What optimizations does the Rust compiler make with `loop` versus` while true?

Question

What optimizations does the Rust compiler make with `loop` versus` while true?

Apart from the fact that he can reason about uninitialized values set in the body loop

, are there any other compelling reasons for existence loop

?

+3

optimization infinite-loop rust

sa___ 03 june 17 at 17:08

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1 answer

user2722968 · Accepted Answer · 2017-06-03T17:22:15+0000

Other than what you state your intention, there is no difference. All loops are the same once the compiler has normalized.

See an example loop

on the Rust playground and the same example withwhile true

. The generated assembly is exactly the same. The compiler gives a warning for while true

-example to use loop

instead.

What optimizations does the Rust compiler make with `loop` versus` while true?

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