ipiq: Add simple IPI latency measure sysctls (2)
[dragonfly.git] / lib / libm / src / s_nearbyint.c
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1/*-
2 * Copyright (c) 2004 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.
1a3b704c 25 *
6ff43c94 26 * $FreeBSD: head/lib/msun/src/s_nearbyint.c 251024 2013-05-27 08:50:10Z das $
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27 */
28
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29#include <fenv.h>
30#include <math.h>
31
32/*
33 * We save and restore the floating-point environment to avoid raising
34 * an inexact exception. We can get away with using fesetenv()
35 * instead of feclearexcept()/feupdateenv() to restore the environment
36 * because the only exception defined for rint() is overflow, and
37 * rounding can't overflow as long as emax >= p.
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38 *
39 * The volatile keyword is needed below because clang incorrectly assumes
40 * that rint won't raise any floating-point exceptions. Declaring ret volatile
41 * is sufficient to trick the compiler into doing the right thing.
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42 */
43#define DECL(type, fn, rint) \
44type \
45fn(type x) \
46{ \
6ff43c94 47 volatile type ret; \
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48 fenv_t env; \
49 \
50 fegetenv(&env); \
51 ret = rint(x); \
52 fesetenv(&env); \
53 return (ret); \
54}
55
56DECL(double, nearbyint, rint)
57DECL(float, nearbyintf, rintf)
1a3b704c 58DECL(long double, nearbyintl, rintl)