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1 | /* This file is part of the Linux Trace Toolkit trace reading library |
2 | * Copyright (C) 2003-2004 Mathieu Desnoyers |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License Version 2.1 as published by the Free Software Foundation. |
7 | * |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
16 | * Boston, MA 02111-1307, USA. |
17 | */ |
18 | |
19 | #ifndef COMPILER_H |
20 | #define COMPILER_H |
21 | |
22 | /* Fast prediction if likely branches */ |
23 | #define likely(x) __builtin_expect(!!(x), 1) |
24 | #define unlikely(x) __builtin_expect(!!(x), 0) |
25 | |
2ac312e3 |
26 | |
27 | /* |
28 | * Check at compile time that something is of a particular type. |
29 | * Always evaluates to 1 so you may use it easily in comparisons. |
30 | */ |
31 | #define typecheck(type,x) \ |
32 | ({ type __dummy; \ |
33 | typeof(x) __dummy2; \ |
34 | (void)(&__dummy == &__dummy2); \ |
35 | 1; \ |
36 | }) |
37 | |
38 | /* Deal with 32 wrap correctly */ |
39 | #define guint32_after(a,b) \ |
40 | (typecheck(guint32, a) && \ |
41 | typecheck(guint32, b) && \ |
42 | ((gint32)(b) - (gint32)(a) < 0)) |
43 | #define guint32_before(a,b) guint32_after(b,a) |
44 | |
45 | #define guint32_after_eq(a,b) \ |
46 | (typecheck(guint32, a) && \ |
47 | typecheck(guint32, b) && \ |
48 | ((gint32)(b) - (gint32)(a) <= 0)) |
49 | #define guint32_before_eq(a,b) guint32_after_eq(b,a) |
50 | |
51 | |
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52 | #endif //COMPILER_H |