Processor Flow Quiz

What does the `MOVSB` instruction do in assembly?

• Moves a word from the source to the destination.

• Moves a byte from the source to the destination.

• Moves a byte from one register to another.

• Copies a byte from the destination to the source.

Which register is typically used for string manipulation as the source index?

• BX

• SI

• AX

• DI

The `REP` prefix is used with which type of instructions?

• String instructions

• Bitwise instructions

• Arithmetic instructions

• Control flow instructions

Which flag is checked to determine if a string comparison using `CMP` was successful?

• Overflow Flag (OF)

• Zero Flag (ZF)

• Carry Flag (CF)

• Sign Flag (SF)

What is the purpose of the `INT` instruction in assembly language?

• To perform arithmetic operations on integers.

• To define a new data type in assembly language.

• To allocate memory for variables.

• To generate a software interrupt for system calls or event handling.

Which instruction is used to clear the carry flag?

• RLC

• SBC

• CLC

• STC

What does the `LODSB` instruction do?

• The LODSB instruction loads a byte from memory into the AL register.

• The LODSB instruction loads a byte from the AL register into memory.

• The LODSB instruction stores a byte from the AL register into memory.

• The LODSB instruction loads a word from memory into the AX register.

Which register is used as the destination index for string operations?

• RDI

• EDI

• AX

• ESI

What is the effect of the `STC` instruction?

• Sets the zero flag (ZF) to 1.

• Increments the instruction pointer (IP) by 1.

• Clears the carry flag (CF) to 0.

• Sets the carry flag (CF) to 1.

Which instruction is used to compare two strings in assembly?

• CMPSB

• CMP

• STRCMP

• COMPARE