Comment by exDM69

> Rust has native SIMD support

std::simd is nightly only.

> while in standard C there is no way to express that.

In ISO Standard C(++) there's no SIMD.

But in practice C vector extensions are available in Clang and GCC which are very similar to Rust std::simd (can use normal arithmetic operations).

Unless you're talking about CPU specific intrinsics, which are available to in both languages (core::arch intrinsics vs. xmmintrin.h) in all big compilers.