mirror of
https://github.com/jart/cosmopolitan.git
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127 lines
5.7 KiB
C
127 lines
5.7 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/complex.h"
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#include "libc/math.h"
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#include "libc/tinymath/complex.internal.h"
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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_csinhf.c */
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/*-
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* Copyright (c) 2005 Bruce D. Evans and Steven G. Kargl
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Hyperbolic sine of a complex argument z. See s_csinh.c for details.
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*/
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static const float huge = 0x1p127;
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float complex csinhf(float complex z)
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{
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float x, y, h;
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int32_t hx, hy, ix, iy;
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x = crealf(z);
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y = cimagf(z);
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GET_FLOAT_WORD(hx, x);
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GET_FLOAT_WORD(hy, y);
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ix = 0x7fffffff & hx;
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iy = 0x7fffffff & hy;
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if (ix < 0x7f800000 && iy < 0x7f800000) {
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if (iy == 0)
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return CMPLXF(sinhf(x), y);
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if (ix < 0x41100000) /* small x: normal case */
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return CMPLXF(sinhf(x) * cosf(y), coshf(x) * sinf(y));
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/* |x| >= 9, so cosh(x) ~= exp(|x|) */
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if (ix < 0x42b17218) {
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/* x < 88.7: expf(|x|) won't overflow */
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h = expf(fabsf(x)) * 0.5f;
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return CMPLXF(copysignf(h, x) * cosf(y), h * sinf(y));
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} else if (ix < 0x4340b1e7) {
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/* x < 192.7: scale to avoid overflow */
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z = __ldexp_cexpf(CMPLXF(fabsf(x), y), -1);
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return CMPLXF(crealf(z) * copysignf(1, x), cimagf(z));
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} else {
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/* x >= 192.7: the result always overflows */
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h = huge * x;
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return CMPLXF(h * cosf(y), h * h * sinf(y));
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}
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}
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if (ix == 0 && iy >= 0x7f800000)
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return CMPLXF(copysignf(0, x * (y - y)), y - y);
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if (iy == 0 && ix >= 0x7f800000) {
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if ((hx & 0x7fffff) == 0)
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return CMPLXF(x, y);
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return CMPLXF(x, copysignf(0, y));
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}
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if (ix < 0x7f800000 && iy >= 0x7f800000)
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return CMPLXF(y - y, x * (y - y));
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if (ix >= 0x7f800000 && (hx & 0x7fffff) == 0) {
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if (iy >= 0x7f800000)
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return CMPLXF(x * x, x * (y - y));
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return CMPLXF(x * cosf(y), INFINITY * sinf(y));
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}
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return CMPLXF((x * x) * (y - y), (x + x) * (y - y));
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}
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