| k_tanf.c (152741) | k_tanf.c (152766) |
|---|---|
| 1/* k_tanf.c -- float version of k_tan.c 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5/* 6 * ==================================================== 7 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. 8 * 9 * Permission to use, copy, modify, and distribute this 10 * software is freely granted, provided that this notice 11 * is preserved. 12 * ==================================================== 13 */ 14 15#ifndef INLINE_KERNEL_TANF 16#ifndef lint | 1/* k_tanf.c -- float version of k_tan.c 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5/* 6 * ==================================================== 7 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. 8 * 9 * Permission to use, copy, modify, and distribute this 10 * software is freely granted, provided that this notice 11 * is preserved. 12 * ==================================================== 13 */ 14 15#ifndef INLINE_KERNEL_TANF 16#ifndef lint |
| 17static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_tanf.c 152741 2005-11-24 02:04:26Z bde $"; | 17static char rcsid[] = "$FreeBSD: head/lib/msun/src/k_tanf.c 152766 2005-11-24 13:48:40Z bde $"; |
| 18#endif 19#endif 20 21#include "math.h" 22#include "math_private.h" 23 24/* |tan(x)/x - t(x)| < 2**-25.5 (~[-2e-08, 2e-08]). */ 25static const double --- 7 unchanged lines hidden (view full) --- 33}; 34 35#ifdef INLINE_KERNEL_TANF 36extern inline 37#endif 38float 39__kernel_tandf(double x, int iy) 40{ | 18#endif 19#endif 20 21#include "math.h" 22#include "math_private.h" 23 24/* |tan(x)/x - t(x)| < 2**-25.5 (~[-2e-08, 2e-08]). */ 25static const double --- 7 unchanged lines hidden (view full) --- 33}; 34 35#ifdef INLINE_KERNEL_TANF 36extern inline 37#endif 38float 39__kernel_tandf(double x, int iy) 40{ |
| 41 double z,r,v,w,s; 42 int32_t ix,hx; | 41 double z,r,w,s; |
| 43 | 42 |
| 44 GET_FLOAT_WORD(hx,x); 45 ix = hx&0x7fffffff; | |
| 46 z = x*x; 47 w = z*z; 48 /* Break x^5*(T[1]+x^2*T[2]+...) into 49 * x^5*(T[1]+x^4*T[3]+x^8*T[5]) + 50 * x^5*(x^2*(T[2]+x^4*T[4])) 51 */ | 43 z = x*x; 44 w = z*z; 45 /* Break x^5*(T[1]+x^2*T[2]+...) into 46 * x^5*(T[1]+x^4*T[3]+x^8*T[5]) + 47 * x^5*(x^2*(T[2]+x^4*T[4])) 48 */ |
| 52 r = T[1]+w*(T[3]+w*T[5]); 53 v = z*(T[2]+w*T[4]); | 49 r = T[1]+w*(T[3]+w*T[5]) + z*(T[2]+w*T[4]); |
| 54 s = z*x; | 50 s = z*x; |
| 55 r = z*s*(r+v); 56 r += T[0]*s; 57 w = x+r; 58 if(iy==1) return w; 59 else return -1.0/w; | 51 r = (x+s*T[0])+(s*z)*r; 52 if(iy==1) return r; 53 else return -1.0/r; |
| 60} | 54} |