Update.
[glibc.git] / sysdeps / libm-ieee754 / k_sinf.c
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1 /* k_sinf.c -- float version of k_sin.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 * ====================================================
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
20 #include "math.h"
21 #include "math_private.h"
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 */
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
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);