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Teddy Choi commented on HIVE-11521: ----------------------------------- [~Ferd] I see. I will try some benchmark test at GB~TB scale in some day to see real performance improvements. Thanks. > Loop optimization for SIMD in logical operators > ----------------------------------------------- > > Key: HIVE-11521 > URL: https://issues.apache.org/jira/browse/HIVE-11521 > Project: Hive > Issue Type: Sub-task > Reporter: Teddy Choi > Assignee: Teddy Choi > Priority: Minor > Attachments: HIVE-11521.patch > > > JVM is quite strict on the code schema which may executed with SIMD > instructions, take a loop in ColOrCol.java for example, > {code} > for (int i = 0; i != n; i++) { > outputVector[i] = vector1[0] | vector2[i]; > } > {code} > The "vector1\[0\]" reference would prevent JVM to execute this part of code > with vectorized instructions, we need to assign the "vector1\[0\]" to a > variable outside of loop, and use that variable in loop. > This issues covers AND, OR, NOT logical operators. -- This message was sent by Atlassian JIRA (v6.3.4#6332)