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Posted to dev@hive.apache.org by "Chengxiang Li (JIRA)" <ji...@apache.org> on 2015/04/07 08:15:12 UTC
[jira] [Created] (HIVE-10235) Loop optimization for SIMD in
ColumnDivideColumn.txt
Chengxiang Li created HIVE-10235:
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Summary: Loop optimization for SIMD in ColumnDivideColumn.txt
Key: HIVE-10235
URL: https://issues.apache.org/jira/browse/HIVE-10235
Project: Hive
Issue Type: Sub-task
Components: Vectorization
Affects Versions: 1.1.0
Reporter: Chengxiang Li
Assignee: Chengxiang Li
Priority: Minor
Found two loop which could be optimized for packed instruction set during execution.
1. hasDivBy0 depends on the result of last loop, which prevent the loop be executed vectorized.
{code:java}
for(int i = 0; i != n; i++) {
<OperandType2> denom = vector2[i];
outputVector[i] = vector1[0] <OperatorSymbol> denom;
hasDivBy0 = hasDivBy0 || (denom == 0);
}
{code}
2. same as HIVE-10180, vector2\[0\] reference provent JVM optimizing loop into packed instruction set.
{code:java}
for(int i = 0; i != n; i++) {
outputVector[i] = vector1[i] <OperatorSymbol> vector2[0];
}
{code}
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