Rust Programming

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Which is faster? (self.rust)

submitted 1 month ago* (last edited 1 month ago) by commander to c/rust@lemmy.ml

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let mut variable: Type;
loop {
    variable = value;
}

loop {
    let variable: Type = value;
}

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[–] Giooschi@lemmy.world 3 points 1 month ago* (last edited 1 month ago) (1 children)

let statements only reserves space on the stack

It is not guaranteed to do that. It could also use a register or be optimized out completly (like in the example you posted in the other comment).

The stack pointer is also not changed for each local variable, but instead for each function call, so it wouldn't make a difference anyway.

[–] anhkagi@jlai.lu 1 points 1 month ago

Ok! Thanks for the clarification !