mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
c3440d040c
- More timspec_*() and timeval_*() APIs have been introduced. - The copyfd() function is now simplified thanks to POSIX rules. - More Cosmo-specific APIs have been moved behind the COSMO define. - The setitimer() polyfill for Windows NT is now much higher quality. - Fixed build error for MODE=aarch64 due to -mstringop-strategy=loop. - This change introduces `make MODE=nox87 toolchain` which makes it possible to build programs using your cosmocc toolchain that don't have legacy fpu instructions. This is useful, for example, if you want to have a ~22kb tinier blink virtual machine.
118 lines
4.5 KiB
C
118 lines
4.5 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/math.h"
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#include "libc/runtime/runtime.h"
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#include "libc/tinymath/feval.internal.h"
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#include "libc/tinymath/kernel.internal.h"
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asm(".ident\t\"\\n\\n\
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fdlibm (fdlibm license)\\n\
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Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.\"");
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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// clang-format off
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/* origin: FreeBSD /usr/src/lib/msun/src/s_sin.c */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#define asuint64(f) ((union{double _f; uint64_t _i;}){f})._i
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#define gethighw(hi,d) (hi) = asuint64(d) >> 32
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/**
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* Returns sine and cosine of 𝑥.
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* @note should take ~10ns
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*/
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void sincos(double x, double *sin, double *cos)
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{
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double y[2], s, c;
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uint32_t ix;
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unsigned n;
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gethighw(ix, x);
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ix &= 0x7fffffff;
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/* |x| ~< pi/4 */
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if (ix <= 0x3fe921fb) {
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/* if |x| < 2**-27 * sqrt(2) */
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if (ix < 0x3e46a09e) {
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/* raise inexact if x!=0 and underflow if subnormal */
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feval(ix < 0x00100000 ? x/0x1p120f : x+0x1p120f);
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*sin = x;
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*cos = 1.0;
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return;
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}
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*sin = __sin(x, 0.0, 0);
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*cos = __cos(x, 0.0);
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return;
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}
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/* sincos(Inf or NaN) is NaN */
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if (ix >= 0x7ff00000) {
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*sin = *cos = x - x;
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return;
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}
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/* argument reduction needed */
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n = __rem_pio2(x, y);
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s = __sin(y[0], y[1], 1);
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c = __cos(y[0], y[1]);
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switch (n&3) {
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case 0:
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*sin = s;
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*cos = c;
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break;
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case 1:
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*sin = c;
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*cos = -s;
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break;
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case 2:
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*sin = -s;
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*cos = -c;
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break;
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case 3:
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default:
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*sin = -c;
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*cos = s;
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break;
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}
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}
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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__weak_reference(sincos, sincosl);
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#endif
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