1/*	$NetBSD: fixunssfsi_ieee754.c,v 1.2 2012/08/05 04:28:58 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: fixunssfsi_ieee754.c,v 1.2 2012/08/05 04:28:58 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(SOFTFLOAT) || defined(__ARM_EABI__)
43#include "softfloat/softfloat-for-gcc.h"
44#endif
45
46uint32_t __fixunsgen32(int, bool, size_t, size_t, const uint32_t *);
47
48uint32_t __fixunssfsi(float);
49
50/*
51 * Convert float to (unsigned) int.  All operations are done module 2^32.
52 */
53uint32_t
54__fixunssfsi(float x)
55{
56	const union ieee_single_u sngu = { .sngu_f = x };
57	const uint32_t frac[(SNG_FRACBITS + 31)/32 + 1] = {
58		[0] = 0,
59		[1] = sngu.sngu_sng.sng_frac,
60	};
61
62	return __fixunsgen32(
63		sngu.sngu_sng.sng_exp - SNG_EXP_BIAS,
64		sngu.sngu_sng.sng_sign != 0,
65		FLT_MANT_DIG,
66		SNG_FRACBITS,
67		&frac[__arraycount(frac)-1]);
68}
69