INC

Table of Contents

1. INC (inc)
   1. Basic Function
   2. Instruction Execution Process
   3. Instruction Format
   4. Behavioral Characteristics
   5. Common Uses

INC (inc)

Basic Function

The INC instruction performs a +1 operation on the operand:
dest = dest + 1

Instruction Execution Process

• Add 1 to the destination operand
• Update all flags except CF

Instruction Format

1
inc r/m8
2
inc r/m16
3
inc r/m32
4
inc r/m64

Behavioral Characteristics

• Does not modify CF (unlike ADD x,1)
• Modifies flags such as ZF, SF, PF, OF, and AF
• Very fast operation, but when used in arithmetic, pay attention to OF

Common Uses

• Incrementing loop counters
• Auto-incrementing stack variables and pointers
• Gradually accumulating when constructing numbers
• Constructing data byte-by-byte with offsets in certain encoders/decryptors