| /* kf_sin.c -- float version of k_sin.c |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, [email protected]. |
| */ |
| |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| #include "fdlibm.h" |
| |
| #ifdef __STDC__ |
| static const float |
| #else |
| static float |
| #endif |
| half = 5.0000000000e-01,/* 0x3f000000 */ |
| S1 = -1.6666667163e-01, /* 0xbe2aaaab */ |
| S2 = 8.3333337680e-03, /* 0x3c088889 */ |
| S3 = -1.9841270114e-04, /* 0xb9500d01 */ |
| S4 = 2.7557314297e-06, /* 0x3638ef1b */ |
| S5 = -2.5050759689e-08, /* 0xb2d72f34 */ |
| S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ |
| |
| #ifdef __STDC__ |
| float __kernel_sinf(float x, float y, int iy) |
| #else |
| float __kernel_sinf(x, y, iy) |
| float x,y; int iy; /* iy=0 if y is zero */ |
| #endif |
| { |
| float z,r,v; |
| __int32_t ix; |
| GET_FLOAT_WORD(ix,x); |
| ix &= 0x7fffffff; /* high word of x */ |
| if(ix<0x32000000) /* |x| < 2**-27 */ |
| {if((int)x==0) return x;} /* generate inexact */ |
| z = x*x; |
| v = z*x; |
| r = S2+z*(S3+z*(S4+z*(S5+z*S6))); |
| if(iy==0) return x+v*(S1+z*r); |
| else return x-((z*(half*y-v*r)-y)-v*S1); |
| } |
