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Clean up gdtoa code

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This commit is contained in:
Justine Tunney 2021-08-19 06:07:37 -07:00
parent 7341336b1a
commit da45c7c80b
48 changed files with 2808 additions and 4721 deletions
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147
third_party/gdtoa/strtodI.c vendored
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@ -1,156 +1,113 @@
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
╚──────────────────────────────────────────────────────────────────────────────╝
│ │
│ The author of this software is David M. Gay. │
│ Please send bug reports to David M. Gay <dmg@acm.org> │
│ or Justine Tunney <jtunney@gmail.com> │
│ │
│ Copyright (C) 1998, 1999 by Lucent Technologies │
│ All Rights Reserved │
│ │
│ Permission to use, copy, modify, and distribute this software and │
│ its documentation for any purpose and without fee is hereby │
│ granted, provided that the above copyright notice appear in all │
│ copies and that both that the copyright notice and this │
│ permission notice and warranty disclaimer appear in supporting │
│ documentation, and that the name of Lucent or any of its entities │
│ not be used in advertising or publicity pertaining to │
│ distribution of the software without specific, written prior │
│ permission. │
│ │
│ LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, │
│ INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. │
│ IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY │
│ SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES │
│ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER │
│ IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, │
│ ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF │
│ THIS SOFTWARE. │
│ │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "third_party/gdtoa/gdtoa.internal.h"
/* clang-format off */
/****************************************************************
The author of this software is David M. Gay.
Copyright (C) 1998, 2000 by Lucent Technologies
All Rights Reserved
Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name of Lucent or any of its entities
not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
****************************************************************/
/* Please send bug reports to David M. Gay (dmg at acm dot org,
* with " at " changed at "@" and " dot " changed to "."). */
static double
ulpdown(U *d)
{
double u;
ULong *L = d->L;
u = ulp(d);
if (!(L[_1] | (L[_0] & 0xfffff))
&& (L[_0] & 0x7ff00000) > 0x00100000)
if (!(L[0] | (L[1] & 0xfffff))
&& (L[1] & 0x7ff00000) > 0x00100000)
u *= 0.5;
return u;
}
}
int
strtodI(CONST char *s, char **sp, double *dd)
strtodI(const char *s, char **sp, double *dd)
{
static const FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI, 0 /*unused*/ };
ULong bits[2], sign;
Long exp;
int j, k;
U *u;
k = strtodg(s, sp, &fpi, &exp, bits);
u = (U*)dd;
sign = k & STRTOG_Neg ? 0x80000000L : 0;
switch(k & STRTOG_Retmask) {
case STRTOG_NoNumber:
case STRTOG_NoNumber:
dval(&u[0]) = dval(&u[1]) = 0.;
break;
case STRTOG_Zero:
case STRTOG_Zero:
dval(&u[0]) = dval(&u[1]) = 0.;
#ifdef Sudden_Underflow
if (k & STRTOG_Inexact) {
if (sign)
word0(&u[0]) = 0x80100000L;
else
word0(&u[1]) = 0x100000L;
}
break;
#else
goto contain;
#endif
case STRTOG_Denormal:
case STRTOG_Denormal:
word1(&u[0]) = bits[0];
word0(&u[0]) = bits[1];
goto contain;
case STRTOG_Normal:
case STRTOG_Normal:
word1(&u[0]) = bits[0];
word0(&u[0]) = (bits[1] & ~0x100000) | ((exp + 0x3ff + 52) << 20);
contain:
contain:
j = k & STRTOG_Inexact;
if (sign) {
word0(&u[0]) |= sign;
j = STRTOG_Inexact - j;
}
}
switch(j) {
case STRTOG_Inexlo:
#ifdef Sudden_Underflow
if ((u->L[_0] & 0x7ff00000) < 0x3500000) {
word0(&u[1]) = word0(&u[0]) + 0x3500000;
word1(&u[1]) = word1(&u[0]);
dval(&u[1]) += ulp(&u[1]);
word0(&u[1]) -= 0x3500000;
if (!(word0(&u[1]) & 0x7ff00000)) {
word0(&u[1]) = sign;
word1(&u[1]) = 0;
}
}
else
#endif
case STRTOG_Inexlo:
dval(&u[1]) = dval(&u[0]) + ulp(&u[0]);
break;
case STRTOG_Inexhi:
case STRTOG_Inexhi:
dval(&u[1]) = dval(&u[0]);
#ifdef Sudden_Underflow
if ((word0(&u[0]) & 0x7ff00000) < 0x3500000) {
word0(&u[0]) += 0x3500000;
dval(&u[0]) -= ulpdown(u);
word0(&u[0]) -= 0x3500000;
if (!(word0(&u[0]) & 0x7ff00000)) {
word0(&u[0]) = sign;
word1(&u[0]) = 0;
}
}
else
#endif
dval(&u[0]) -= ulpdown(u);
break;
default:
default:
dval(&u[1]) = dval(&u[0]);
}
}
break;
case STRTOG_Infinite:
case STRTOG_Infinite:
word0(&u[0]) = word0(&u[1]) = sign | 0x7ff00000;
word1(&u[0]) = word1(&u[1]) = 0;
if (k & STRTOG_Inexact) {
if (sign) {
word0(&u[1]) = 0xffefffffL;
word1(&u[1]) = 0xffffffffL;
}
}
else {
word0(&u[0]) = 0x7fefffffL;
word1(&u[0]) = 0xffffffffL;
}
}
}
break;
case STRTOG_NaN:
case STRTOG_NaN:
u->L[0] = (u+1)->L[0] = d_QNAN0;
u->L[1] = (u+1)->L[1] = d_QNAN1;
break;
case STRTOG_NaNbits:
case STRTOG_NaNbits:
word0(&u[0]) = word0(&u[1]) = 0x7ff00000 | sign | bits[1];
word1(&u[0]) = word1(&u[1]) = bits[0];
}
return k;
}
return k;
}