[Solved] What does the BL instruction do in ARM architecture? — Ans: It jumps to a subroutine and saves the return address in the link register. | ARM Architecture

ARM Architecture - Control Flow Instructions

What does the BL instruction do in ARM architecture?

AIt jumps to a subroutine and saves the return address in the link register.

BIt loads a value into a register.

CIt performs a bitwise AND operation.

DIt returns from a subroutine without saving the return address.

Step-by-Step Solution

Solution:

Step 1: Understand the purpose of BL
The BL instruction is used to jump to a subroutine while saving the return address.
Step 2: Identify where the return address is saved
The return address is saved in the link register (LR) to allow returning after the subroutine finishes.
Final Answer:
It jumps to a subroutine and saves the return address in the link register. -> Option A
Quick Check:
BL saves return address in LR [OK]

Quick Trick: BL jumps and saves return address in LR [OK]

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