1 /* s_cosf.c -- float version of s_cos.c.
2 Copyright (C) 2011 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, see <http://www.gnu.org/licenses/>. */
22 #include "math_private.h"
24 static const float one
= 1.0;
25 static const float pio4
= 7.8539801e-1;
34 ix
= __builtin_fabsf (x
);
39 return __kernel_cosf (x
, z
);
40 /* cos(Inf or NaN) is NaN */
52 /* argument reduction needed */
55 n
= __ieee754_rem_pio2f (x
, y
);
59 return __kernel_cosf (y
[0], y
[1]);
61 return -__kernel_sinf (y
[0], y
[1], 1);
63 return -__kernel_cosf (y
[0], y
[1]);
65 return __kernel_sinf (y
[0], y
[1], 1);
70 weak_alias (__cosf
, cosf
)