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/* $OpenBSD: s_lrintl.c,v 1.2 2012/12/05 23:20:04 deraadt Exp $ */ |
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/*- |
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* Copyright (c) 2005 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 <fenv.h> |
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#include <math.h> |
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#ifndef type |
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#if 0 |
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__FBSDID("$FreeBSD: src/lib/msun/src/s_lrint.c,v 1.1 2005/01/11 23:12:55 das Exp $"); |
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#endif |
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#define type long double |
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#define roundit rintl |
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#define dtype long |
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#define fn lrintl |
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#endif |
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/* |
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* C99 says we should not raise a spurious inexact exception when an |
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* invalid exception is raised. Unfortunately, the set of inputs |
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* that overflows depends on the rounding mode when 'dtype' has more |
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* significant bits than 'type'. Hence, we bend over backwards for the |
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* sake of correctness; an MD implementation could be more efficient. |
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*/ |
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dtype |
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fn(type x) |
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{ |
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fenv_t env; |
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dtype d; |
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feholdexcept(&env); |
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d = (dtype)roundit(x); |
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if (fetestexcept(FE_INVALID)) |
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feclearexcept(FE_INEXACT); |
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feupdateenv(&env); |
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return (d); |
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} |