LC

Loops and Conditional Branches in ARM

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ARM Registers: x0-x30, sp, lr, pc ARM Function Calling Conventions

Language

Compiler

2.0s Limit 256MB

Implementation

Write a loop in ARM assembly to sum numbers from 1 to N.

Requirements:

Write loop that sums numbers 1 to N
Use CMP for comparison
Use conditional branch (B.LT, B.GE, etc.)
Use SUBS to decrement and set flags
Return result in X0

Why This Matters

ARM's compare-and-branch idioms (cbz, b.cond) and its historically conditional instruction set are why ARM code often has fewer branches than x86 — relevant on modern cores where mispredictions cost 15+ cycles. This is the control flow running in every Android app and iOS frame render.

Hints

0 / 3 revealed

Validation Suite

main.c

Workspace 1.0