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| author | David 'Digit' Turner <digit@android.com> | 2011-01-16 16:25:10 +0100 |
|---|---|---|
| committer | David 'Digit' Turner <digit@android.com> | 2011-01-18 20:53:34 +0100 |
| commit | 122b335f58e2f52d542854dcddef8723a2b213a4 (patch) | |
| tree | f801422c45756dfcdfa9562aefce1a4a7f728c4c /android/utils | |
| parent | 197e5f763ec8a6d514d59647c84ebd9b324eba97 (diff) | |
| download | external_qemu-122b335f58e2f52d542854dcddef8723a2b213a4.zip external_qemu-122b335f58e2f52d542854dcddef8723a2b213a4.tar.gz external_qemu-122b335f58e2f52d542854dcddef8723a2b213a4.tar.bz2 | |
Sligh speedup for pixel conversion routines with Duff's device.
Change-Id: If832bc5844945f7a2027b2f8d09393586545d8d5
Diffstat (limited to 'android/utils')
| -rw-r--r-- | android/utils/duff.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/android/utils/duff.h b/android/utils/duff.h new file mode 100644 index 0000000..a00768c --- /dev/null +++ b/android/utils/duff.h @@ -0,0 +1,71 @@ +/* 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 */ |