1 /* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.c */
2 /*
3 * Conversion to float by Ian Lance Taylor, Cygnus Support, [email protected].
4 * Optimized by Bruce D. Evans.
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 /* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */
18 const S1: f64 = -0.166666666416265235595; /* -0x15555554cbac77.0p-55 */
19 const S2: f64 = 0.0083333293858894631756; /* 0x111110896efbb2.0p-59 */
20 const S3: f64 = -0.000198393348360966317347; /* -0x1a00f9e2cae774.0p-65 */
21 const S4: f64 = 0.0000027183114939898219064; /* 0x16cd878c3b46a7.0p-71 */
22
23 #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
k_sinf(x: f64) -> f3224 pub(crate) fn k_sinf(x: f64) -> f32 {
25 let z = x * x;
26 let w = z * z;
27 let r = S3 + z * S4;
28 let s = z * x;
29 ((x + s * (S1 + z * S2)) + s * w * r) as f32
30 }
31