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Rust also has (relatively) bad compile times due to generics. Not as bad as C++, but you can notice it's significantly worse than Go.
by FooBarWidget 5y ago
Rust also has (relatively) bad compile times due to generics. Not as bad as C++, but you can notice it's significantly worse than Go.
- pjmlp 5y agoD, Ada, Eiffel, Delphi go as counter example, and C++ modules are already proving a much better experience in VC++.
- FooBarWidget 5y agoDelphi didn't have generics. Not sure about more modern versions, but the power of the generics also impacts compile times. Java generics barely impact compile times at all but they're also nowhere as powerful as Rust and C++ ones.
- pjmlp 5y agoYou stop using Delphi long time ago, I would say. To pick one of my examples, D templates and compile time metaprogramming are even more powerfull than Rust and C++ ones, yet it compiles just as fast.
- benibela 5y agoDelphi added generics in 2009 So it had them roughly as long as Go existed
- yakubin 5y agoRust does compile slower than Go, but it's not due to generics. It's mostly due to LLVM codegen and procedural macros. Go has the benefit of not relying on LLVM and not having procedural macros.
- codeflo 5y agoAbsolutely true. I’d add that Rust is also doing a lot more expensive optimizations in release builds.
- jcelerier 5y agoUntil recently Go didn't even use registers for passing arguments, it just put everything on the stack like in a 1965 textbook (https://go.googlesource.com/proposal/+/refs/changes/78/248178/1/design/40724-register-calling.md https://go.googlesource.com/proposal/+/refs/changes/78/24817...)
- eloff 5y agoIf you mean for function calls, I believe you're correct, not taking into account inline functions. However, for code generation Go obviously uses registers since way before the 1.0 days.
- edflsafoiewq 5y agoA lot of the IR comes from expanding huge stacks of generic functions. I don't think the issue can't be neatly partitioned up like that.
- geodel 5y agoYou are right of course about LLVM being source of slowness. In general discussion I see around is that all Rust's perf optimizations are to Rust's credit (nothing about LLVM optimization) while all woes around Rust's compile time lay at step of LLVM and Rust is not be blamed.
- vyskocilm 5y agoThere is tinygo with llvm backend and the build times are abysmal.