x = (x & 0x0000FF00) << 8 | (x >> 8) & 0x0000FF00 | x & 0xFF0000FF;
x = (x & 0x00F000F0) << 4 | (x >> 4) & 0x00F000F0 | x & 0xF00FF00F;
x = (x & 0x0C0C0C0C) << 2 | (x >> 2) & 0x0C0C0C0C | x & 0xC3C3C3C3;
x = (x & 0x22222222) << 1 | (x >> 1) & 0x22222222 | x & 0x99999999;