2 * Copyright (c) 2017 Steven G. Kargl
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * See ../src/s_sinpi.c for implementation details.
31 #define INLINE_KERNEL_SINDF
32 #define INLINE_KERNEL_COSDF
35 #include "math_private.h"
39 #define __kernel_cospif(x) (__kernel_cosdf(M_PI * (x)))
40 #define __kernel_sinpif(x) (__kernel_sindf(M_PI * (x)))
43 pi_hi = 3.14160156e+00F, /* 0x40491000 */
44 pi_lo = -8.90890988e-06F; /* 0xb715777a */
46 volatile static const float vzero = 0;
54 GET_FLOAT_WORD(hx, x);
56 SET_FLOAT_WORD(ax, ix);
58 if (ix < 0x3f800000) { /* |x| < 1 */
59 if (ix < 0x3e800000) { /* |x| < 0.25 */
60 if (ix < 0x38800000) { /* |x| < 0x1p-14 */
63 SET_FLOAT_WORD(hi, hx & 0xffff0000);
65 lo = x * 0x1p23F - hi;
66 s = (pi_lo + pi_hi) * lo + pi_lo * hi +
68 return (s * 0x1p-23F);
71 s = __kernel_sinpif(ax);
72 return ((hx & 0x80000000) ? -s : s);
75 if (ix < 0x3f000000) /* |x| < 0.5 */
76 s = __kernel_cospif(0.5F - ax);
77 else if (ix < 0x3f400000) /* |x| < 0.75 */
78 s = __kernel_cospif(ax - 0.5F);
80 s = __kernel_sinpif(1 - ax);
81 return ((hx & 0x80000000) ? -s : s);
84 if (ix < 0x4b000000) { /* 1 <= |x| < 0x1p23 */
85 /* Determine integer part of ax. */
86 j0 = ((ix >> 23) & 0xff) - 0x7f;
87 ix &= ~(0x007fffff >> j0);
88 SET_FLOAT_WORD(x, ix);
91 GET_FLOAT_WORD(ix, ax);
96 if (ix < 0x3f000000) { /* |x| < 0.5 */
97 if (ix < 0x3e800000) /* |x| < 0.25 */
98 s = __kernel_sinpif(ax);
100 s = __kernel_cospif(0.5F - ax);
102 if (ix < 0x3f400000) /* |x| < 0.75 */
103 s = __kernel_cospif(ax - 0.5F);
105 s = __kernel_sinpif(1 - ax);
109 s = (j0 & 1) ? -s : s;
111 return ((hx & 0x80000000) ? -s : s);
114 /* x = +-inf or nan. */
115 if (ix >= 0x7f800000)
116 return (vzero / vzero);
119 * |x| >= 0x1p23 is always an integer, so return +-0.
121 return (copysignf(0, x));