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glibc/math/basic-test.c
Thomas Schwinge f1cc4c8654 math: Additional type conversion tests 
These have helped me find and fix type conversion issues in QEMU's MIPS
hardware emulation.  While certainly glibc is not the best place for such
tests, they're just an enhancement of tests already present.
2013-08-29 12:21:07 +02:00

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/* Copyright (C) 1999-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999.
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/>. */
#include <math.h>
#include <float.h>
#include <stdio.h>
#include <math-tests.h>
static int errors = 0;
static void
check (const char *testname, int result)
{
if (!result) {
printf ("Failure: %s\n", testname);
errors++;
}
}
#define TEST_FUNC(NAME, FLOAT, SUFFIX, EPSILON, HUGEVAL) \
static void \
NAME (void) \
{ \
/* Variables are declared volatile to forbid some compiler \
optimizations. */ \
volatile FLOAT Inf_var, qNaN_var, zero_var, one_var; \
/* A sNaN is only guaranteed to be representable in variables with */ \
/* static (or thread-local) storage duration. */ \
static volatile FLOAT sNaN_var = __builtin_nans ## SUFFIX (""); \
static volatile FLOAT minus_sNaN_var = -__builtin_nans ## SUFFIX (""); \
FLOAT x1, x2; \
\
zero_var = 0.0; \
one_var = 1.0; \
qNaN_var = __builtin_nan ## SUFFIX (""); \
Inf_var = one_var / zero_var; \
\
(void) &zero_var; \
(void) &one_var; \
(void) &qNaN_var; \
(void) &sNaN_var; \
(void) &minus_sNaN_var; \
(void) &Inf_var; \
\
\
check (#FLOAT " isinf (inf) == 1", isinf (Inf_var) == 1); \
check (#FLOAT " isinf (-inf) == -1", isinf (-Inf_var) == -1); \
check (#FLOAT " !isinf (1)", !(isinf (one_var))); \
check (#FLOAT " !isinf (qNaN)", !(isinf (qNaN_var))); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " !isinf (sNaN)", !(isinf (sNaN_var))); \
\
check (#FLOAT " isnan (qNaN)", isnan (qNaN_var)); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " isnan (sNaN)", isnan (sNaN_var)); \
check (#FLOAT " isnan (-qNaN)", isnan (-qNaN_var)); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " isnan (-sNaN)", isnan (minus_sNaN_var)); \
check (#FLOAT " !isnan (1)", !(isnan (one_var))); \
check (#FLOAT " !isnan (inf)", !(isnan (Inf_var))); \
\
check (#FLOAT " !issignaling (qNaN)", !(issignaling (qNaN_var))); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " issignaling (sNaN)", issignaling (sNaN_var)); \
check (#FLOAT " !issignaling (-qNaN)", !(issignaling (-qNaN_var))); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " issignaling (-sNaN)", issignaling (minus_sNaN_var)); \
check (#FLOAT " !issignaling (1)", !(issignaling (one_var))); \
check (#FLOAT " !issignaling (inf)", !(issignaling (Inf_var))); \
\
check (#FLOAT " inf == inf", Inf_var == Inf_var); \
check (#FLOAT " -inf == -inf", -Inf_var == -Inf_var); \
check (#FLOAT " inf != -inf", Inf_var != -Inf_var); \
check (#FLOAT " qNaN != qNaN", qNaN_var != qNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " sNaN != sNaN", sNaN_var != sNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " qNaN != sNaN", qNaN_var != sNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " -sNaN != -sNaN", minus_sNaN_var != minus_sNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " sNaN != -sNaN", sNaN_var != minus_sNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " qNaN != -sNaN", qNaN_var != minus_sNaN_var); \
\
/* \
the same tests but this time with NAN from <bits/nan.h> \
NAN is a double const \
*/ \
check (#FLOAT " isnan (NAN)", isnan (NAN)); \
check (#FLOAT " isnan (-NAN)", isnan (-NAN)); \
check (#FLOAT " !isinf (NAN)", !(isinf (NAN))); \
check (#FLOAT " !isinf (-NAN)", !(isinf (-NAN))); \
check (#FLOAT " NAN != NAN", NAN != NAN); \
check (#FLOAT " NAN != qNaN", NAN != qNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " NAN != sNaN", NAN != sNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " NAN != -sNaN", NAN != minus_sNaN_var); \
\
/* \
And again with the value returned by the `nan' function. \
*/ \
check (#FLOAT " isnan (nan (\"\"))", isnan (nan ## SUFFIX (""))); \
check (#FLOAT " isnan (-nan (\"\"))", isnan (-nan ## SUFFIX (""))); \
check (#FLOAT " !isinf (nan (\"\"))", !(isinf (nan ## SUFFIX ("")))); \
check (#FLOAT " !isinf (-nan (\"\"))", !(isinf (-nan ## SUFFIX ("")))); \
check (#FLOAT " nan (\"\") != nan (\"\")", \
nan ## SUFFIX ("") != nan ## SUFFIX ("")); \
check (#FLOAT " nan (\"\") != qNaN", nan ## SUFFIX ("") != qNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " nan (\"\") != sNaN", nan ## SUFFIX ("") != sNaN_var); \
if (SNAN_TESTS (FLOAT)) \
check (#FLOAT " nan (\"\") != -sNaN", \
nan ## SUFFIX ("") != minus_sNaN_var); \
\
/* test if EPSILON is ok */ \
x1 = 1.0; \
x2 = x1 + EPSILON; \
check (#FLOAT " 1 != 1+EPSILON", x1 != x2); \
\
x1 = 1.0; \
x2 = x1 - EPSILON; \
check (#FLOAT " 1 != 1-EPSILON", x1 != x2); \
\
/* test if HUGE_VALx is ok */ \
x1 = HUGEVAL; \
check (#FLOAT " isinf (HUGE_VALx) == +1", isinf (x1) == +1); \
x1 = - HUGEVAL; \
check (#FLOAT " isinf (-HUGE_VALx) == -1", isinf (x1) == -1); \
}
#define TEST_CONVERT(NAME, FLOAT, DOUBLE, SUFFIX) \
void \
NAME (void) \
{ \
volatile DOUBLE Inf_var, qNaN_var, zero_var, one_var; \
/* A sNaN is only guaranteed to be representable in variables with */ \
/* static (or thread-local) storage duration. */ \
static volatile DOUBLE sNaN_var = __builtin_nans ## SUFFIX (""); \
FLOAT x1, x2; \
\
zero_var = 0.0; \
one_var = 1.0; \
qNaN_var = __builtin_nan ## SUFFIX (""); \
Inf_var = one_var / zero_var; \
\
(void) &qNaN_var; \
(void) &sNaN_var; \
(void) &Inf_var; \
\
x1 = (FLOAT) qNaN_var; \
check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") qNaN, isnan", isnan (x1)); \
check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") qNaN, !issignaling", \
!issignaling (x1)); \
if (SNAN_TESTS (FLOAT)) \
{ \
x1 = (FLOAT) sNaN_var; \
check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") sNaN, isnan", isnan (x1)); \
if (SNAN_TESTS_TYPE_CAST) \
{ \
/* Upon type conversion, a sNaN is converted into a qNaN plus an */ \
/* INVALID exception (not checked here). */ \
check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") sNaN, !issignaling", \
!issignaling (x1)); \
} \
} \
x2 = (FLOAT) Inf_var; \
check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") Inf", isinf (x2) != 0); \
}
TEST_FUNC (float_test, float, f, FLT_EPSILON, HUGE_VALF)
TEST_FUNC (double_test, double, , DBL_EPSILON, HUGE_VAL)
TEST_CONVERT (convert_dfsf_test, float, double, )
TEST_CONVERT (convert_sfdf_test, double, float, f)
#ifndef NO_LONG_DOUBLE
TEST_FUNC (ldouble_test, long double, l, LDBL_EPSILON, HUGE_VALL)
TEST_CONVERT (convert_tfsf_test, float, long double, l)
TEST_CONVERT (convert_sftf_test, long double, float, f)
TEST_CONVERT (convert_tfdf_test, double, long double, l)
TEST_CONVERT (convert_dftf_test, long double, double, )
#endif
int
do_test (void)
{
float_test ();
double_test ();
convert_dfsf_test();
convert_sfdf_test();
#ifndef NO_LONG_DOUBLE
ldouble_test ();
convert_tfsf_test();
convert_sftf_test();
convert_tfdf_test();
convert_dftf_test();
#endif
return errors != 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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