Chengxiang Li created HIVE-10235: ------------------------------------ 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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)