k_sinf.c revision 152647
12116Sjkh/* k_sinf.c -- float version of k_sin.c 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3151796Sbde * Optimized by Bruce D. Evans. 42116Sjkh */ 52116Sjkh 62116Sjkh/* 72116Sjkh * ==================================================== 82116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 92116Sjkh * 102116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 112116Sjkh * Permission to use, copy, modify, and distribute this 128870Srgrimes * software is freely granted, provided that this notice 132116Sjkh * is preserved. 142116Sjkh * ==================================================== 152116Sjkh */ 162116Sjkh 17152647Sbde#ifndef INLINE_KERNEL_SINF 182116Sjkh#ifndef lint 1950476Speterstatic char rcsid[] = "$FreeBSD: head/lib/msun/src/k_sinf.c 152647 2005-11-21 04:57:12Z bde $"; 202116Sjkh#endif 21152647Sbde#endif 222116Sjkh 232116Sjkh#include "math.h" 242116Sjkh#include "math_private.h" 252116Sjkh 26152341Sbde/* |sin(x)/x - s(x)| < 2**-32.5 (~[-1.57e-10, 1.572e-10]). */ 278870Srgrimesstatic const float 28151796Sbdehalf = 0.5, 29152341SbdeS1 = -0xaaaaab.0p-26, /* -0.16666667163 */ 30152341SbdeS2 = 0x8888bb.0p-30, /* 0.0083333803341 */ 31152341SbdeS3 = -0xd02de1.0p-36, /* -0.00019853517006 */ 32152341SbdeS4 = 0xbe6dbe.0p-42; /* 0.0000028376084629 */ 332116Sjkh 34152647Sbde#ifdef INLINE_KERNEL_SINF 35152647Sbdeextern inline 36152647Sbde#endif 3797413Salfredfloat 3897413Salfred__kernel_sinf(float x, float y, int iy) 392116Sjkh{ 402116Sjkh float z,r,v; 41151620Sbde 422116Sjkh z = x*x; 432116Sjkh v = z*x; 44151796Sbde r = S2+z*(S3+z*S4); 452116Sjkh if(iy==0) return x+v*(S1+z*r); 462116Sjkh else return x-((z*(half*y-v*r)-y)-v*S1); 472116Sjkh} 48