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[lttv.git] / lttv / lttv / compiler.h

/* This file is part of the Linux Trace Toolkit trace reading library
 * Copyright (C) 2003-2004 Mathieu Desnoyers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License Version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef COMPILER_H
#define COMPILER_H

/* Fast prediction if likely branches */
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
 

/*
 * Check at compile time that something is of a particular type.
 * Always evaluates to 1 so you may use it easily in comparisons.
 */
#define typecheck(type,x) \
({  type __dummy; \
  typeof(x) __dummy2; \
  (void)(&__dummy == &__dummy2); \
  1; \
})

/* Deal with 32 wrap correctly */
#define guint32_after(a,b) \
  (typecheck(guint32, a) && \
   typecheck(guint32, b) && \
   ((gint32)(b) - (gint32)(a) < 0))
#define guint32_before(a,b)  guint32_after(b,a)

#define guint32_after_eq(a,b) \
  (typecheck(guint32, a) && \
   typecheck(guint32, b) && \
   ((gint32)(b) - (gint32)(a) <= 0))
#define guint32_before_eq(a,b)  guint32_after_eq(b,a)

#define __EXPORT __attribute__ ((visibility ("default")))

#ifndef max
#define max(a,b) ((a)>(b)?(a):(b))
#endif

#ifndef min
#define min(a,b) ((a)<(b)?(a):(b))
#endif

#endif //COMPILER_H