mirror of
https://github.com/c3lang/c3c.git
synced 2026-02-27 12:01:16 +00:00
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
module std::math::nolibc;
|
|
|
|
$if (!env::COMPILER_LIBC_AVAILABLE):
|
|
|
|
/* 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]).
|
|
fn float __sindf(double x) @extern("__sindf") @weak
|
|
{
|
|
const S1F = -0x15555554cbac77.0p-55; /* -0.166666666416265235595 */
|
|
const S2F = 0x111110896efbb2.0p-59; /* 0.0083333293858894631756 */
|
|
const S3F = -0x1a00f9e2cae774.0p-65; /* -0.000198393348360966317347 */
|
|
const S4F = 0x16cd878c3b46a7.0p-71; /* 0.0000027183114939898219064 */
|
|
double z = x * x;
|
|
double w = z * z;
|
|
double r = S3F + z * S4F;
|
|
double s = z * x;
|
|
return (float)((x + s * (S1F + z * S2F)) + s * w * r);
|
|
}
|
|
|
|
$endif;
|