FreeBSD/Linux Kernel Cross Reference
sys/libkern/ashldi3.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include <libkern/quad.h>
40
41 /*
42 * Shift a (signed) quad value left (arithmetic shift left).
43 * This is the same as logical shift left!
44 */
45 quad_t
46 __ashldi3(quad_t a, qshift_t shift)
47 {
48 union uu aa;
49
50 aa.q = a;
51 if (shift >= LONG_BITS) {
52 aa.ul[H] = shift >= QUAD_BITS ? 0 :
53 aa.ul[L] << (shift - LONG_BITS);
54 aa.ul[L] = 0;
55 } else if (shift > 0) {
56 aa.ul[H] = (aa.ul[H] << shift) |
57 (aa.ul[L] >> (LONG_BITS - shift));
58 aa.ul[L] <<= shift;
59 }
60 return (aa.q);
61 }
62
63 #ifdef __ARM_EABI__
64 long long __aeabi_llsl(long long, int);
65
66 long long
67 __aeabi_llsl(long long a, int b)
68 {
69 return __ashldi3(a, b);
70 }
71 #endif
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