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Get libc/tinymath/ compiling on aarch64
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Justine Tunney
parent
2b73e72d59
commit
135080fd3e
243 changed files with 7773 additions and 4027 deletions
139
libc/tinymath/atan2l.c
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139
libc/tinymath/atan2l.c
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/*-*- 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/tinymath/internal.h"
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#include "libc/tinymath/invtrigl.internal.h"
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#include "libc/tinymath/ldshape.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/e_atan2l.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 SunSoft, 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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*/
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/*
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* See comments in atan2.c.
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* Converted to long double by David Schultz <das@FreeBSD.ORG>.
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*/
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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long double atan2l(long double y, long double x)
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{
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return atan2(y, x);
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}
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#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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/**
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* Returns arc tangent of 𝑦/𝑥.
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*/
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long double atan2l(long double y, long double x)
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{
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#ifdef __x86__
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long double res;
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asm("fpatan"
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: "=t" (res)
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: "0"(x), "u"(y)
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: "st(1)");
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return res;
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#else
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union ldshape ux, uy;
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long double z;
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int m, ex, ey;
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if (isnan(x) || isnan(y))
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return x+y;
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if (x == 1)
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return atanl(y);
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ux.f = x;
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uy.f = y;
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ex = ux.i.se & 0x7fff;
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ey = uy.i.se & 0x7fff;
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m = 2*(ux.i.se>>15) | uy.i.se>>15;
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if (y == 0) {
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switch(m) {
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case 0:
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case 1: return y; /* atan(+-0,+anything)=+-0 */
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case 2: return 2*pio2_hi; /* atan(+0,-anything) = pi */
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case 3: return -2*pio2_hi; /* atan(-0,-anything) =-pi */
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}
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}
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if (x == 0)
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return m&1 ? -pio2_hi : pio2_hi;
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if (ex == 0x7fff) {
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if (ey == 0x7fff) {
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switch(m) {
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case 0: return pio2_hi/2; /* atan(+INF,+INF) */
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case 1: return -pio2_hi/2; /* atan(-INF,+INF) */
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case 2: return 1.5*pio2_hi; /* atan(+INF,-INF) */
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case 3: return -1.5*pio2_hi; /* atan(-INF,-INF) */
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}
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} else {
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switch(m) {
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case 0: return 0.0; /* atan(+...,+INF) */
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case 1: return -0.0; /* atan(-...,+INF) */
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case 2: return 2*pio2_hi; /* atan(+...,-INF) */
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case 3: return -2*pio2_hi; /* atan(-...,-INF) */
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}
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}
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}
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if (ex+120 < ey || ey == 0x7fff)
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return m&1 ? -pio2_hi : pio2_hi;
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/* z = atan(|y/x|) without spurious underflow */
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if ((m&2) && ey+120 < ex) /* |y/x| < 0x1p-120, x<0 */
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z = 0.0;
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else
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z = atanl(fabsl(y/x));
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switch (m) {
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case 0: return z; /* atan(+,+) */
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case 1: return -z; /* atan(-,+) */
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case 2: return 2*pio2_hi-(z-2*pio2_lo); /* atan(+,-) */
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default: /* case 3 */
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return (z-2*pio2_lo)-2*pio2_hi; /* atan(-,-) */
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}
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#endif /* __x86__ */
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}
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#endif
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