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
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/* $NetBSD: floatunditf_ieee754.c,v 1.4 2012/08/05 04:28:58 matt Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This software was developed by the Computer Systems Engineering group
|
|
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
|
|
* contributed to Berkeley.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)floatunsdidf.c 8.1 (Berkeley) 6/4/93";
|
|
#else
|
|
__RCSID("$NetBSD: floatunditf_ieee754.c,v 1.4 2012/08/05 04:28:58 matt Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#ifdef SOFTFLOAT
|
|
#include "softfloat/softfloat-for-gcc.h"
|
|
#endif
|
|
|
|
#include "quad.h"
|
|
#ifdef __vax__
|
|
#error vax does not support a distinct long double
|
|
#endif
|
|
#include <machine/ieee.h>
|
|
|
|
/*
|
|
* Convert (unsigned) quad to long double.
|
|
* This is exactly like floatdidf.c except that negatives never occur.
|
|
*/
|
|
long double
|
|
__floatunditf(u_quad_t x)
|
|
{
|
|
#if 0
|
|
long double ld;
|
|
union uu u;
|
|
|
|
u.uq = x;
|
|
ld = (long double)u.ul[H] * (((int)1 << (INT_BITS - 2)) * 4.0);
|
|
ld += u.ul[L];
|
|
return (ld);
|
|
#else
|
|
union ieee_ext_u extu;
|
|
quad_t tmp = x; /* must be signed */
|
|
unsigned int width = 64;
|
|
unsigned int bit = 0;
|
|
quad_t mask = ~(quad_t)0;
|
|
|
|
if (x == 0)
|
|
return 0.0L;
|
|
if (x == 1)
|
|
return 1.0L;
|
|
|
|
while (mask != 0 && (tmp >= 0)) {
|
|
width >>= 1;
|
|
mask <<= width;
|
|
if ((tmp & mask) == 0) {
|
|
tmp <<= width;
|
|
bit += width;
|
|
}
|
|
}
|
|
|
|
x <<= (bit + 1);
|
|
extu.extu_sign = 0;
|
|
extu.extu_exp = EXT_EXP_BIAS + (64 - (bit + 1));
|
|
extu.extu_frach = (unsigned int)(x >> (64 - EXT_FRACHBITS));
|
|
x <<= EXT_FRACHBITS;
|
|
#ifdef EXT_FRACHMBITS
|
|
extu.extu_frachm =(unsigned int)(x >> (64 - EXT_FRACHMBITS));
|
|
x <<= EXT_FRACHMBITS;
|
|
#endif
|
|
#ifdef EXT_FRACLMBITS
|
|
extu.extu_fraclm =(unsigned int)(x >> (64 - EXT_FRACLMBITS));
|
|
x <<= EXT_FRACLMBITS;
|
|
#endif
|
|
extu.extu_fracl =(unsigned int)(x >> (64 - EXT_FRACLBITS));
|
|
|
|
return extu.extu_ld;
|
|
#endif
|
|
}
|