f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/* $NetBSD: floatunditf_ieee754.c,v 1.4 2012/08/05 04:28:58 matt Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)floatunsdidf.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: floatunditf_ieee754.c,v 1.4 2012/08/05 04:28:58 matt Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#ifdef SOFTFLOAT
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#include "softfloat/softfloat-for-gcc.h"
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#endif
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#include "quad.h"
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#ifdef __vax__
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#error vax does not support a distinct long double
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#endif
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#include <machine/ieee.h>
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/*
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* Convert (unsigned) quad to long double.
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* This is exactly like floatdidf.c except that negatives never occur.
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*/
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long double
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__floatunditf(u_quad_t x)
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{
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#if 0
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long double ld;
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union uu u;
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u.uq = x;
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ld = (long double)u.ul[H] * (((int)1 << (INT_BITS - 2)) * 4.0);
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ld += u.ul[L];
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return (ld);
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#else
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union ieee_ext_u extu;
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quad_t tmp = x; /* must be signed */
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unsigned int width = 64;
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unsigned int bit = 0;
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quad_t mask = ~(quad_t)0;
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if (x == 0)
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return 0.0L;
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if (x == 1)
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return 1.0L;
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while (mask != 0 && (tmp >= 0)) {
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width >>= 1;
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mask <<= width;
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if ((tmp & mask) == 0) {
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tmp <<= width;
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bit += width;
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}
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}
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x <<= (bit + 1);
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extu.extu_sign = 0;
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extu.extu_exp = EXT_EXP_BIAS + (64 - (bit + 1));
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extu.extu_frach = (unsigned int)(x >> (64 - EXT_FRACHBITS));
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x <<= EXT_FRACHBITS;
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#ifdef EXT_FRACHMBITS
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extu.extu_frachm =(unsigned int)(x >> (64 - EXT_FRACHMBITS));
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x <<= EXT_FRACHMBITS;
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#endif
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#ifdef EXT_FRACLMBITS
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extu.extu_fraclm =(unsigned int)(x >> (64 - EXT_FRACLMBITS));
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x <<= EXT_FRACLMBITS;
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#endif
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extu.extu_fracl =(unsigned int)(x >> (64 - EXT_FRACLBITS));
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return extu.extu_ld;
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#endif
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}
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