[Solved] Why does the ARM Thumb-2 architecture limit the IT block to a maximum of four instructions? — Ans: To keep instruction decoding simple and efficient | ARM Architecture

ARM Architecture - Control Flow Instructions

Why does the ARM Thumb-2 architecture limit the IT block to a maximum of four instructions?

ABecause ARM processors cannot execute more than four instructions conditionally

BTo prevent nested IT blocks

CTo keep instruction decoding simple and efficient

DTo limit power consumption during conditional execution

Step-by-Step Solution

Solution:

Step 1: Understand design goals of Thumb-2
Thumb-2 aims for compact code with simple decoding and efficient execution.
Step 2: Reason about IT block size
Limiting IT blocks to four instructions keeps the processor's instruction decoder simple and fast.
Final Answer:
To keep instruction decoding simple and efficient -> Option C
Quick Check:
IT block size limit = decoding simplicity [OK]

Quick Trick: IT block size limit simplifies decoding [OK]

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Why does the ARM Thumb-2 architecture limit the IT block to a maximum of four instructions?