Chengxiang Li created HIVE-10180:
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Summary: Loop optimization in ColumnArithmeticColumn.txt
Key: HIVE-10180
URL: https://issues.apache.org/jira/browse/HIVE-10180
Project: Hive
Issue Type: Sub-task
Reporter: Chengxiang Li
Assignee: Chengxiang Li
Priority: Minor
JVM is quite strict on the code schema which may executed with SIMD
instructions, take a loop in DoubleColAddDoubleColumn.java for example,
{code:java}
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.
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