mirror of
https://github.com/jart/cosmopolitan.git
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592f6ebc20
- Write some more unit tests - memcpy() on ARM is now faster - Address the Musl complex math FIXME comments - Some libm funcs like pow() now support setting errno - Import the latest and greatest math functions from ARM - Use more accurate atan2f() and log1pf() implementations - atoi() and atol() will no longer saturate or clobber errno
68 lines
3.2 KiB
C
68 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=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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__static_yoink("musl_libc_notice");
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/**
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* Returns euclidean distance.
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*
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* Max observed error is 1 ulp.
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*/
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float hypotf(float x, float y)
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{
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union {float f; uint32_t i;} ux = {x}, uy = {y}, ut;
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float_t z;
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ux.i &= -1U>>1;
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uy.i &= -1U>>1;
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if (ux.i < uy.i) {
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ut = ux;
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ux = uy;
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uy = ut;
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}
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x = ux.f;
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y = uy.f;
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if (uy.i == 0xff<<23)
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return y;
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if (ux.i >= 0xff<<23 || uy.i == 0 || ux.i - uy.i >= 25<<23)
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return x + y;
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z = 1;
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if (ux.i >= (0x7f+60)<<23) {
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z = 0x1p90f;
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x *= 0x1p-90f;
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y *= 0x1p-90f;
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} else if (uy.i < (0x7f-60)<<23) {
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z = 0x1p-90f;
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x *= 0x1p90f;
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y *= 0x1p90f;
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}
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return z*sqrtf((double)x*x + (double)y*y);
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}
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