[Solved] In ARM assembly, what effect does the CMP instruction have on the processor flags? — Ans: It updates the condition flags based on the subtraction of two operands without... | ARM Architecture

ARM Architecture - Control Flow Instructions

In ARM assembly, what effect does the CMP instruction have on the processor flags?

AIt loads a value from memory into a register

BIt moves data from one register to another

CIt performs a logical AND operation between two registers

DIt updates the condition flags based on the subtraction of two operands without storing the result

Step-by-Step Solution

Solution:

Step 1: Understand CMP operation
The CMP instruction subtracts the second operand from the first but does not store the result.
Step 2: Effect on flags
It updates the condition flags (N, Z, C, V) based on this subtraction to be used by subsequent conditional instructions.
Final Answer:
It updates the condition flags based on the subtraction of two operands without storing the result -> Option D
Quick Check:
CMP affects flags only, no data movement [OK]

Quick Trick: CMP sets flags by subtracting operands without saving result [OK]

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