Fastest way to check if two integers are on the same side of 0

Question

I need to check if two integers are on the same side of zero many times. I don\'t care if it\'s positive or negative, just that it\'s the same side... and performance is very im

Answer 1

I would bitcast them to unsigned int, and xor the MSB (most-significant-bit) - much faster than any comparison (which does a subtraction) or multiplication