Benedict created CASSANDRA-15215:

             Summary: VIntCoding should read and write more efficiently
                 Key: CASSANDRA-15215
             Project: Cassandra
          Issue Type: Bug
          Components: Local/Compaction, Local/SSTable
            Reporter: Benedict

Most vints occupy significantly fewer than 8 bytes, and most buffers have >= 8 
bytes spare, in which case we can construct the relevant bytes in a register 
and memcpy them to the correct position.  Since we read and write a lot of 
vints, this waste is probably measurable, particularly during compaction and 
flush, and can probably be considered a performance bug.

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