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 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "$NetBSD: k_sinf.c,v 1.4 1995/05/10 20:46:33 jtc Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 #ifdef __STDC__ 24 static const float 25 #else 26 static float 27 #endif 28 half = 5.0000000000e-01,/* 0x3f000000 */ 29 S1 = -1.6666667163e-01, /* 0xbe2aaaab */ 30 S2 = 8.3333337680e-03, /* 0x3c088889 */ 31 S3 = -1.9841270114e-04, /* 0xb9500d01 */ 32 S4 = 2.7557314297e-06, /* 0x3638ef1b */ 33 S5 = -2.5050759689e-08, /* 0xb2d72f34 */ 34 S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ 35 36 #ifdef __STDC__ 37 float __kernel_sinf(float x, float y, int iy) 38 #else 39 float __kernel_sinf(x, y, iy) 40 float x,y; int iy; /* iy=0 if y is zero */ 41 #endif 42 { 43 float z,r,v; 44 int32_t ix; 45 GET_FLOAT_WORD(ix,x); 46 ix &= 0x7fffffff; /* high word of x */ 47 if(ix<0x32000000) /* |x| < 2**-27 */ 48 {if((int)x==0) return x;} /* generate inexact */ 49 z = x*x; 50 v = z*x; 51 r = S2+z*(S3+z*(S4+z*(S5+z*S6))); 52 if(iy==0) return x+v*(S1+z*r); 53 else return x-((z*(half*y-v*r)-y)-v*S1); 54 } 55