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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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✗✓✓ |
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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); |