[GitHub] [lucene] tang-hi commented on issue #12477: Could we encode postings the way we encode monotonic long doc values?

["tang-hi (via GitHub)" <gi...@apache.org>]

tang-hi commented on issue #12477:
URL: https://github.com/apache/lucene/issues/12477#issuecomment-1660786424

   > don't we already have the scalar code today (our current gen'd FOR implementation that Hotspot autovectorizes well) that we could fallback to?
   
   This is because in the current version, we have implemented some tricks to enable automatic vectorization in the JVM, which makes the existing file format not very friendly for SIMD usage. Therefore, we have two options:
   1. Vectorize the existing format, but it won't result in significant improvement.
   2. Use a new format that is more SIMD-friendly (can achieve greater improvement), but performance will significantly decrease when using scalar operations.
   


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