1 /* Test of rounding to nearest, breaking ties away from zero.
2 Copyright (C) 2007-2009 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Ben Pfaff <blp@gnu.org>, 2007.
19 Based heavily on Bruno Haible's test-truncl.c. */
30 #include "isnanl-nolibm.h"
33 #define ASSERT(expr) \
38 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
45 /* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
46 So we use minus_zero instead.
47 IRIX cc can't put -0.0L into .data, but can compute at runtime.
48 Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
49 platforms, such as when cross-compiling to PowerPC on MacOS X 10.5. */
50 #if defined __hpux || defined __sgi
52 compute_minus_zero (void)
54 return -LDBL_MIN * LDBL_MIN;
56 # define minus_zero compute_minus_zero ()
58 long double minus_zero = -0.0L;
64 DECL_LONG_DOUBLE_ROUNDING
66 BEGIN_LONG_DOUBLE_ROUNDING ();
69 ASSERT (roundl (0.0L) == 0.0L);
70 ASSERT (roundl (minus_zero) == 0.0L);
71 /* Positive numbers. */
72 ASSERT (roundl (0.3L) == 0.0L);
73 ASSERT (roundl (0.5L) == 1.0L);
74 ASSERT (roundl (0.7L) == 1.0L);
75 ASSERT (roundl (1.0L) == 1.0L);
76 ASSERT (roundl (1.5L) == 2.0L);
77 ASSERT (roundl (2.5L) == 3.0L);
78 ASSERT (roundl (1.999L) == 2.0L);
79 ASSERT (roundl (2.0L) == 2.0L);
80 ASSERT (roundl (65535.999L) == 65536.0L);
81 ASSERT (roundl (65536.0L) == 65536.0L);
82 ASSERT (roundl (65536.001L) == 65536.0L);
83 ASSERT (roundl (2.341e31L) == 2.341e31L);
84 /* Negative numbers. */
85 ASSERT (roundl (-0.3L) == 0.0L);
86 ASSERT (roundl (-0.5L) == -1.0L);
87 ASSERT (roundl (-0.7L) == -1.0L);
88 ASSERT (roundl (-1.0L) == -1.0L);
89 ASSERT (roundl (-1.5L) == -2.0L);
90 ASSERT (roundl (-2.5L) == -3.0L);
91 ASSERT (roundl (-1.999L) == -2.0L);
92 ASSERT (roundl (-2.0L) == -2.0L);
93 ASSERT (roundl (-65535.999L) == -65536.0L);
94 ASSERT (roundl (-65536.0L) == -65536.0L);
95 ASSERT (roundl (-65536.001L) == -65536.0L);
96 ASSERT (roundl (-2.341e31L) == -2.341e31L);
97 /* Infinite numbers. */
98 ASSERT (roundl (1.0 / 0.0L) == 1.0 / 0.0L);
99 ASSERT (roundl (-1.0 / 0.0L) == -1.0 / 0.0L);
101 ASSERT (isnanl (roundl (NaNl ())));