x86 has remainder: IDIV calculates both the quotient and the remainder at the same time and places them in different registers just like many other ISAs before

x86 has remainder: IDIV calculates both the quotient and the remainder at the same time and places them in different registers just like many other ISAs before it did. In fact, DIV instruction of PDP-11 worked that way too: Description: The 32-bit two's complement integer in R and Rv1 is divided by the source operand. The quotient is left in R; the remain- der in Rv1. Division will be performed so that the remainder is of the same sign as the dividend. R must be even. Example: CLR RO MOV #20001,R1 DIV #2, RO Before After (RO) = 000000 (RO) = 010000 Quotient (R1) = 020001 (R1) = 000001 Remainder PDP-11 also had ADC and SBC (add/subtract with carry) instructions which weren't (and still aren't) exposed in C either.