1 /* $NetBSD: fixunstfdi_ieee754.c,v 1.2 2024/01/05 09:41:58 rin 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: fixunstfdi_ieee754.c,v 1.2 2024/01/05 09:41:58 rin Exp $");
35 #endif /* LIBC_SCCS and not lint */
36
37 #include <stdbool.h>
38 #include <stddef.h>
39 #include <stdint.h>
40 #include <float.h>
41 #include <machine/ieee.h>
42
43 #if defined(__x86_64__) || defined(__i486__)
44 #define FIXUNS __fixunsxfdi
45 #else
46 #define FIXUNS __fixunstfdi
47 #endif
48
49 uint64_t __fixunsgen64(int, bool, size_t, size_t, const uint32_t *);
50
51 uint64_t FIXUNS(long double);
52
53 /*
54 * Convert long double to uint64_t. All operations are done module 2^64.
55 */
56 uint64_t
FIXUNS(long double x)57 FIXUNS(long double x)
58 {
59 const union ieee_ext_u extu = { .extu_ld = x };
60 uint32_t frac[(EXT_FRACBITS + 31)/32 + 2];
61
62 frac[0] = 0;
63 frac[1] = 0;
64
65 EXT_TO_ARRAY32(extu, &frac[2]);
66
67 return __fixunsgen64(
68 extu.extu_ext.ext_exp - EXT_EXP_BIAS,
69 extu.extu_ext.ext_sign != 0,
70 LDBL_MANT_DIG,
71 EXT_FRACHBITS,
72 &frac[__arraycount(frac)-1]);
73 }
74