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/* $NetBSD: t_round.c,v 1.9 2017/09/03 13:41:19 wiz Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* 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/param.h>
#include <atf-c.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
/*
* This tests for a bug in the initial implementation where
* precision was lost in an internal substraction, leading to
* rounding into the wrong direction.
*/
/* 0.5 - EPSILON */
#define VAL 0x0.7ffffffffffffcp0
#define VALF 0x0.7fffff8p0
#define VALL (0.5 - LDBL_EPSILON)
#ifdef __vax__
#define SMALL_NUM 1.0e-38
#else
#define SMALL_NUM 1.0e-40
#endif
ATF_TC(round_dir);
ATF_TC_HEAD(round_dir, tc)
{
atf_tc_set_md_var(tc, "descr","Check for rounding in wrong direction");
}
ATF_TC_BODY(round_dir, tc)
{
double a = VAL, b, c;
float af = VALF, bf, cf;
long double al = VALL, bl, cl;
b = round(a);
bf = roundf(af);
bl = roundl(al);
ATF_CHECK(fabs(b) < SMALL_NUM);
ATF_CHECK(fabsf(bf) < SMALL_NUM);
ATF_CHECK(fabsl(bl) < SMALL_NUM);
c = round(-a);
cf = roundf(-af);
cl = roundl(-al);
ATF_CHECK(fabs(c) < SMALL_NUM);
ATF_CHECK(fabsf(cf) < SMALL_NUM);
ATF_CHECK(fabsl(cl) < SMALL_NUM);
}
ATF_TC(rounding_alpha);
ATF_TC_HEAD(rounding_alpha, tc)
{
atf_tc_set_md_var(tc, "descr","Checking MPFR's config failure with -mieee on Alpha");
}
typedef uint64_t gimpy_limb_t;
#define GIMPY_NUMB_BITS 64
ATF_TC_BODY(rounding_alpha, tc)
{
double d;
gimpy_limb_t u;
int i;
d = 1.0;
for (i = 0; i < GIMPY_NUMB_BITS - 1; i++)
d = d + d;
printf("d = %g\n", d);
u = (gimpy_limb_t) d;
for (; i > 0; i--) {
ATF_CHECK_MSG((u % 2 == 0),
"%"PRIu64" is not an even number! (iteration %d)", u , i);
u = u >> 1;
}
}
ATF_TC(rounding_alpha_simple);
ATF_TC_HEAD(rounding_alpha_simple, tc)
{
atf_tc_set_md_var(tc, "descr","Checking double to uint64_t edge case");
}
double rounding_alpha_simple_even = 9223372036854775808.000000; /* 2^63 */
ATF_TC_BODY(rounding_alpha_simple, tc)
{
uint64_t unsigned_even = rounding_alpha_simple_even;
ATF_CHECK_MSG(unsigned_even % 2 == 0,
"2^63 cast to uint64_t is odd (got %"PRIu64")", unsigned_even);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, round_dir);
ATF_TP_ADD_TC(tp, rounding_alpha);
ATF_TP_ADD_TC(tp, rounding_alpha_simple);
return atf_no_error();
}
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