|
else if (x > 0)
|
|
{
|
|
if (y > 0)
|
|
{
|
|
if (x > y)
|
|
z = __m81_u(__CONCATX(__atan,SUFF)) (y / x);
|
|
else
|
|
z = pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
|
|
}
|
|
else
|
|
{
|
|
if (x > -y)
|
|
z = __m81_u(__CONCATX(__atan,SUFF)) (y / x);
|
|
else
|
|
z = -pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (y < 0)
|
|
{
|
|
if (-x > y)
|
|
z = -pi + __m81_u(__CONCATX(__atan,SUFF)) (y / x);
|
|
else
|
|
z = -pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
|
|
}
|
|
else
|
|
{
|
|
if (-x > y)
|
|
z = pi + __m81_u(__CONCATX(__atan,SUFF)) (y / x);
|
|
else
|
|
z = pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
|
|
}
|
|
}
|
|
return z;
|
|
}
|