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x86 e x64

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Códigos x86-64 tendem a ter um cadinhozinho de performance melhor por um dois simples fatos:

1- A convenção de chamada usa registradores, ao invés da pilha, demandando menos acesso à memória;
2- Pode-se manipular duas vezes mais dados (registradores de 64 bits) numa tacada só...

O ganho, aliás, não é exacerbado... digamos de uns 5% a 10% mais rápido, dependendo do caso.

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