1168404Spjd/*	$NetBSD: fixunsdfsi_ieee754.c,v 1.2 2012/08/05 04:28:58 matt Exp $	*/
2168404Spjd/*-
3168404Spjd * Copyright (c) 2011 The NetBSD Foundation, Inc.
4168404Spjd * All rights reserved.
5168404Spjd *
6168792Sru * This code is derived from software contributed to The NetBSD Foundation
7168404Spjd * by Matt Thomas of 3am Software Foundry.
8168792Sru *
9168404Spjd * Redistribution and use in source and binary forms, with or without
10168792Sru * modification, are permitted provided that the following conditions
11168404Spjd * are met:
12168792Sru * 1. Redistributions of source code must retain the above copyright
13168404Spjd *    notice, this list of conditions and the following disclaimer.
14168792Sru * 2. Redistributions in binary form must reproduce the above copyright
15168404Spjd *    notice, this list of conditions and the following disclaimer in the
16168792Sru *    documentation and/or other materials provided with the distribution.
17168404Spjd *
18168792Sru * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19168792Sru * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20168792Sru * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21168792Sru * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22168792Sru * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23168404Spjd * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24168792Sru * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25168792Sru * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26168404Spjd * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27168792Sru * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28168792Sru * POSSIBILITY OF SUCH DAMAGE.
29168792Sru */
30168792Sru
31168792Sru#include <sys/cdefs.h>
32168792Sru
33168792Sru#if defined(LIBC_SCCS) && !defined(lint)
34168792Sru__RCSID("$NetBSD: fixunsdfsi_ieee754.c,v 1.2 2012/08/05 04:28:58 matt Exp $");
35168792Sru#endif /* LIBC_SCCS and not lint */
36168792Sru
37168792Sru#include <stdbool.h>
38168404Spjd#include <stdint.h>
39168792Sru#include <float.h>
40168792Sru#include <machine/ieee.h>
41168404Spjd
42168404Spjd#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
43168404Spjd#include "softfloat/softfloat-for-gcc.h"
44168404Spjd#endif
45168404Spjd
46uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *);
47
48uint32_t __fixunsdfsi(double);
49
50/*
51 * Convert double to (unsigned) int.  All operations are done module 2^32.
52 */
53uint32_t
54__fixunsdfsi(double x)
55{
56	const union ieee_double_u dblu = { .dblu_d = x };
57	const uint32_t frac[(DBL_FRACBITS + 31)/32 + 1] = {
58		[0] = 0,
59		[1] = dblu.dblu_dbl.dbl_fracl,
60		[2] = dblu.dblu_dbl.dbl_frach,
61	};
62
63	return __fixunsgen32(
64		dblu.dblu_dbl.dbl_exp - DBL_EXP_BIAS,
65		dblu.dblu_dbl.dbl_sign != 0,
66		DBL_MANT_DIG,
67		DBL_FRACHBITS,
68		&frac[__arraycount(frac)-1]);
69}
70