2013-09-30 23:32:14 +04:00
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/* $NetBSD: floatundidf_ieee754.c,v 1.2 2013/09/30 19:32:14 mlelstv Exp $ */
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2013-08-24 04:51:48 +04:00
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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2013-09-30 23:32:14 +04:00
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__RCSID("$NetBSD: floatundidf_ieee754.c,v 1.2 2013/09/30 19:32:14 mlelstv Exp $");
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2013-08-24 04:51:48 +04:00
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#endif /* LIBC_SCCS and not lint */
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#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
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#include "softfloat/softfloat-for-gcc.h"
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#endif
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#include <limits.h>
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#include <machine/ieee.h>
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#include "quad.h"
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/*
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* Convert unsigned quad to double.
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*/
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double
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__floatundidf(u_quad_t x)
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{
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union ieee_double_u ux = { .dblu_d = 0.0 };
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if (x == 0)
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return 0.0;
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u_int l = __builtin_clzll(x);
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x <<= (l + 1); /* clear implicit bit */
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x >>= 64 - (DBL_FRACHBITS + DBL_FRACLBITS);
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union uu u = { .uq = x };
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ux.dblu_frach = u.ul[H];
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ux.dblu_fracl = u.ul[L];
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ux.dblu_exp = DBL_EXP_BIAS + 63 - l;
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return ux.dblu_d;
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}
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