xref: /src/tests/lib/libm/t_ldexp.c

/* $NetBSD: t_ldexp.c,v 1.8 2011/09/16 04:54:46 jruoho Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jukka Ruohonen.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_ldexp.c,v 1.8 2011/09/16 04:54:46 jruoho Exp $");

#include <math.h>
#include <limits.h>

#include <atf-c.h>

static const int exps[] = { 0, 1, -1, 100, -100 };

/*
 * ldexp(3)
 */
ATF_TC(ldexp_exp2);
ATF_TC_HEAD(ldexp_exp2, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexp(x, n) == x * exp2(n)");
}

ATF_TC_BODY(ldexp_exp2, tc)
{
#ifndef __vax__
	const double n[] = { 1, 2, 3, 25, 50, 100, 123, 321, 500 };
	const double eps = 1.0e-40;
	const double x = 12.0;
	double y;
	size_t i;

	for (i = 0; i < __arraycount(n); i++) {

		y = ldexp(x, n[i]);

		if (fabs(y - (x * exp2(n[i]))) > eps) {
			atf_tc_fail_nonfatal("ldexp(%0.01f, %0.01f) "
			    "!= %0.01f * exp2(%0.01f)", x, n[i], x, n[i]);
		}
	}
#endif
}

ATF_TC(ldexp_nan);
ATF_TC_HEAD(ldexp_nan, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexp(NaN) == NaN");
}

ATF_TC_BODY(ldexp_nan, tc)
{
#ifndef __vax__
	const double x = 0.0L / 0.0L;
	double y;
	size_t i;

	ATF_REQUIRE(isnan(x) != 0);

	for (i = 0; i < __arraycount(exps); i++) {
		y = ldexp(x, exps[i]);
		ATF_CHECK(isnan(y) != 0);
	}
#endif
}

ATF_TC(ldexp_inf_neg);
ATF_TC_HEAD(ldexp_inf_neg, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexp(-Inf) == -Inf");
}

ATF_TC_BODY(ldexp_inf_neg, tc)
{
#ifndef __vax__
	const double x = -1.0L / 0.0L;
	size_t i;

	for (i = 0; i < __arraycount(exps); i++)
		ATF_CHECK(ldexp(x, exps[i]) == x);
#endif
}

ATF_TC(ldexp_inf_pos);
ATF_TC_HEAD(ldexp_inf_pos, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexp(+Inf) == +Inf");
}

ATF_TC_BODY(ldexp_inf_pos, tc)
{
#ifndef __vax__
	const double x = 1.0L / 0.0L;
	size_t i;

	for (i = 0; i < __arraycount(exps); i++)
		ATF_CHECK(ldexp(x, exps[i]) == x);
#endif
}

ATF_TC(ldexp_zero_neg);
ATF_TC_HEAD(ldexp_zero_neg, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexp(-0.0) == -0.0");
}

ATF_TC_BODY(ldexp_zero_neg, tc)
{
#ifndef __vax__
	const double x = -0.0L;
	double y;
	size_t i;

	ATF_REQUIRE(signbit(x) != 0);

	for (i = 0; i < __arraycount(exps); i++) {
		y = ldexp(x, exps[i]);
		ATF_CHECK(x == y);
		ATF_CHECK(signbit(y) != 0);
	}
#endif
}

ATF_TC(ldexp_zero_pos);
ATF_TC_HEAD(ldexp_zero_pos, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexp(+0.0) == +0.0");
}

ATF_TC_BODY(ldexp_zero_pos, tc)
{
#ifndef __vax__
	const double x = 0.0L;
	double y;
	size_t i;

	ATF_REQUIRE(signbit(x) == 0);

	for (i = 0; i < __arraycount(exps); i++) {
		y = ldexp(x, exps[i]);
		ATF_CHECK(x == y);
		ATF_CHECK(signbit(y) == 0);
	}
#endif
}

/*
 * ldexpf(3)
 */

ATF_TC(ldexpf_exp2f);
ATF_TC_HEAD(ldexpf_exp2f, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexpf(x, n) == x * exp2f(n)");
}

ATF_TC_BODY(ldexpf_exp2f, tc)
{
#ifndef __vax__
	const float n[] = { 1, 2, 3, 25, 50, 100, 123, 321, 500 };
	const float eps = 1.0e-9;
	const float x = 12;
	float y;
	size_t i;

	for (i = 0; i < __arraycount(n); i++) {

		y = ldexpf(x, n[i]);

		if (fabsf(y - (x * exp2f(n[i]))) > eps) {
			atf_tc_fail_nonfatal("ldexpf(%0.01f, %0.01f) "
			    "!= %0.01f * exp2f(%0.01f)", x, n[i], x, n[i]);
		}
	}
#endif
}

ATF_TC(ldexpf_nan);
ATF_TC_HEAD(ldexpf_nan, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexpf(NaN) == NaN");
}

ATF_TC_BODY(ldexpf_nan, tc)
{
#ifndef __vax__
	const float x = 0.0L / 0.0L;
	float y;
	size_t i;

	ATF_REQUIRE(isnan(x) != 0);

	for (i = 0; i < __arraycount(exps); i++) {
		y = ldexpf(x, exps[i]);
		ATF_CHECK(isnan(y) != 0);
	}
#endif
}

ATF_TC(ldexpf_inf_neg);
ATF_TC_HEAD(ldexpf_inf_neg, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexpf(-Inf) == -Inf");
}

ATF_TC_BODY(ldexpf_inf_neg, tc)
{
#ifndef __vax__
	const float x = -1.0L / 0.0L;
	size_t i;

	for (i = 0; i < __arraycount(exps); i++)
		ATF_CHECK(ldexpf(x, exps[i]) == x);
#endif
}

ATF_TC(ldexpf_inf_pos);
ATF_TC_HEAD(ldexpf_inf_pos, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexpf(+Inf) == +Inf");
}

ATF_TC_BODY(ldexpf_inf_pos, tc)
{
#ifndef __vax__
	const float x = 1.0L / 0.0L;
	size_t i;

	for (i = 0; i < __arraycount(exps); i++)
		ATF_CHECK(ldexpf(x, exps[i]) == x);
#endif
}

ATF_TC(ldexpf_zero_neg);
ATF_TC_HEAD(ldexpf_zero_neg, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexpf(-0.0) == -0.0");
}

ATF_TC_BODY(ldexpf_zero_neg, tc)
{
#ifndef __vax__
	const float x = -0.0L;
	float y;
	size_t i;

	ATF_REQUIRE(signbit(x) != 0);

	for (i = 0; i < __arraycount(exps); i++) {
		y = ldexpf(x, exps[i]);
		ATF_CHECK(x == y);
		ATF_CHECK(signbit(y) != 0);
	}
#endif
}

ATF_TC(ldexpf_zero_pos);
ATF_TC_HEAD(ldexpf_zero_pos, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test ldexpf(+0.0) == +0.0");
}

ATF_TC_BODY(ldexpf_zero_pos, tc)
{
#ifndef __vax__
	const float x = 0.0L;
	float y;
	size_t i;

	ATF_REQUIRE(signbit(x) == 0);

	for (i = 0; i < __arraycount(exps); i++) {
		y = ldexpf(x, exps[i]);
		ATF_CHECK(x == y);
		ATF_CHECK(signbit(y) == 0);
	}
#endif
}

ATF_TP_ADD_TCS(tp)
{

	ATF_TP_ADD_TC(tp, ldexp_exp2);
	ATF_TP_ADD_TC(tp, ldexp_nan);
	ATF_TP_ADD_TC(tp, ldexp_inf_neg);
	ATF_TP_ADD_TC(tp, ldexp_inf_pos);
	ATF_TP_ADD_TC(tp, ldexp_zero_neg);
	ATF_TP_ADD_TC(tp, ldexp_zero_pos);

	ATF_TP_ADD_TC(tp, ldexpf_exp2f);
	ATF_TP_ADD_TC(tp, ldexpf_nan);
	ATF_TP_ADD_TC(tp, ldexpf_inf_neg);
	ATF_TP_ADD_TC(tp, ldexpf_inf_pos);
	ATF_TP_ADD_TC(tp, ldexpf_zero_neg);
	ATF_TP_ADD_TC(tp, ldexpf_zero_pos);

	return atf_no_error();
}