INC adds 1 to its operand. It does not affect the carry
flag: to affect the carry flag, use ADD something,1 (see
ADD). INC affects all the other flags according to the result.
This instruction can be used with a LOCK prefix to allow atomic execution.
See also DEC (DEC).
Every form of inc the assembler accepts, from NASM's own instruction table.
The second column is the processor that introduced the form; a badge marks a form that needs
an extension, that is lockable, or that long mode dropped.
| Form | Since | Notes |
|---|---|---|
| inc reg16 | 8086 | nolong |
| inc reg32 | 386 | nolong |
| inc r/m8 | 8086 | lock |
| inc r/m16 | 8086 | lock |
| inc r/m32 | 386 | lock |
| inc r/m64 | x86-64 | locklong |
| inc [reg8], r/m8 | x86-64 | apxlocklong |
| inc [reg16], r/m16 | x86-64 | apxlocklong |
| inc [reg32], r/m32 | x86-64 | apxlocklong |
| inc [reg64], r/m64 | x86-64 | apxlocklong |
