1 /* kf_sin.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 #include "fdlibm.h"
17
18 static const float half = 5.0000000000e-01, /* 0x3f000000 */
19 S1 = -1.6666667163e-01, /* 0xbe2aaaab */
20 S2 = 8.3333337680e-03, /* 0x3c088889 */
21 S3 = -1.9841270114e-04, /* 0xb9500d01 */
22 S4 = 2.7557314297e-06, /* 0x3638ef1b */
23 S5 = -2.5050759689e-08, /* 0xb2d72f34 */
24 S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */
25
26 float
__kernel_sinf(float x,float y,int iy)27 __kernel_sinf(float x, float y, int iy)
28 {
29 float z, r, v;
30 __int32_t ix;
31 GET_FLOAT_WORD(ix, x);
32 ix &= 0x7fffffff; /* high word of x */
33 if (ix < 0x32000000) /* |x| < 2**-27 */
34 return __math_inexactf(x); /* generate inexact */
35 z = x * x;
36 v = z * x;
37 r = S2 + z * (S3 + z * (S4 + z * (S5 + z * S6)));
38 if (iy == 0)
39 return x + v * (S1 + z * r);
40 else
41 return x - ((z * (half * y - v * r) - y) - v * S1);
42 }
43
