1/*	$OpenBSD: fixunssfdi.c,v 1.1 2022/09/03 08:26:05 mbuhl Exp $	*/
2/*	$NetBSD: fixunssfdi_ieee754.c,v 1.1 2013/08/24 00:51:48 matt Exp $	*/
3
4/*-
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38#if defined(LIBC_SCCS) && !defined(lint)
39__RCSID("$NetBSD: fixunssfdi_ieee754.c,v 1.1 2013/08/24 00:51:48 matt Exp $");
40#endif /* LIBC_SCCS and not lint */
41
42#if defined(SOFTFLOAT) || defined(__ARM_EABI__)
43#include "softfloat/softfloat-for-gcc.h"
44#endif
45
46#include "../../../quad/quad.h"
47#include <limits.h>
48#include <machine/ieee.h>
49
50/*
51 * Convert float to unsigned quad.
52 * Not sure what to do with negative numbers---for now, anything out
53 * of range becomes UQUAD_MAX.
54 */
55u_quad_t
56__fixunssfdi(float x)
57{
58	struct ieee_single ux = *(struct ieee_single *)&x;
59	signed int exp = ux.sng_exp - SNG_EXP_BIAS;
60	u_quad_t r;
61
62	if (ux.sng_sign)
63		return UQUAD_MAX;
64	if (exp > 63)
65		return UQUAD_MAX;
66	if (exp < 0)
67		return 0;
68
69	r = 1 << SNG_FRACBITS;		/* implicit bit */
70	r |= ux.sng_frac;
71	exp -= SNG_FRACBITS;
72	if (exp == 0)
73		return r;
74	if (exp < 0)
75		return r >> -exp;
76
77	return r << exp;
78}
79