minix/lib/libc/gen/fixunstfdi_ieee754.c
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* 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
2013-01-14 11:36:26 +01:00

72 lines
2.4 KiB
C

/* $NetBSD: fixunstfdi_ieee754.c,v 1.1 2011/07/09 02:30:27 matt Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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)
__RCSID("$NetBSD: fixunstfdi_ieee754.c,v 1.1 2011/07/09 02:30:27 matt Exp $");
#endif /* LIBC_SCCS and not lint */
#include <stdbool.h>
#include <stdint.h>
#include <float.h>
#include <machine/ieee.h>
#if defined(__x86_64__) || defined(__i486__)
#define FIXUNS __fixunsxfdi
#else
#define FIXUNS __fixunstfdi
#endif
uint64_t __fixunsgen64(int, bool, size_t, size_t, const uint32_t *);
uint64_t FIXUNS(long double);
/*
* Convert long double to uint64_t. All operations are done module 2^64.
*/
uint64_t
FIXUNS(long double x)
{
const union ieee_ext_u extu = { .extu_ld = x };
uint32_t frac[(EXT_FRACBITS + 31)/32 + 2];
frac[0] = 0;
frac[1] = 0;
EXT_TO_ARRAY32(extu, &frac[2]);
return __fixunsgen64(
extu.extu_ext.ext_exp - EXT_EXP_BIAS,
extu.extu_ext.ext_sign != 0,
LDBL_MANT_DIG,
EXT_FRACHBITS,
&frac[__arraycount(frac)-1]);
}