diff options
Diffstat (limited to 'contrib/netbsd-tests/lib/libm/t_round.c')
| -rw-r--r-- | contrib/netbsd-tests/lib/libm/t_round.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/contrib/netbsd-tests/lib/libm/t_round.c b/contrib/netbsd-tests/lib/libm/t_round.c new file mode 100644 index 000000000000..bafc894943ce --- /dev/null +++ b/contrib/netbsd-tests/lib/libm/t_round.c @@ -0,0 +1,138 @@ +/* $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"); +} + + +static 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(); +} |