X86 microop ISA

Register Ops

Addition and subtraction

Add

add: Dest = Src1 + Src2

Adds the contents of the Src1 and Src2 registers and puts the result in the Dest register.

addi: Dest = Src1 + Imm

Adds the contents of the Src1 register and the immediate Imm and puts the result in the Dest register.

Flags

This microop optionally sets the CF, ECF, ZF, EZF, PF, AF, SF, and OF flags.

CF and ECF	The carry out of the most significant bit.
ZF and EZF	Whether the result was zero.
PF	The parity of the result.
AF	The carry from the 4th to 5th bit positions.
SF	The sign of the result.
OF	Whether there was an overflow.