rmuir commented on PR #14896:
URL: https://github.com/apache/lucene/pull/14896#issuecomment-3040584913

   sorry, due to holiday weekend in my country i have not had a chance to look 
at this yet.
   
   I don't think the 256-bit check is correct, although it might "happen to 
work" to prevent the code from executing when only 128-bit NEON is available. 
Most likely the problem you see on arm is that you need UseSVE for the vector 
compress() here. At a glance, it seems all support is guarded by SVE:
   
   
https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/aarch64/aarch64_vector.ad#L7007-L7093
   
   


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