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Add long double printf formatting support

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You can now easily print numbers that have 80 bits of precision. This
change also imports many of the test vectors from the gdtoa codebase.
This commit is contained in:
Justine Tunney 2022-06-14 02:12:32 -07:00
parent dae0583ee5
commit 1c387727fe
9 changed files with 808 additions and 287 deletions
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20
third_party/gdtoa/gdtoa.h vendored
View file

@ -3,6 +3,26 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/**
* Configures g_*fmt()
*
* @param ic
* 0 ==> Infinity or NaN
* 1 ==> infinity or nan
* 2 ==> INFINITY or NAN
* 3 ==> Inf or NaN
* 4 ==> inf or nan
* 5 ==> INF or NAN
* @param ic determines if NaNs are rendered as NaN(...)
* 0 ==> no
* 1 ==> yes
* 2 ==> no for default NaN values; yes otherwise
* @param ns determines sign of NaN values reported
* 0 ==> distinguish NaN and -NaN
* 1 ==> report both as NaN
*/
#define NIK(ic, nb, ns) (ic + 6 * (nb + 3 * ns))
enum {
/* return values from strtodg */
STRTOG_Zero = 0,

76
third_party/gdtoa/strtodnrp.c vendored
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@ -1,76 +0,0 @@
/*-*- 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 */
/* This is a variant of strtod that works on Intel ia32 systems */
/* with the default extended-precision arithmetic -- it does not */
/* require setting the precision control to 53 bits. */
double
strtod(const char *s, char **sp)
{
static const FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI, 0 /*unused*/ };
ULong bits[2];
Long exp;
int k;
union { ULong L[2]; double d; } u;
k = strtodg(s, sp, &fpi, &exp, bits);
switch(k & STRTOG_Retmask) {
case STRTOG_NoNumber:
case STRTOG_Zero:
u.L[0] = u.L[1] = 0;
break;
case STRTOG_Normal:
u.L[0] = bits[0];
u.L[1] = (bits[1] & ~0x100000) | ((exp + 0x3ff + 52) << 20);
break;
case STRTOG_Denormal:
u.L[0] = bits[0];
u.L[1] = bits[1];
break;
case STRTOG_Infinite:
u.L[1] = 0x7ff00000;
u.L[0] = 0;
break;
case STRTOG_NaN:
u.L[0] = d_QNAN0;
u.L[1] = d_QNAN1;
break;
case STRTOG_NaNbits:
u.L[1] = 0x7ff00000 | bits[1];
u.L[0] = bits[0];
}
if (k & STRTOG_Neg)
u.L[1] |= 0x80000000L;
return u.d;
}