1 /*-
2 * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27
28 #include <limits.h>
29 #ifndef dtype
30 #define dtype long
31 #define fn lrintl
32 #define DTYPE_MIN LONG_MIN
33 #define DTYPE_MAX LONG_MAX
34 #endif
35
36 /*
37 * C99 says we should not raise a spurious inexact exception when an
38 * invalid exception is raised. Unfortunately, the set of inputs
39 * that overflows depends on the rounding mode when 'long' has more
40 * significant bits than 'long double'. Hence, we bend over backwards for the
41 * sake of correctness; an MD implementation could be more efficient.
42 */
43 dtype
fn(long double x)44 fn(long double x)
45 {
46 dtype d;
47
48 if (!__finitel(x))
49 __math_set_invalidl();
50 #ifdef FE_INVALID
51 fenv_t env;
52 feholdexcept(&env);
53 #endif
54 x = rintl(x);
55 d = (dtype) x;
56 #ifdef FE_INVALID
57 if (fetestexcept(FE_INVALID))
58 feclearexcept(FE_INVALID);
59 feupdateenv(&env);
60 #endif
61 if ((long double) d != x) {
62 __math_set_invalidl();
63 return x > 0 ? DTYPE_MAX : DTYPE_MIN;
64 }
65 return (d);
66 }
67
