1 /* k_cosf.c -- float version of k_cos.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/k_cosf.c,v 1.5 1999/08/28 00:06:40 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/k_cosf.c,v 1.2 2003/06/17 04:26:53 dillon Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
20 #include "math_private.h"
27 one = 1.0000000000e+00, /* 0x3f800000 */
28 C1 = 4.1666667908e-02, /* 0x3d2aaaab */
29 C2 = -1.3888889225e-03, /* 0xbab60b61 */
30 C3 = 2.4801587642e-05, /* 0x37d00d01 */
31 C4 = -2.7557314297e-07, /* 0xb493f27c */
32 C5 = 2.0875723372e-09, /* 0x310f74f6 */
33 C6 = -1.1359647598e-11; /* 0xad47d74e */
36 float __kernel_cosf(float x, float y)
38 float __kernel_cosf(x, y)
45 ix &= 0x7fffffff; /* ix = |x|'s high word*/
46 if(ix<0x32000000) { /* if x < 2**27 */
47 if(((int)x)==0) return one; /* generate inexact */
50 r = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6)))));
51 if(ix < 0x3e99999a) /* if |x| < 0.3 */
52 return one - ((float)0.5*z - (z*r - x*y));
54 if(ix > 0x3f480000) { /* x > 0.78125 */
57 SET_FLOAT_WORD(qx,ix-0x01000000); /* x/4 */
61 return a - (hz - (z*r-x*y));