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Chapter 17 -- 80386 Instruction Set
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INC -- Increment by 1
Opcode Instruction Clocks Description
FE /0 INC r/m8 Increment r/m byte by 1
FF /0 INC r/m16 Increment r/m word by 1
FF /6 INC r/m32 Increment r/m dword by 1
40 + rw INC r16 Increment word register by 1
40 + rd INC r32 Increment dword register by 1
Operation
DEST := DEST + 1;
Description
INC adds 1 to the operand. It does not change the carry flag. To affect
the carry flag, use the
ADD instruction with a second operand of 1.
Flags Affected
OF, SF, ZF, AF, and PF as described in Appendix C
Protected Mode Exceptions
#GP(0) if the operand is in a nonwritable segment; #GP(0) for an illegal
memory operand effective address in the CS, DS, ES, FS, or GS
segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code)
for a page fault
Real Address Mode Exceptions
Interrupt 13 if any part of the operand would lie outside of the effective
address space from 0 to 0FFFFH
Virtual 8086 Mode Exceptions
Same exceptions as in Real Address Mode; #PF(fault-code) for a page
fault
up:
Chapter 17 -- 80386 Instruction Set
prev: IN Input from Port
next: INS/INSB/INSW/INSD Input from Port to String