simdnbt

an unnecessarily fast nbt decoder. like seriously you probably don't need this unless you're trying to win benchmarks.

simdnbt currently makes use of simd instructions for two things:

• swapping the endianness of int arrays
• checking if a string is plain ascii for faster mutf8 to utf8 conversion

simdnbt might be the fastest nbt decoder currently in existence. however to achieve this silly speed, it takes a couple of shortcuts:

1. it requires a reference to the original data (to avoid cloning)
2. it doesn't validate/decode the mutf-8 strings at decode-time

here's a benchmark comparing simdnbt against a few of the other fastest nbt crates (though without actually accessing the data):

and here's a benchmark where it accesses the data and makes it owned: