word = ((word & 0xAAAA) >> 1) + (word & 0x5555);
word = ((word & 0xCCCC) >> 2) + (word & 0x3333);
word = ((word & 0xF0F0) >> 4) + (word & 0x0F0F);
word = ((word & 0xFF00) >> 8) + (word & 0x00FF);
word = ((word & 0xAAAA) >> 1) + (word & 0x5555);
word = ((word & 0xCCCC) >> 2) + (word & 0x3333);
word = ((word & 0xF0F0) >> 4) + (word & 0x0F0F);
word = ((word & 0xFF00) >> 8) + (word & 0x00FF);