Optimize swizzle_dyn on AVX-512 VBMI - #545
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Doubles the throughput on both Ice Lake and Zen4.
Improves latency on Ice Lake from 23 to 13 cycles, on Zen4 from 17 to 15 cycles.
Improves encoding performance of a toy base64 implementation on Zen4 by -20% (time) +25% (throughput), no change on decoding benchmark
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Use a faster formulation of swizzle_dyn_precise on AVX-512 VBMI.
Doubles the throughput on both Ice Lake and Zen4. Improves latency on Ice Lake from 23 to 13 cycles, on Zen4 from 17 to 15 cycles.
Improves encoding performance of a toy base64 implementation on Zen4 by -20% (time) +25% (throughput), no change on decoding benchmark.
Disassembly and measurements done on linebender/fearless_simd#276 similarly to #542 and #543