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glibc/stdlib/tst-strtod-round-skeleton.c
Joseph Myers d73ed2601b More thoroughly test underflow / errno in tst-strtod-round 
Add tests of underflow in tst-strtod-round, and thus also test for
errno being unchanged when there is neither overflow nor underflow.
The errno setting before the function call to test for being unchanged
is adjusted to set errno to 12345 instead of 0, so that any bugs where
strtod sets errno to 0 would be detected.

This doesn't add any new test inputs for tst-strtod-round, and in
particular doesn't cover the edge cases of underflow the way
tst-strtod-underflow does (none of the existing test inputs for
tst-strtod-round actually exercise cases that have underflow with
before-rounding tininess detection but not with after-rounding
tininess detection), but at least it provides some coverage (as per
the recent discussions) that ordinary non-overflowing non-underflowing
inputs to these functions do not set errno.

Tested for x86_64.
2024-08-27 12:38:01 +00:00

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/* Test for correct rounding of results of strtod and related
functions.
Copyright (C) 2012-2024 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/>. */
/* Defining _LIBC_TEST ensures long double math functions are
declared in the headers. */
#define _LIBC_TEST 1
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <errno.h>
#include <fenv.h>
#include <float.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math-tests.h>
#include <tininess.h>
#include "tst-strtod.h"
/* Non-standard macros expected to be externally defined:
L_(str): Pastes the appropriate modifier to a string literal str.
FNPFX: Expands to the correct prefix for the strtod equivalent
of type CHAR. (e.g str or wcs).
CHAR: Expands to the string type being tested (e.g wchar_t or char).
STRM: Expands to a string literal suitable for printing CHAR* via
printf (e.g "%s" or "%ls"). */
#define _CONCAT(a, b) a ## b
#define CONCAT(a, b) _CONCAT (a, b)
#define STRTO(x) CONCAT (CONCAT (FNPFX, to), x)
#if LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
/* This is a stupid hack for IBM long double. This test ignores
inexact values for long double due to the limitations of the
format. This ensures rounding tests are ignored. */
# undef ROUNDING_TESTS_long_double
# define ROUNDING_TESTS_long_double(x) 0
#endif
/* Generator to create an FTYPE member variabled named FSUF
used to populate struct member variables. */
#define FTYPE_MEMBER(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
FTYPE FSUF;
/* Likewise, but each member is of type bool. */
#define BOOL_MEMBER(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
bool FSUF;
#define STRUCT_FOREACH_FLOAT_FTYPE GEN_TEST_STRTOD_FOREACH (FTYPE_MEMBER)
#define STRUCT_FOREACH_FLOAT_BOOL GEN_TEST_STRTOD_FOREACH (BOOL_MEMBER)
/* Define the long double choose (CHOOSE_ld) macro
to select the appropriate generated long double
value from the generated test data. */
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
/* This is for the long double == double format. */
# define CHOOSE_ld(f,d,...) d
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16381
/* This is for the Intel extended float format. */
# define CHOOSE_ld(f,d,ld64i,...) ld64i
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16382
/* This is for the Motorola extended float format. */
# define CHOOSE_ld(f,d,ld64i,ld64m,...) ld64m
#elif LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
/* This is for the IBM extended double format. */
# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,...) ld106
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
/* This is for the IEEE binary128 format. */
# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,ld113,...) ld113
#else
# error "unknown long double format"
#endif
/* Add type specific choosing macros below. */
#define CHOOSE_f(f,...) f
#define CHOOSE_f32(f,...) f
#define CHOOSE_d(f,d,...) d
#define CHOOSE_f64(f,d,...) d
#define CHOOSE_f32x(f,d,...) d
#define CHOOSE_f128(f,d,ld64i,ld64m,ld106,ld113,...) ld113
/* long double is special, and handled above. _Float16 would require
updates to the generator to generate appropriate expectations, and
updates to the test inputs to cover difficult rounding cases for
_Float16. */
#if __HAVE_FLOAT64X
# if FLT64X_MANT_DIG == 113 && FLT64X_MAX_EXP == 16384
# define CHOOSE_f64x(f,d,ld64i,ld64m,ld106,ld113,...) ld113
# elif (FLT64X_MANT_DIG == 64 \
&& FLT64X_MAX_EXP == 16384 \
&& FLT64X_MIN_EXP == -16381)
# define CHOOSE_f64x(f,d,ld64i,...) ld64i
# else
# error "unknown _Float64x format"
# endif
#endif
/* Selector for expected result field of a given type. */
#define _ENTRY(FSUF, FTYPE, FTOSTR, LSUF, CSUF, ...) \
CONCAT (CHOOSE_ ## FSUF (__VA_ARGS__), LSUF),
#define ENTRY(...) \
GEN_TEST_STRTOD_FOREACH (_ENTRY, __VA_ARGS__)
/* Selector for boolean exact tag of expected results and that for
overflow. */
#define _XNTRY(FSUF, FTYPE, FTOSTR, LSUF, CSUF, ...) \
CHOOSE_ ## FSUF (__VA_ARGS__),
#define XNTRY(...) \
GEN_TEST_STRTOD_FOREACH (_XNTRY, __VA_ARGS__)
/* This is hacky way around the seemingly unavoidable macro
expansion of the INFINITY or HUGE_VAL like macros in the
above. It is assumed the compiler will implicitly convert
the infinity correctly. */
#define INF INFINITY + 0.0
/* This macro is used in conjunction with the output from the
gen-tst-strtod-round utility to select the appropriately
rounded long double value for a given format. */
#define TEST(s, \
fx, fd, fdo, fdu, fn, fno, fnu, \
fz, fzo, fzu, fu, fuo, fuu, \
dx, dd, ddo, ddu, dn, dno, dnu, \
dz, dzo, dzu, du, duo, duu, \
ld64ix, ld64id, ld64ido, ld64idu, \
ld64in, ld64ino, ld64inu, \
ld64iz, ld64izo, ld64izu, \
ld64iu, ld64iuo, ld64iuu, \
ld64mx, ld64md, ld64mdo, ld64mdu, \
ld64mn, ld64mno, ld64mnu, \
ld64mz, ld64mzo, ld64mzu, \
ld64mu, ld64muo, ld64muu, \
ld106x, ld106d, ld106do, ld106du, \
ld106n, ld106no, ld106nu, \
ld106z, ld106zo, ld106zu, \
ld106u, ld106uo, ld106uu, \
ld113x, ld113d, ld113do, ld113du, \
ld113n, ld113no, ld113nu, \
ld113z, ld113zo, ld113zu, \
ld113u, ld113uo, ld113uu) \
{ \
L_ (s), \
{ XNTRY (fx, dx, ld64ix, ld64mx, ld106x, ld113x) }, \
{ \
{ ENTRY (fn, dn, ld64in, ld64mn, ld106n, ld113n) }, \
{ ENTRY (fd, dd, ld64id, ld64md, ld106d, ld113d) }, \
{ ENTRY (fz, dz, ld64iz, ld64mz, ld106z, ld113z) }, \
{ ENTRY (fu, du, ld64iu, ld64mu, ld106u, ld113u) } \
}, \
{ \
{ XNTRY (fno, dno, ld64ino, ld64mno, ld106no, ld113no) }, \
{ XNTRY (fdo, ddo, ld64ido, ld64mdo, ld106do, ld113do) }, \
{ XNTRY (fzo, dzo, ld64izo, ld64mzo, ld106zo, ld113zo) }, \
{ XNTRY (fuo, duo, ld64iuo, ld64muo, ld106uo, ld113uo) } \
}, \
{ \
{ XNTRY (fnu, dnu, ld64inu, ld64mnu, ld106nu, ld113nu) }, \
{ XNTRY (fdu, ddu, ld64idu, ld64mdu, ld106du, ld113du) }, \
{ XNTRY (fzu, dzu, ld64izu, ld64mzu, ld106zu, ld113zu) }, \
{ XNTRY (fuu, duu, ld64iuu, ld64muu, ld106uu, ld113uu) } \
} \
}
struct test_exactness
{
STRUCT_FOREACH_FLOAT_BOOL
};
struct test_results
{
STRUCT_FOREACH_FLOAT_FTYPE
};
struct test_overflow
{
STRUCT_FOREACH_FLOAT_BOOL
};
struct test_underflow
{
STRUCT_FOREACH_FLOAT_BOOL
};
struct test {
const CHAR *s;
struct test_exactness exact;
struct test_results r[4];
struct test_overflow o[4];
struct test_underflow u[4];
};
/* Include the generated test data. */
#include "tst-strtod-round-data.h"
#define STRX(x) #x
#define STR(x) STRX (x)
#define FNPFXS STR (FNPFX)
#ifndef FE_INEXACT
# define FE_INEXACT 0
#endif
#ifndef FE_OVERFLOW
# define FE_OVERFLOW 0
#endif
#ifndef FE_UNDERFLOW
# define FE_UNDERFLOW 0
#endif
#define GEN_ONE_TEST(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
{ \
feclearexcept (FE_ALL_EXCEPT); \
errno = 12345; \
FTYPE f = STRTO (FSUF) (s, NULL); \
int new_errno = errno; \
if (f != expected->FSUF \
|| (copysign ## CSUF) (1.0 ## LSUF, f) \
!= (copysign ## CSUF) (1.0 ## LSUF, expected->FSUF)) \
{ \
char efstr[FSTRLENMAX]; \
char fstr[FSTRLENMAX]; \
FTOSTR (efstr, FSTRLENMAX, "%a", expected->FSUF); \
FTOSTR (fstr, FSTRLENMAX, "%a", f); \
printf (FNPFXS "to" #FSUF " (" STRM ") returned %s not " \
"%s (%s)\n", s, fstr, efstr, mode_name); \
if (ROUNDING_TESTS (FTYPE, rnd_mode) || exact->FSUF) \
result = 1; \
else \
printf ("ignoring this inexact result\n"); \
} \
else \
{ \
if (FE_INEXACT != 0) \
{ \
bool inexact_raised = fetestexcept (FE_INEXACT) != 0; \
if (inexact_raised != !exact->FSUF) \
{ \
printf (FNPFXS "to" #FSUF \
" (" STRM ") inexact %d " \
"not %d\n", s, inexact_raised, \
!exact->FSUF); \
if (EXCEPTION_TESTS (FTYPE)) \
result = 1; \
else \
printf ("ignoring this exception error\n"); \
} \
} \
if (FE_OVERFLOW != 0) \
{ \
bool overflow_raised \
= fetestexcept (FE_OVERFLOW) != 0; \
if (overflow_raised != overflow->FSUF) \
{ \
printf (FNPFXS "to" #FSUF \
" (" STRM ") overflow %d " \
"not %d\n", s, overflow_raised, \
overflow->FSUF); \
if (EXCEPTION_TESTS (FTYPE)) \
result = 1; \
else \
printf ("ignoring this exception error\n"); \
} \
} \
if (overflow->FSUF && new_errno != ERANGE) \
{ \
printf (FNPFXS "to" #FSUF \
" (" STRM ") left errno == %d," \
" not %d (ERANGE)\n", \
s, new_errno, ERANGE); \
result = 1; \
} \
if (FE_UNDERFLOW != 0) \
{ \
bool underflow_raised \
= fetestexcept (FE_UNDERFLOW) != 0; \
if (underflow_raised != underflow->FSUF) \
{ \
printf (FNPFXS "to" #FSUF \
" (" STRM ") underflow %d " \
"not %d\n", s, underflow_raised, \
underflow->FSUF); \
if (EXCEPTION_TESTS (FTYPE)) \
result = 1; \
else \
printf ("ignoring this exception error\n"); \
} \
} \
if (underflow->FSUF && new_errno != ERANGE) \
{ \
printf (FNPFXS "to" #FSUF \
" (" STRM ") left errno == %d," \
" not %d (ERANGE)\n", \
s, new_errno, ERANGE); \
result = 1; \
} \
if (!overflow->FSUF \
&& !underflow->FSUF \
&& new_errno != 12345) \
{ \
printf (FNPFXS "to" #FSUF \
" (" STRM ") set errno == %d," \
" should be unchanged\n", \
s, new_errno); \
result = 1; \
} \
} \
}
static int
test_in_one_mode (const CHAR *s, const struct test_results *expected,
const struct test_exactness *exact,
const struct test_overflow *overflow,
const struct test_underflow *underflow,
const char *mode_name, int rnd_mode)
{
int result = 0;
GEN_TEST_STRTOD_FOREACH (GEN_ONE_TEST)
return result;
}
static const struct fetestmodes
{
const char *mode_name;
int rnd_mode;
int rnd_i; /* Corresponding index into r array of struct test. */
} modes[] = {
{ "default rounding mode", FE_TONEAREST, 0 },
#ifdef FE_DOWNWARD
{ "FE_DOWNWARD", FE_DOWNWARD, 1 },
#endif
#ifdef FE_TOWARDZERO
{ "FE_TOWARDZERO", FE_TOWARDZERO, 2 },
#endif
#ifdef FE_UPWARD
{ "FE_UPWARD", FE_UPWARD, 3 },
#endif
{}
};
static int
do_test (void)
{
int save_round_mode __attribute__ ((unused)) = fegetround ();
int result = 0;
for (size_t i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
{
result |= test_in_one_mode (tests[i].s, &tests[i].r[modes[0].rnd_i],
&tests[i].exact, &tests[i].o[modes[0].rnd_i],
&tests[i].u[modes[0].rnd_i],
modes[0].mode_name, modes[0].rnd_mode);
for (const struct fetestmodes *m = &modes[1]; m->mode_name != NULL; m++)
{
if (!fesetround (m->rnd_mode))
{
result |= test_in_one_mode (tests[i].s, &tests[i].r[m->rnd_i],
&tests[i].exact,
&tests[i].o[m->rnd_i],
&tests[i].u[m->rnd_i],
m->mode_name,
m->rnd_mode);
fesetround (save_round_mode);
}
}
}
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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