Performance difference between obj.function(...) and function(obj, ...) ?

• cargo-show-asm

  15 581 9.1 Rust

  cargo subcommand showing the assembly, LLVM-IR and MIR generated for Rust code

While posting the code of an example would be the most helpful to work this out, if you can't or won't do that I'd suggest you check the difference in code generation in the two cases. You can use cargo-show-asm, godbolt, or just cargo to output assembly or LLVM IR for a relevant part of your hot loop. That should give you some clues.

• compiler-explorer

  191 15,138 9.9 TypeScript

  Run compilers interactively from your web browser and interact with the assembly

  

That sounds weird, the calls should produce identical machine code if all other factors are equal. You can compare the generated assembly code at Compiler Explorer. And yes, be sure to build with optimizations turned on.

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• cargo-asm

  13 1,104 0.0 Rust

  cargo subcommand showing the assembly or llvm-ir generated for Rust code

cargo asm might be useful here (if you can't use godbolt).

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