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INC Increment Operand
Flags affected:
O D I T S Z A P C OF: Overflow flag TF: Trap flag AF: Aux carry
F F F F F F F F F DF: Direction flag SF: Sign flag PF: Parity flag
* * * * * IF: Interrupt flag ZF: Zero flag CF: Carry flag
Legal forms:
INC r8
INC m8
INC r16
INC m16
INC r32 386+
INC m32 386+
Examples:
INC AL
INC BX
INC EDX
INC BYTE [BP] ; Increments the BYTE at [BP]
INC WORD [BX] ; Increments the WORD at [BX]
INC DWORD [ESI] ; Increments the DWORD at [ESI]
Notes:
Remember that segment registers cannot be incremented with INC. All register-half (r8) opcodes are 2 bytes in length, but all 16-bit register (r16) opcodes are 1 byte in length. If you can increment an entire register of which only the lower half contains data, use the 16-bit opcode and save a byte.As with all instructions that act on memory, memory data forms must be used with a data size specifier such as BYTE, WORD, and DWORD! NASM doesn't assume anything!
r8 = AL AH BL BH CL CH DL DH r16 = AX BX CX DX BP SP SI DI
sr = CS DS SS ES FS GS r32 = EAX EBX ECX EDX EBP ESP ESI EDI
m8 = 8-bit memory data m16 = 16-bit memory data
m32 = 32-bit memory data i8 = 8-bit immediate data
i16 = 16-bit immediate data i32 = 32-bit immediate data
d8 = 8-bit signed displacement d16 = 16-bit signed displacement
d32 = 32-bit unsigned displacement
