Add AVX2-accelerated decoder #5
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mm256_shuffle_epi8 isn't in stdsimd, so let's work around it with some inline assembly until it is.
Performs what was previously a 64+ instruction scalar load in a little over 16 instructions. This doesn't yield the same speedup I was hoping for, but hopefully it'll be more noticeable once the encoder is vectorized as well.
Remove the unnecessary division and modulus in the encoding algorithm. I may need to find a way around the u8->u16->u8 cast as well.
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Yields a 25%+ speedup on decoder-limited workflows. This means base💯 is now nearly twice as fast as base64 in many scenarios.