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Which ARM assembly instruction is used to subtract 1 from a register and update condition flags for looping?

easy📝 Factual Q12 of 15
ARM Architecture - Control Flow Instructions
Which ARM assembly instruction is used to subtract 1 from a register and update condition flags for looping?
ASUBS
BMOV
CADD
DBNE
Step-by-Step Solution
Solution:

  1. Step 1: Identify the instruction that subtracts and sets flags

    SUBS subtracts a value and updates condition flags used for branching decisions.

  2. Step 2: Differentiate from other instructions

    ADD adds values, MOV moves data, BNE branches if not equal; only SUBS subtracts and sets flags.

  3. Final Answer:

    SUBS -> Option A

  4. Quick Check:

    SUBS subtracts and sets flags [OK]
Quick Trick: SUBS subtracts and updates flags for loop control [OK]
Common Mistakes:
  • Choosing ADD instead of SUBS
  • Confusing MOV with arithmetic
  • Using BNE as arithmetic instruction

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