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46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#define __LIBC_M81_MATH_INLINES
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#include <math.h>
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#include "math_private.h"
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#ifndef FUNC
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#define FUNC tan
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#endif
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#ifndef float_type
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#define float_type double
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#endif
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#define __CONCATX(a,b) __CONCAT(a,b)
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float_type
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__CONCATX(__kernel_,FUNC) (x, y, iy)
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float_type x;
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float_type y;
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int iy;
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{
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float_type tan_x, tan_y;
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tan_x = __m81_u(__CONCATX(__,FUNC)) (x);
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tan_y = __m81_u(__CONCATX(__,FUNC)) (y);
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if (iy > 0)
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return (tan_x + tan_y) / (1 - tan_x * tan_y);
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else
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return (tan_x * tan_y - 1) / (tan_x + tan_y);
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}
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