easyice commented on issue #12826:
URL: https://github.com/apache/lucene/issues/12826#issuecomment-1824101886

   Thanks for explaining! you are right, if we call `DataInput.readVIntGroup`, 
the  function  `DataInput.readVIntGroupLong`(the same as 
`GroupVIntReader#readLong`) is not inlined, But if we switch to  
`readVIntGroupFully`,  the `DataInput.readVIntGroupLong` can be inlined.
   
   **baseline**, use `GroupVIntReader#readValues` , the 
`GroupVIntReader#readLong` is inlined:
   
![image](https://github.com/apache/lucene/assets/23521001/66706628-c3cf-43a4-81b5-4ce7433e045b)
   
   
   **approach_1**, switch to `DataInput.readVIntGroup`, the  
`DataInput.readVIntGroupLong` is NOT inlined:
   
![image](https://github.com/apache/lucene/assets/23521001/0a37c894-0de0-4b33-b0c5-864f73e8cf9a)
   
   
   **approach_2**, switch to `DataInput.readVIntGroupFully`, the  
`DataInput.readVIntGroupLong` is inlined:
   
![image](https://github.com/apache/lucene/assets/23521001/f1ab8850-decf-42e3-8bdd-ea0bee0270c5)
   


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