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ARM recommends using Thumb2 for non-legacy software. Thumb2 is denser than x86, so actually ARM is the one with the advantage here (unless you have an existing ARM codebase).

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Isn't Thumb targeted for memory-constrained architectures?

Thumb1 sort of sucked at performance so the only people who used it were the ones who were very memory-constrained. Thumb2 is much better.

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