1 /*
2 * Single-precision sin/cos function.
3 *
4 * Copyright (c) 2018, Arm Limited.
5 * SPDX-License-Identifier: MIT
6 */
7
8 #if WANT_SINGLEPREC
9 #include "single/s_sincosf.c"
10 #else
11
12 #include <stdint.h>
13 #include <math.h>
14 #include "math_config.h"
15 #include "sincosf.h"
16
17 /* Fast sincosf implementation. Worst-case ULP is 0.5607, maximum relative
18 error is 0.5303 * 2^-23. A single-step range reduction is used for
19 small values. Large inputs have their range reduced using fast integer
20 arithmetic. */
21 void
sincosf(float y,float * sinp,float * cosp)22 sincosf (float y, float *sinp, float *cosp)
23 {
24 double x = y;
25 double s;
26 int n;
27 const sincos_t *p = &__sincosf_table[0];
28
29 if (abstop12 (y) < abstop12 (pio4))
30 {
31 double x2 = x * x;
32
33 if (unlikely (abstop12 (y) < abstop12 (0x1p-12f)))
34 {
35 if (unlikely (abstop12 (y) < abstop12 (0x1p-126f)))
36 /* Force underflow for tiny y. */
37 force_eval_float (x2);
38 *sinp = y;
39 *cosp = 1.0f;
40 return;
41 }
42
43 sincosf_poly (x, x2, p, 0, sinp, cosp);
44 }
45 else if (abstop12 (y) < abstop12 (120.0f))
46 {
47 x = reduce_fast (x, p, &n);
48
49 /* Setup the signs for sin and cos. */
50 s = p->sign[n & 3];
51
52 if (n & 2)
53 p = &__sincosf_table[1];
54
55 sincosf_poly (x * s, x * x, p, n, sinp, cosp);
56 }
57 else if (likely (abstop12 (y) < abstop12 (INFINITY)))
58 {
59 uint32_t xi = asuint (y);
60 int sign = xi >> 31;
61
62 x = reduce_large (xi, &n);
63
64 /* Setup signs for sin and cos - include original sign. */
65 s = p->sign[(n + sign) & 3];
66
67 if ((n + sign) & 2)
68 p = &__sincosf_table[1];
69
70 sincosf_poly (x * s, x * x, p, n, sinp, cosp);
71 }
72 else
73 {
74 /* Return NaN if Inf or NaN for both sin and cos. */
75 *sinp = *cosp = y - y;
76 #if WANT_ERRNO
77 /* Needed to set errno for +-Inf, the add is a hack to work
78 around a gcc register allocation issue: just passing y
79 affects code generation in the fast path. */
80 __math_invalidf (y + y);
81 #endif
82 }
83 }
84
85 #endif
86