k_sinf.c (1355B)
1 /* k_sinf.c -- float version of k_sin.c 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #ifndef lint 17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/k_sinf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 static const float 24 half = 5.0000000000e-01,/* 0x3f000000 */ 25 S1 = -1.6666667163e-01, /* 0xbe2aaaab */ 26 S2 = 8.3333337680e-03, /* 0x3c088889 */ 27 S3 = -1.9841270114e-04, /* 0xb9500d01 */ 28 S4 = 2.7557314297e-06, /* 0x3638ef1b */ 29 S5 = -2.5050759689e-08, /* 0xb2d72f34 */ 30 S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ 31 32 float 33 __kernel_sinf(float x, float y, int iy) 34 { 35 float z,r,v; 36 int32_t ix; 37 GET_FLOAT_WORD(ix,x); 38 ix &= 0x7fffffff; /* high word of x */ 39 if(ix<0x32000000) /* |x| < 2**-27 */ 40 {if((int)x==0) return x;} /* generate inexact */ 41 z = x*x; 42 v = z*x; 43 r = S2+z*(S3+z*(S4+z*(S5+z*S6))); 44 if(iy==0) return x+v*(S1+z*r); 45 else return x-((z*(half*y-v*r)-y)-v*S1); 46 }