| /* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.c */ |
| /* |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
| * Optimized by Bruce D. Evans. |
| */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| /* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */ |
| const S1: f64 = -0.166666666416265235595; /* -0x15555554cbac77.0p-55 */ |
| const S2: f64 = 0.0083333293858894631756; /* 0x111110896efbb2.0p-59 */ |
| const S3: f64 = -0.000198393348360966317347; /* -0x1a00f9e2cae774.0p-65 */ |
| const S4: f64 = 0.0000027183114939898219064; /* 0x16cd878c3b46a7.0p-71 */ |
| |
| #[inline] |
| pub fn k_sinf(x: f64) -> f32 { |
| let z = x * x; |
| let w = z * z; |
| let r = S3 + z * S4; |
| let s = z * x; |
| ((x + s * (S1 + z * S2)) + s * w * r) as f32 |
| } |
