dagome·il y a 4 ans·discussSuch stark difference in performance is really fishy and needs a deeper analysis. I just checked it with different compilers (all based on LLVM) and here are the results: rustc 1.58 (LLVM 13): By-Copy: 10804, By-Borrow: 7198 rustc 1.64 (LLVM 14): By-Copy: 7385, By-Borrow: 7328 rustc 1.66 (LLVM 15): By-Copy: 2667, By-Borrow: 2777 clang++ (LLVM 14): By-Copy: 2439, By-Ref: 2589 clang++ (LLVM 15): By-Copy: 2473, By-Ref: 2556 When compared with the same LLVM version clang much better utilised LLVM-14 than rustc - C++ is 3x faster. With LLVM-15 they are much closer.
When compared with the same LLVM version clang much better utilised LLVM-14 than rustc - C++ is 3x faster. With LLVM-15 they are much closer.