jpountz commented on PR #15104:
URL: https://github.com/apache/lucene/pull/15104#issuecomment-3210633354

   cc @rmuir who made me find this bug by observing that naive decoding and 
optimized decoding performed the same
   
   @uschindler I'm not sure why but I'm getting much worse performance since 
#15089 (I get ~10.4 ops/us before this PR):
   
   ```
   Benchmark                                                          (size)   
Mode  Cnt  Score   Error   Units
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVInt              64  
thrpt    5  0.624 ± 0.010  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVIntBaseline      64  
thrpt    5  6.833 ± 0.080  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readVInt                   64  
thrpt    5  8.976 ± 0.270  ops/us
   ```


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