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 #include "namespace.h"
28
29 #include <sys/cdefs.h>
30 #include <fenv.h>
31 #include <math.h>
32
33 #ifndef stype
34 #ifdef __FreeBSD__
35 __FBSDID("$FreeBSD: head/lib/msun/src/s_lrint.c 140088 2005-01-11 23:12:55Z das $");
36 #else
37 __RCSID("$NetBSD: s_lrint.c,v 1.1 2017/05/06 18:03:24 christos Exp $");
38 #endif
39 #define stype double
40 #define roundit rint
41 #define dtype long
42 #define fn lrint
43 #endif
44
45 /*
46 * C99 says we should not raise a spurious inexact exception when an
47 * invalid exception is raised. Unfortunately, the set of inputs
48 * that overflows depends on the rounding mode when 'dtype' has more
49 * significant bits than 'stype'. Hence, we bend over backwards for the
50 * sake of correctness; an MD implementation could be more efficient.
51 */
52 dtype
fn(stype x)53 fn(stype x)
54 {
55 fenv_t env;
56 dtype d;
57
58 feholdexcept(&env);
59 d = (dtype)roundit(x);
60 if (fetestexcept(FE_INVALID))
61 feclearexcept(FE_INEXACT);
62 feupdateenv(&env);
63 return (d);
64 }
65