ext/fputils/tests/fp80_cvtd.c

/*
 * Copyright (c) 2013 Andreas Sandberg
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Andreas Sandberg
 */

#include <fputils/fp80.h>

#include "test_helper.h"

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

/* We provide our own version of isinf_sgn since the C99 standard
 * doesn't guarantee that isinf() returns the sign of the infinity
 * (most implementations do). */
static inline int
isinf_sgn(double x)
{
    return isinf(x) ? (signbit(x) ? -1 : 1) : 0;
}

static void
test_fp80_cvtd_class(const char *name, fp80_t fin, int class)
{
    double d = fp80_cvtd(fin);
    if (fpclassify(d) != class) {
        test_diag("wrong class");
        test_fail(name);
    } else {
        test_ok(name);
    }
}

static void
test_fp80_cvtd_inf(const char *name, fp80_t fin, int expected_inf_class)
{
    double d = fp80_cvtd(fin);
    if (isinf_sgn(d) != expected_inf_class) {
        test_diag("wrong infinity type");
        test_fail(name);
    } else {
        test_ok(name);
    }
}

int
main(int argc, char *argv[])
{
    test_init(6);

    test_fp80_cvtd_inf("fp80->double +inf", fp80_pinf, 1);
    test_fp80_cvtd_inf("fp80->double -inf", fp80_ninf, -1);
    test_fp80_cvtd_class("fp80->double qnan", fp80_qnan, FP_NAN);
    test_fp80_cvtd_class("fp80->double qnani", fp80_qnani, FP_NAN);
    test_fp80_cvtd_class("fp80->double snan", fp80_snan, FP_NAN);
    test_fp80_cvtd_class("fp80->double nan", fp80_nan, FP_NAN);

    test_exit();
}