236 lines
7.3 KiB
C
236 lines
7.3 KiB
C
|
/* Test for correct rounding of printf floating-point output.
|
||
|
|
Copyright (C) 2012-2022 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
|
||
|
|
<https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <array_length.h>
|
||
|
|
#include <fenv.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
struct dec_test {
|
||
|
|
double d;
|
||
|
|
const char *fmt;
|
||
|
|
const char *rd, *rn, *rz, *ru;
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct dec_test dec_tests[] = {
|
||
|
|
{ 1.5, "%.0f", "1", "2", "1", "2" },
|
||
|
|
{ -1.5, "%.0f", "-2", "-2", "-1", "-1" },
|
||
|
|
{ 2.5, "%.0f", "2", "2", "2", "3" },
|
||
|
|
{ -2.5, "%.0f", "-3", "-2", "-2", "-2" },
|
||
|
|
{ 1.4999, "%.0f", "1", "1", "1", "2" },
|
||
|
|
{ -1.4999, "%.0f", "-2", "-1", "-1", "-1" },
|
||
|
|
{ 1.5001, "%.0f", "1", "2", "1", "2" },
|
||
|
|
{ -1.5001, "%.0f", "-2", "-2", "-1", "-1" },
|
||
|
|
{ 2.4999, "%.0f", "2", "2", "2", "3" },
|
||
|
|
{ -2.4999, "%.0f", "-3", "-2", "-2", "-2" },
|
||
|
|
{ 2.5001, "%.0f", "2", "3", "2", "3" },
|
||
|
|
{ -2.5001, "%.0f", "-3", "-3", "-2", "-2" },
|
||
|
|
{ 1.0 / 3.0, "%f", "0.333333", "0.333333", "0.333333", "0.333334" },
|
||
|
|
{ -1.0 / 3.0, "%f", "-0.333334", "-0.333333", "-0.333333", "-0.333333" },
|
||
|
|
{ 0.2500001, "%.2e", "2.50e-01", "2.50e-01", "2.50e-01", "2.51e-01" },
|
||
|
|
{ -0.2500001, "%.2e", "-2.51e-01", "-2.50e-01", "-2.50e-01", "-2.50e-01" },
|
||
|
|
{ 1000001.0, "%.1e", "1.0e+06", "1.0e+06", "1.0e+06", "1.1e+06" },
|
||
|
|
{ -1000001.0, "%.1e", "-1.1e+06", "-1.0e+06", "-1.0e+06", "-1.0e+06" },
|
||
|
|
};
|
||
|
|
|
||
|
|
static int
|
||
|
|
test_dec_in_one_mode (double d, const char *fmt, const char *expected,
|
||
|
|
const char *mode_name)
|
||
|
|
{
|
||
|
|
char buf[100];
|
||
|
|
int ret = snprintf (buf, sizeof buf, fmt, d);
|
||
|
|
if (ret <= 0 || ret >= (int) sizeof buf)
|
||
|
|
{
|
||
|
|
printf ("snprintf for %a returned %d\n", d, ret);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (strcmp (buf, expected) == 0)
|
||
|
|
return 0;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
printf ("snprintf (\"%s\", %a) returned \"%s\" not \"%s\" (%s)\n",
|
||
|
|
fmt, d, buf, expected, mode_name);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct hex_test
|
||
|
|
{
|
||
|
|
double d;
|
||
|
|
const char *fmt;
|
||
|
|
const char *rd[4], *rn[4], *rz[4], *ru[4];
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct hex_test hex_tests[] =
|
||
|
|
{
|
||
|
|
{
|
||
|
|
0x1.fffffp+4, "%.1a",
|
||
|
|
{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },
|
||
|
|
{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" },
|
||
|
|
{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },
|
||
|
|
{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
-0x1.fffffp+4, "%.1a",
|
||
|
|
{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },
|
||
|
|
{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },
|
||
|
|
{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" },
|
||
|
|
{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
0x1.88p+4, "%.1a",
|
||
|
|
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
|
||
|
|
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
|
||
|
|
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
|
||
|
|
{ "0x1.9p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
-0x1.88p+4, "%.1a",
|
||
|
|
{ "-0x1.9p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
|
||
|
|
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
|
||
|
|
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
|
||
|
|
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
0x1.78p+4, "%.1a",
|
||
|
|
{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
|
||
|
|
{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
|
||
|
|
{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
|
||
|
|
{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
-0x1.78p+4, "%.1a",
|
||
|
|
{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
|
||
|
|
{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
|
||
|
|
{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
|
||
|
|
{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
64.0 / 3.0, "%.1a",
|
||
|
|
{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },
|
||
|
|
{ "0x1.5p+4", "0x2.bp+3", "0x5.5p+2", "0xa.bp+1" },
|
||
|
|
{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },
|
||
|
|
{ "0x1.6p+4", "0x2.bp+3", "0x5.6p+2", "0xa.bp+1" }
|
||
|
|
},
|
||
|
|
{
|
||
|
|
-64.0 / 3.0, "%.1a",
|
||
|
|
{ "-0x1.6p+4", "-0x2.bp+3", "-0x5.6p+2", "-0xa.bp+1" },
|
||
|
|
{ "-0x1.5p+4", "-0x2.bp+3", "-0x5.5p+2", "-0xa.bp+1" },
|
||
|
|
{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" },
|
||
|
|
{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" }
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int
|
||
|
|
test_hex_in_one_mode (double d, const char *fmt, const char *const expected[4],
|
||
|
|
const char *mode_name)
|
||
|
|
{
|
||
|
|
char buf[100];
|
||
|
|
int ret = snprintf (buf, sizeof buf, fmt, d);
|
||
|
|
if (ret <= 0 || ret >= (int) sizeof buf)
|
||
|
|
{
|
||
|
|
printf ("snprintf for %a returned %d\n", d, ret);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (strcmp (buf, expected[0]) == 0
|
||
|
|
|| strcmp (buf, expected[1]) == 0
|
||
|
|
|| strcmp (buf, expected[2]) == 0
|
||
|
|
|| strcmp (buf, expected[3]) == 0)
|
||
|
|
return 0;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
printf ("snprintf (\"%s\", %a) returned \"%s\" not "
|
||
|
|
"\"%s\" or \"%s\" or \"%s\" or \"%s\" (%s)\n",
|
||
|
|
fmt, d, buf, expected[0], expected[1], expected[2], expected[3],
|
||
|
|
mode_name);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
do_test (void)
|
||
|
|
{
|
||
|
|
int save_round_mode __attribute__ ((unused)) = fegetround ();
|
||
|
|
int result = 0;
|
||
|
|
|
||
|
|
for (size_t i = 0; i < array_length (dec_tests); i++)
|
||
|
|
{
|
||
|
|
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
|
||
|
|
dec_tests[i].rn, "default rounding mode");
|
||
|
|
#ifdef FE_DOWNWARD
|
||
|
|
if (!fesetround (FE_DOWNWARD))
|
||
|
|
{
|
||
|
|
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
|
||
|
|
dec_tests[i].rd, "FE_DOWNWARD");
|
||
|
|
fesetround (save_round_mode);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#ifdef FE_TOWARDZERO
|
||
|
|
if (!fesetround (FE_TOWARDZERO))
|
||
|
|
{
|
||
|
|
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
|
||
|
|
dec_tests[i].rz, "FE_TOWARDZERO");
|
||
|
|
fesetround (save_round_mode);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#ifdef FE_UPWARD
|
||
|
|
if (!fesetround (FE_UPWARD))
|
||
|
|
{
|
||
|
|
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
|
||
|
|
dec_tests[i].ru, "FE_UPWARD");
|
||
|
|
fesetround (save_round_mode);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
for (size_t i = 0; i < array_length (hex_tests); i++)
|
||
|
|
{
|
||
|
|
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
|
||
|
|
hex_tests[i].rn, "default rounding mode");
|
||
|
|
#ifdef FE_DOWNWARD
|
||
|
|
if (!fesetround (FE_DOWNWARD))
|
||
|
|
{
|
||
|
|
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
|
||
|
|
hex_tests[i].rd, "FE_DOWNWARD");
|
||
|
|
fesetround (save_round_mode);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#ifdef FE_TOWARDZERO
|
||
|
|
if (!fesetround (FE_TOWARDZERO))
|
||
|
|
{
|
||
|
|
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
|
||
|
|
hex_tests[i].rz, "FE_TOWARDZERO");
|
||
|
|
fesetround (save_round_mode);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#ifdef FE_UPWARD
|
||
|
|
if (!fesetround (FE_UPWARD))
|
||
|
|
{
|
||
|
|
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
|
||
|
|
hex_tests[i].ru, "FE_UPWARD");
|
||
|
|
fesetround (save_round_mode);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define TEST_FUNCTION do_test ()
|
||
|
|
#include "../test-skeleton.c"
|