k_sinf.c (6e10a447f8aea9fe3d893c5da92f415c943fc50d) k_sinf.c (4ce51209523e3ebb226a036e9ad22025a501972d)
1/* k_sinf.c -- float version of k_sin.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 * Optimized by Bruce D. Evans.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
1/* k_sinf.c -- float version of k_sin.c
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 * Optimized by Bruce D. Evans.
4 */
5
6/*
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
13 * is preserved.
14 * ====================================================
15 */
16
17#ifndef INLINE_KERNEL_SINF
17#ifndef lint
18static char rcsid[] = "$FreeBSD$";
19#endif
18#ifndef lint
19static char rcsid[] = "$FreeBSD$";
20#endif
21#endif
20
21#include "math.h"
22#include "math_private.h"
23
24/* |sin(x)/x - s(x)| < 2**-32.5 (~[-1.57e-10, 1.572e-10]). */
25static const float
26half = 0.5,
27S1 = -0xaaaaab.0p-26, /* -0.16666667163 */
28S2 = 0x8888bb.0p-30, /* 0.0083333803341 */
29S3 = -0xd02de1.0p-36, /* -0.00019853517006 */
30S4 = 0xbe6dbe.0p-42; /* 0.0000028376084629 */
31
22
23#include "math.h"
24#include "math_private.h"
25
26/* |sin(x)/x - s(x)| < 2**-32.5 (~[-1.57e-10, 1.572e-10]). */
27static const float
28half = 0.5,
29S1 = -0xaaaaab.0p-26, /* -0.16666667163 */
30S2 = 0x8888bb.0p-30, /* 0.0083333803341 */
31S3 = -0xd02de1.0p-36, /* -0.00019853517006 */
32S4 = 0xbe6dbe.0p-42; /* 0.0000028376084629 */
33
34#ifdef INLINE_KERNEL_SINF
35extern inline
36#endif
32float
33__kernel_sinf(float x, float y, int iy)
34{
35 float z,r,v;
36
37 z = x*x;
38 v = z*x;
39 r = S2+z*(S3+z*S4);
40 if(iy==0) return x+v*(S1+z*r);
41 else return x-((z*(half*y-v*r)-y)-v*S1);
42}
37float
38__kernel_sinf(float x, float y, int iy)
39{
40 float z,r,v;
41
42 z = x*x;
43 v = z*x;
44 r = S2+z*(S3+z*S4);
45 if(iy==0) return x+v*(S1+z*r);
46 else return x-((z*(half*y-v*r)-y)-v*S1);
47}