mirror of
https://github.com/c3lang/c3c.git
synced 2026-02-27 12:01:16 +00:00
5020caa9c3
* C3_MATH feature This feature allows the usage of noclib math files even when libc is in use. If a nolibc symbol exists, it will be used in place of libc, otherwise it will default to libc. * Added MIT License notices to atan.c3
87 lines
2.1 KiB
Plaintext
87 lines
2.1 KiB
Plaintext
module std::math::nolibc @if(env::NO_LIBC || $feature(C3_MATH));
|
|
|
|
fn float _cosf(float x) @extern("cosf") @weak @nostrip
|
|
{
|
|
uint ix = bitcast(x, uint);
|
|
uint sign = ix >> 31;
|
|
ix &= 0x7fffffff;
|
|
|
|
switch
|
|
{
|
|
case (ix <= 0x3f490fda):
|
|
// |x| < 2**-12
|
|
if (ix < 0x39800000)
|
|
{
|
|
/* raise inexact if x != 0 */
|
|
force_eval_add(x, 0x1p120f);
|
|
return 1.0f;
|
|
}
|
|
return __cosdf(x);
|
|
// |x| ~<= 5*pi/4
|
|
case (ix <= 0x407b53d1):
|
|
// |x| ~> 3*pi/4
|
|
if (ix > 0x4016cbe3) return -__cosdf(sign ? x + S2PI2 : x - S2PI2);
|
|
return sign ? __sindf(x + S1PI2) : __sindf(S1PI2 - x);
|
|
// |x| ~<= 9*pi/4
|
|
case (ix <= 0x40e231d5):
|
|
if (ix > 0x40afeddf) return __cosdf(sign ? x + S4PI2 : x - S4PI2);
|
|
return sign ? __sindf((double)(-x) - S3PI2) : __sindf(x - S3PI2);
|
|
}
|
|
|
|
// general argument reduction needed
|
|
double y @noinit;
|
|
switch (__rem_pio2f(x, &y) & 3)
|
|
{
|
|
case 0: return __cosdf(y);
|
|
case 1: return __sindf(-y);
|
|
case 2: return -__cosdf(y);
|
|
default: return __sindf(y);
|
|
}
|
|
}
|
|
|
|
/* origin: FreeBSD /usr/src/lib/msun/src/s_cos.c */
|
|
/*
|
|
* ====================================================
|
|
* 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
fn double _cos(double x) @extern("cos") @weak @nostrip
|
|
{
|
|
// High word of x.
|
|
uint ix = (uint)(bitcast(x, ulong) >> 32);
|
|
ix &= 0x7fffffff;
|
|
|
|
switch
|
|
{
|
|
// |x| ~< pi/4
|
|
case ix <= 0x3fe921fb:
|
|
if (ix < 0x3e46a09e)
|
|
{
|
|
// |x| < 2**-27 * sqrt(2)
|
|
// raise inexact if x!=0
|
|
force_eval_add(x, 0x1p120f);
|
|
return 1.0;
|
|
}
|
|
return __cos(x, 0);
|
|
case ix >= 0x7ff00000:
|
|
// cos(Inf or NaN) is NaN
|
|
return x - x;
|
|
default:
|
|
// argument reduction
|
|
double[2] y @noinit;
|
|
switch (__rem_pio2(x, &y) & 3)
|
|
{
|
|
case 0: return __cos(y[0], y[1]);
|
|
case 1: return -__sin(y[0], y[1], 1);
|
|
case 2: return -__cos(y[0], y[1]);
|
|
default: return __sin(y[0], y[1], 1);
|
|
}
|
|
}
|
|
}
|