1/*	$NetBSD: fixunsdfdi.c,v 1.8 2011/07/04 06:23:50 matt Exp $	*/
2/*-
3 * Copyright (c) 2011 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Matt Thomas of 3am Software Foundry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32
33#if defined(LIBC_SCCS) && !defined(lint)
34__RCSID("$NetBSD: fixunsdfdi.c,v 1.8 2011/07/04 06:23:50 matt Exp $");
35#endif /* LIBC_SCCS and not lint */
36
37#include <stdbool.h>
38#include <stdint.h>
39#include <float.h>
40#include <machine/ieee.h>
41
42#if defined(__x86_64__) || defined(__i486__)
43#define	FIXUNS	__fixunsxfdi
44#else
45#define	FIXUNS	__fixunstfdi
46#endif
47
48uint64_t __fixunsgen64(int, bool, size_t, size_t, const uint32_t *);
49
50uint64_t FIXUNS(long double);
51
52/*
53 * Convert long double to uint64_t.  All operations are done module 2^64.
54 */
55uint64_t
56FIXUNS(long double x)
57{
58	const union ieee_ext_u extu = { .extu_ld = x };
59	uint32_t frac[(EXT_FRACBITS + 31)/32 + 2];
60
61	frac[0] = 0;
62	frac[1] = 0;
63
64	EXT_TO_ARRAY32(extu, &frac[2]);
65
66	return __fixunsgen64(
67		extu.extu_ext.ext_exp - EXT_EXP_BIAS,
68		extu.extu_ext.ext_sign != 0,
69		LDBL_MANT_DIG,
70		EXT_FRACHBITS,
71		&frac[__arraycount(frac)-1]);
72}
73