function [ c ] = add8_425( a, b )
a = uint16(a);
b = uint16(b);
c = 0;
n2 = bitand(bitshift(a, -1), 1, 'uint16');
n4 = bitand(bitshift(a, -2), 1, 'uint16');
n6 = bitand(bitshift(a, -3), 1, 'uint16');
n8 = bitand(bitshift(a, -4), 1, 'uint16');
n10 = bitand(bitshift(a, -5), 1, 'uint16');
n12 = bitand(bitshift(a, -6), 1, 'uint16');
n14 = bitand(bitshift(a, -7), 1, 'uint16');
n18 = bitand(bitshift(b, -1), 1, 'uint16');
n20 = bitand(bitshift(b, -2), 1, 'uint16');
n22 = bitand(bitshift(b, -3), 1, 'uint16');
n24 = bitand(bitshift(b, -4), 1, 'uint16');
n26 = bitand(bitshift(b, -5), 1, 'uint16');
n28 = bitand(bitshift(b, -6), 1, 'uint16');
n30 = bitand(bitshift(b, -7), 1, 'uint16');
n33 = bitxor(n22, n22);
n34 = bitcmp(n33);
n56 = bitcmp(n34);
n76 = bitcmp(bitand(n26, bitand(n30, n14)));
n82 = bitxor(bitxor(n2, n18), n56);
n83 = bitor(bitor(bitand(n2, n18), bitand(n18, n56)), bitand(n2, n56));
n132 = bitxor(bitxor(n4, n20), n83);
n133 = bitor(bitor(bitand(n4, n20), bitand(n20, n83)), bitand(n4, n83));
n182 = bitxor(bitxor(n6, n22), n133);
n183 = bitor(bitor(bitand(n6, n22), bitand(n22, n133)), bitand(n6, n133));
n232 = bitxor(bitxor(n8, n24), n183);
n233 = bitor(bitor(bitand(n8, n24), bitand(n24, n183)), bitand(n8, n183));
n282 = bitxor(bitxor(n10, n26), n233);
n283 = bitor(bitor(bitand(n10, n26), bitand(n26, n233)), bitand(n10, n233));
n332 = bitxor(bitxor(n12, n28), n283);
n333 = bitor(bitor(bitand(n12, n28), bitand(n28, n283)), bitand(n12, n283));
n382 = bitxor(bitxor(n14, n30), n333);
n383 = bitor(bitor(bitand(n14, n30), bitand(n30, n333)), bitand(n14, n333));
c = bitor(c, bitshift(bitand(n76, 1), 0));
c = bitor(c, bitshift(bitand(n82, 1), 1));
c = bitor(c, bitshift(bitand(n132, 1), 2));
c = bitor(c, bitshift(bitand(n182, 1), 3));
c = bitor(c, bitshift(bitand(n232, 1), 4));
c = bitor(c, bitshift(bitand(n282, 1), 5));
c = bitor(c, bitshift(bitand(n332, 1), 6));
c = bitor(c, bitshift(bitand(n382, 1), 7));
c = bitor(c, bitshift(bitand(n383, 1), 8));
end