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| /*
| * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
| *
| * Copyright (C) 2002-2011 Aleph One Ltd.
| * for Toby Churchill Ltd and Brightstar Engineering
| *
| * Created by Charles Manning <charles@aleph1.co.uk>
| *
| * This program is free software; you can redistribute it and/or modify
| * it under the terms of the GNU General Public License version 2 as
| * published by the Free Software Foundation.
| */
|
| /* These functions have been renamed to hweightxx to match the
| * equivaqlent functions in the Linux kernel.
| */
|
| #include "yaffs_hweight.h"
|
| static const char yaffs_count_bits_table[256] = {
| 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
| 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
| 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
| 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
| 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
| 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
| 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
| 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
| 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
| 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
| 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
| 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
| 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
| 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
| 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
| 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
| };
|
| int yaffs_hweight8(u8 x)
| {
| int ret_val;
| ret_val = yaffs_count_bits_table[x];
| return ret_val;
| }
|
| int yaffs_hweight32(u32 x)
| {
| return yaffs_hweight8(x & 0xff) +
| yaffs_hweight8((x >> 8) & 0xff) +
| yaffs_hweight8((x >> 16) & 0xff) +
| yaffs_hweight8((x >> 24) & 0xff);
| }
|
|
