| k_cosf.c (152869) | k_cosf.c (152951) |
|---|---|
| 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. 4 */ 5 6/* 7 * ==================================================== 8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 9 * 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 13 * is preserved. 14 * ==================================================== 15 */ 16 17#ifndef INLINE_KERNEL_COSDF 18#ifndef lint | 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. 4 */ 5 6/* 7 * ==================================================== 8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 9 * 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 13 * is preserved. 14 * ==================================================== 15 */ 16 17#ifndef INLINE_KERNEL_COSDF 18#ifndef lint |
| 19static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_cosf.c 152869 2005-11-28 04:58:57Z bde $"; | 19static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_cosf.c 152951 2005-11-30 11:51:17Z bde $"; |
| 20#endif 21#endif 22 23#include "math.h" 24#include "math_private.h" 25 26/* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */ 27static const double --- 4 unchanged lines hidden (view full) --- 32C3 = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */ 33 34#ifdef INLINE_KERNEL_COSDF 35extern inline 36#endif 37float 38__kernel_cosdf(double x) 39{ | 20#endif 21#endif 22 23#include "math.h" 24#include "math_private.h" 25 26/* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */ 27static const double --- 4 unchanged lines hidden (view full) --- 32C3 = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */ 33 34#ifdef INLINE_KERNEL_COSDF 35extern inline 36#endif 37float 38__kernel_cosdf(double x) 39{ |
| 40 double z,r; | 40 double r, w, z; |
| 41 | 41 |
| 42 z = x*x; 43 r = z*(C1+z*(C2+z*C3)); 44 return (one+z*C0) + z*r; | 42 /* Try to optimize for parallel evaluation as in k_tanf.c. */ 43 z = x*x; 44 w = z*z; 45 r = C2+z*C3; 46 return ((one+z*C0) + w*C1) + (w*z)*r; |
| 45} | 47} |