Commits on Sep 21, 2023

1. Replace xxh64 with a simplified version …

   This function gives the same result as regular xxh64(), but the difference
   is that it only works on single 64-bit values.
   
   Mostly the "bit mixing" part of xxh64 (functions finalize()/avalanche()) is
   left.
   
   This performs a little bit better than calling the original function on an
   8-byte slice because the compiler does not fully inline everything
   (finalize() remains a function call).
   
   This speeds up index generation by a couple of percent.

   

   marcelm committed Sep 21, 2023
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