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I'm surprised he tested MSVC and Clang, and not GCC which usually generates faster code than those two.

Well, they are the two easily available compilers on Windows. And rustc vs clang should be the fair comparison as they both use llvm

When comparing Rust and C++ it makes sense to use Clang IMO, since both, the Rust compiler and Clang, are based on LLVM.

But nevertheless: I agree it would have been interesting to test with GCC as well.