58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2013 David Chisnall
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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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* $FreeBSD$
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*/
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#include <float.h>
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#include <math.h>
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/*
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* If long double is not the same size as double, then these will lose
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* precision and we should emit a warning whenever something links against
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* them.
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*/
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#if (LDBL_MANT_DIG > 53)
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#define WARN_IMPRECISE(x) \
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__warn_references(x, # x " has lower than advertised precision");
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#else
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#define WARN_IMPRECISE(x)
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#endif
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/*
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* Declare the functions as weak variants so that other libraries providing
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* real versions can override them.
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*/
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#define DECLARE_WEAK(x)\
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__weak_reference(imprecise_## x, x);\
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WARN_IMPRECISE(x)
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#define DECLARE_IMPRECISE(f) \
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long double imprecise_ ## f ## l(long double v) { return f(v); }\
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DECLARE_WEAK(f ## l)
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DECLARE_IMPRECISE(tgamma);
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