GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_frexpl.c Lines: 5 12 41.7 %
Date: 2017-11-13 Branches: 2 5 40.0 %

Line Branch Exec Source
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/*	$OpenBSD: s_frexpl.c,v 1.2 2016/09/12 19:47:02 guenther Exp $	*/
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/*-
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 * Copyright (c) 2004-2005 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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 * $FreeBSD: src/lib/msun/src/s_frexpl.c,v 1.1 2005/03/07 04:54:51 das Exp $
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 */
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#include <sys/types.h>
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#include <machine/ieee.h>
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#include <float.h>
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#include <math.h>
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#if LDBL_MAX_EXP != 0x4000
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#error "Unsupported long double format"
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#endif
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long double
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frexpl(long double x, int *ex)
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{
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	struct ieee_ext *p = (struct ieee_ext *)&x;
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	switch (p->ext_exp) {
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	case 0:		/* 0 or subnormal */
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		if ((p->ext_fracl
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#ifdef EXT_FRACLMBITS
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			| p->ext_fraclm
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#endif /* EXT_FRACLMBITS */
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#ifdef EXT_FRACHMBITS
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			| p->ext_frachm
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#endif /* EXT_FRACHMBITS */
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			| p->ext_frach) == 0) {
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			*ex = 0;
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		} else {
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			x *= 0x1.0p514;
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			*ex = p->ext_exp - 0x4200;
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			p->ext_exp = 0x3ffe;
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		}
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		break;
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	case 0x7fff:	/* infinity or NaN; value of *ex is unspecified */
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		break;
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	default:	/* normal */
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		*ex = p->ext_exp - 0x3ffe;
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		p->ext_exp = 0x3ffe;
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		break;
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	}
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	return x;
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}
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DEF_STD(frexpl);