1 /* $OpenBSD: fixunsdfdi.c,v 1.1 2022/09/03 08:26:05 mbuhl Exp $ */
2 /* $NetBSD: fixunsdfdi_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: fixunsdfdi_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 double to unsigned quad.
52 * Not sure what to do with negative numbers---for now, anything out
53 * of range becomes UQUAD_MAX.
54 */
55 u_quad_t
__fixunsdfdi(double x)56 __fixunsdfdi(double x)
57 {
58 struct ieee_double ux = *(struct ieee_double *)&x;
59 signed int exp = ux.dbl_exp - DBL_EXP_BIAS;
60 u_quad_t r;
61
62 if (ux.dbl_sign)
63 return UQUAD_MAX;
64 if (exp > 63)
65 return UQUAD_MAX;
66 if (exp < 0)
67 return 0;
68
69 r = 1 << DBL_FRACHBITS; /* implicit bit */
70 r |= ux.dbl_frach;
71 exp -= DBL_FRACHBITS;
72 if (exp == 0)
73 return r;
74 if (exp < 0)
75 return r >> -exp;
76
77 r <<= DBL_FRACLBITS;
78 r |= ux.dbl_fracl;
79 exp -= DBL_FRACLBITS;
80 if (exp == 0)
81 return r;
82 if (exp < 0)
83 return r >> -exp;
84
85 return r << exp;
86 }
87