Teddy Choi created HIVE-11521:
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Summary: 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
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.
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