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glibc/stdlib/gen-tst-strtod-round.c
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/* Generate table of tests in tst-strtod-round.c from | |
tst-strtod-round-data. | |
Copyright (C) 2012-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#define _GNU_SOURCE | |
#include <assert.h> | |
#include <stdbool.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <mpfr.h> | |
/* Work around incorrect ternary value from mpfr_strtofr | |
<https://sympa.inria.fr/sympa/arc/mpfr/2012-08/msg00005.html>. */ | |
#define WORKAROUND | |
static int | |
string_to_fp (mpfr_t f, const char *s, mpfr_rnd_t rnd) | |
{ | |
#ifdef WORKAROUND | |
mpfr_t f2; | |
mpfr_init2 (f2, 100000); | |
int r0 = mpfr_strtofr (f2, s, NULL, 0, rnd); | |
int r = mpfr_set (f, f2, rnd); | |
mpfr_subnormalize (f, r, rnd); | |
mpfr_clear (f2); | |
return r0 | r; | |
#else | |
int r = mpfr_strtofr (f, s, NULL, 0, rnd); | |
mpfr_subnormalize (f, r, rnd); | |
return r; | |
#endif | |
} | |
static void | |
print_fp (mpfr_t f, const char *suffix, const char *suffix2) | |
{ | |
if (mpfr_inf_p (f)) | |
mpfr_printf ("\t%sINFINITY%s", mpfr_signbit (f) ? "-" : "", suffix2); | |
else | |
mpfr_printf ("\t%Ra%s%s", f, suffix, suffix2); | |
} | |
static void | |
round_str (const char *s, const char *suffix, | |
int prec, int emin, int emax, bool ibm_ld) | |
{ | |
mpfr_t f; | |
mpfr_set_default_prec (prec); | |
mpfr_set_emin (emin); | |
mpfr_set_emax (emax); | |
mpfr_init (f); | |
int r = string_to_fp (f, s, MPFR_RNDD); | |
if (ibm_ld) | |
{ | |
assert (prec == 106 && emin == -1073 && emax == 1024); | |
/* The maximum value in IBM long double has discontiguous | |
mantissa bits. */ | |
mpfr_t max_value; | |
mpfr_init2 (max_value, 107); | |
mpfr_set_str (max_value, "0x1.fffffffffffff7ffffffffffffcp+1023", 0, | |
MPFR_RNDN); | |
if (mpfr_cmpabs (f, max_value) > 0) | |
r = 1; | |
mpfr_clear (max_value); | |
} | |
mpfr_printf ("\t%s,\n", r ? "false" : "true"); | |
print_fp (f, suffix, ",\n"); | |
string_to_fp (f, s, MPFR_RNDN); | |
print_fp (f, suffix, ",\n"); | |
string_to_fp (f, s, MPFR_RNDZ); | |
print_fp (f, suffix, ",\n"); | |
string_to_fp (f, s, MPFR_RNDU); | |
print_fp (f, suffix, ""); | |
mpfr_clear (f); | |
} | |
static void | |
round_for_all (const char *s) | |
{ | |
static const struct fmt { | |
const char *suffix; | |
int prec; | |
int emin; | |
int emax; | |
bool ibm_ld; | |
} formats[7] = { | |
{ "f", 24, -148, 128, false }, | |
{ "", 53, -1073, 1024, false }, | |
{ "L", 53, -1073, 1024, false }, | |
/* This is the Intel extended float format. */ | |
{ "L", 64, -16444, 16384, false }, | |
/* This is the Motorola extended float format. */ | |
{ "L", 64, -16445, 16384, false }, | |
{ "L", 106, -1073, 1024, true }, | |
{ "L", 113, -16493, 16384, false }, | |
}; | |
mpfr_printf (" TEST (\""); | |
const char *p; | |
for (p = s; *p; p++) | |
{ | |
putchar (*p); | |
if ((p - s) % 60 == 59 && p[1]) | |
mpfr_printf ("\"\n\t\""); | |
} | |
mpfr_printf ("\",\n"); | |
int i; | |
for (i = 0; i < 7; i++) | |
{ | |
round_str (s, formats[i].suffix, formats[i].prec, | |
formats[i].emin, formats[i].emax, formats[i].ibm_ld); | |
if (i < 6) | |
mpfr_printf (",\n"); | |
} | |
mpfr_printf ("),\n"); | |
} | |
int | |
main (void) | |
{ | |
char *p = NULL; | |
size_t len; | |
ssize_t nbytes; | |
while ((nbytes = getline (&p, &len, stdin)) != -1) | |
{ | |
if (p[nbytes - 1] == '\n') | |
p[nbytes - 1] = 0; | |
round_for_all (p); | |
free (p); | |
p = NULL; | |
} | |
return 0; | |
} |