diff options
Diffstat (limited to 'xdiff/xutils.c')
| -rw-r--r-- | xdiff/xutils.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/xdiff/xutils.c b/xdiff/xutils.c index 202111779..179bc4fe0 100644 --- a/xdiff/xutils.c +++ b/xdiff/xutils.c @@ -309,19 +309,11 @@ static inline long count_masked_bytes(unsigned long mask) long a = (REPEAT_BYTE(0x01) / 0xff + 1); return mask * a >> (sizeof(long) * 7); } else { - /* - * Modified Carl Chatfield G+ version for 32-bit * - * - * (a) gives us - * -1 (0, ff), 0 (ffff) or 1 (ffffff) - * (b) gives us - * 0 for 0, 1 for (ff ffff ffffff) - * (a+b+1) gives us - * correct 0-3 bytemask count result - */ - long a = (mask - 256) >> 23; - long b = mask & 1; - return a + b + 1; + /* Carl Chatfield / Jan Achrenius G+ version for 32-bit */ + /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */ + long a = (0x0ff0001 + mask) >> 23; + /* Fix the 1 for 00 case */ + return a & mask; } } |