46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Copyright (C) 1996, 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 FUNC
|
|
#define FUNC tan
|
|
#endif
|
|
#ifndef float_type
|
|
#define float_type double
|
|
#endif
|
|
|
|
#define __CONCATX(a,b) __CONCAT(a,b)
|
|
|
|
float_type
|
|
__CONCATX(__kernel_,FUNC) (x, y, iy)
|
|
float_type x;
|
|
float_type y;
|
|
int iy;
|
|
{
|
|
float_type tan_x, tan_y;
|
|
tan_x = __m81_u(__CONCATX(__,FUNC)) (x);
|
|
tan_y = __m81_u(__CONCATX(__,FUNC)) (y);
|
|
if (iy > 0)
|
|
return (tan_x + tan_y) / (1 - tan_x * tan_y);
|
|
else
|
|
return (tan_x * tan_y - 1) / (tan_x + tan_y);
|
|
}
|