Snappy Team d261d2766f Optimize zippy MemCpy / MemMove during decompression ...

By default MemCpy() / MemMove() always copies 64 bytes in DecompressBranchless().  Profiling shows that the vast majority of the time we need to copy many fewer bytes (typically <= 16 bytes).  It is safe to copy fewer bytes as long as we exceed len.

This change improves throughput by ~12% on ARM, ~35% on AMD Milan, and ~7% on Intel Cascade Lake.

PiperOrigin-RevId: 453917840

2022-07-27 15:27:58 +00:00

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