69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <fenv.h>
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#include <math.h>
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/*
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* We save and restore the floating-point environment to avoid raising
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* an inexact exception. We can get away with using fesetenv()
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* instead of feclearexcept()/feupdateenv() to restore the environment
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* because the only exception defined for rint() is overflow, and
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* rounding can't overflow as long as emax >= p.
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*
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* The volatile keyword is needed below because clang incorrectly assumes
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* that rint won't raise any floating-point exceptions. Declaring ret volatile
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* is sufficient to trick the compiler into doing the right thing.
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*/
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#define DECL(type, fn, rint) \
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type \
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fn(type x) \
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{ \
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volatile type ret; \
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fenv_t env; \
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\
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fegetenv(&env); \
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ret = rint(x); \
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fesetenv(&env); \
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return (ret); \
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}
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/*
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* nearbyint and nearbyintf are defined elsewhere in
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* newlib. Ignore the freebsd versions and only compile
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* nearbyintl.
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*/
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#if 0
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DECL(double, nearbyint, rint)
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DECL(float, nearbyintf, rintf)
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#endif
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DECL(long double, nearbyintl, rintl)
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