I need to do lots of calculations with big decimals and I found bigdecimal - Rust which is ok but I was wondering if there's a library that does the same thing but using x86's vector instructions (SIMD) or ARM's equivalent to do up to 8 floating point multiplications at a time instead of one.
Is there a de facto library for number crunching in Rust, specially for when you need big decimals?
I would try the crate rug. It uses some very fast and well optimized C libraries.
unfortunately the license is not a fit for my needs 
Both stdarch(std::arch) and packed_simd provide a number of simd APIs. But I'm not sure if there is a big-decimal-calculation crate based on them.
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