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/* Copyright (C) 1996 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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <math.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);
}
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