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/* Copyright (C) 2011 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program 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 General Public License for more details.
*/
#ifndef ANDROID_UTILS_DUFF_H
#define ANDROID_UTILS_DUFF_H
/*********************************************************************
*********************************************************************
*****
***** DUFF'S DEVICES
*****
*****/
#define DUFF1(_count,_stmnt) \
do { \
int __n = (_count); \
do { \
_stmnt; \
} while (--__n > 0); \
} while (0);
#define DUFF2(_count,_stmnt) \
({ \
int __count = (_count); \
int __n = (__count +1)/2; \
switch (__count & 1) { \
case 0: do { _stmnt; \
case 1: _stmnt; \
} while (--__n > 0); \
} \
})
#define DUFF4(_count,_stmnt) \
({ \
int __count = (_count); \
int __n = (__count +3)/4; \
switch (__count & 3) { \
case 0: do { _stmnt; \
case 3: _stmnt; \
case 2: _stmnt; \
case 1: _stmnt; \
} while (--__n > 0); \
} \
})
#define DUFF8(_count,_stmnt) \
({ \
int __count = (_count); \
int __n = (__count+7)/8; \
switch (__count & 7) { \
case 0: do { _stmnt; \
case 7: _stmnt; \
case 6: _stmnt; \
case 5: _stmnt; \
case 4: _stmnt; \
case 3: _stmnt; \
case 2: _stmnt; \
case 1: _stmnt; \
} while (--__n > 0); \
} \
})
#endif /* ANDROID_UTILS_DUFF_H */
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