mirror of
https://github.com/jart/cosmopolitan.git
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cc1732bc42
- Perform some housekeeping on scalar math function code - Import ARM's Optimized Routines for SIMD string processing - Upgrade to latest Chromium zlib and enable more SIMD optimizations
129 lines
5.1 KiB
C
129 lines
5.1 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 © 2005-2020 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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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(".ident\t\"\\n\\n\
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OpenBSD libm (ISC License)\\n\
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Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>\"");
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asm(".include \"libc/disclaimer.inc\"");
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// clang-format off
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/* origin: OpenBSD /usr/src/lib/libm/src/polevll.c */
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/*
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* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Evaluate polynomial
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*
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*
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* SYNOPSIS:
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*
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* int N;
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* long double x, y, coef[N+1], polevl[];
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*
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* y = polevll( x, coef, N );
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*
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*
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* DESCRIPTION:
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*
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* Evaluates polynomial of degree N:
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*
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* 2 N
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* y = C + C x + C x +...+ C x
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* 0 1 2 N
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*
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* Coefficients are stored in reverse order:
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*
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* coef[0] = C , ..., coef[N] = C .
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* N 0
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*
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* The function p1evll() assumes that coef[N] = 1.0 and is
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* omitted from the array. Its calling arguments are
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* otherwise the same as polevll().
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*
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*
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* SPEED:
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*
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* In the interest of speed, there are no checks for out
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* of bounds arithmetic. This routine is used by most of
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* the functions in the library. Depending on available
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* equipment features, the user may wish to rewrite the
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* program in microcode or assembly language.
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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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#else
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/*
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* Polynomial evaluator:
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* P[0] x^n + P[1] x^(n-1) + ... + P[n]
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*/
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long double __polevll(long double x, const long double *P, int n)
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{
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long double y;
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y = *P++;
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do {
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y = y * x + *P++;
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} while (--n);
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return y;
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}
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/*
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* Polynomial evaluator:
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* x^n + P[0] x^(n-1) + P[1] x^(n-2) + ... + P[n]
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*/
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long double __p1evll(long double x, const long double *P, int n)
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{
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long double y;
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n -= 1;
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y = x + *P++;
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do {
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y = y * x + *P++;
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} while (--n);
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return y;
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}
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#endif
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