1 /* k_cosf.c -- float version of k_cos.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 * Debugged and optimized by Bruce D. Evans.
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
14 * ====================================================
16 * $FreeBSD: head/lib/msun/src/k_cosf.c 239192 2012-08-11 11:13:48Z dim $
20 #include "math_private.h"
22 /* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */
25 C0 = -0x1ffffffd0c5e81.0p-54, /* -0.499999997251031003120 */
26 C1 = 0x155553e1053a42.0p-57, /* 0.0416666233237390631894 */
27 C2 = -0x16c087e80f1e27.0p-62, /* -0.00138867637746099294692 */
28 C3 = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */
30 #ifdef INLINE_KERNEL_COSDF
34 __kernel_cosdf(double x)
38 /* Try to optimize for parallel evaluation as in k_tanf.c. */
42 return ((one+z*C0) + w*C1) + (w*z)*r;