Re:Speed of Rust vs. C
by masklinn on Saturday March 13, 2021 @12:19PM
(#26448012)
And just like that we're back to
> There's a significant difference between what these languages can achieve in theory, and how they're used in practice.
Theoretically in C you can use restrict for this. Practically nobody does (rust users keep finding bugs and miscompilation in LLVM's noalias support), and it's a huge footgun because you're completely on your own and all bets are off if you misuse it.
Meanwhile in rust land, it's the default and the compiler checks your homework, and while you can always lie to the compiler it's much rarer that you'd even get in a position to do so.
> There's a significant difference between what these languages can achieve in theory, and how they're used in practice.
Theoretically in C you can use restrict for this. Practically nobody does (rust users keep finding bugs and miscompilation in LLVM's noalias support), and it's a huge footgun because you're completely on your own and all bets are off if you misuse it.
Meanwhile in rust land, it's the default and the compiler checks your homework, and while you can always lie to the compiler it's much rarer that you'd even get in a position to do so.