BCD instructions were ubiquitous from the 8086 to the last x86-32 processor, but were so rarely used they weren't extended to 64-bits on x86-64 even though 'bac

BCD instructions were ubiquitous from the 8086 to the last x86-32 processor, but were so rarely used they weren't extended to 64-bits on x86-64 even though 'backward compatibility' was considered critical. So...probably more complicated.