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Diffstat (limited to 'lib/libm/t_round.c')
| -rw-r--r-- | lib/libm/t_round.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/libm/t_round.c b/lib/libm/t_round.c new file mode 100644 index 000000000000..f47e1a0f8a13 --- /dev/null +++ b/lib/libm/t_round.c @@ -0,0 +1,85 @@ +/* $NetBSD: t_round.c,v 1.4 2013/11/11 23:57:34 joerg 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 <atf-c.h> +#include <float.h> +#include <math.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_TP_ADD_TCS(tp) +{ + + ATF_TP_ADD_TC(tp, round_dir); + + return atf_no_error(); +} |