[HIVE-11521] Loop optimization for SIMD in logical operators

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Assignee: Teddy Choi
• Reporter: Teddy Choi
• Created: 11/Aug/15 13:54
• Updated: 16/Feb/16 23:52
• Resolved: 24/Aug/15 17:28

Description

JVM is quite strict on the code schema which may executed with SIMD instructions, take a loop in ColOrCol.java for example,

for (int i = 0; i != n; i++) {
  outputVector[i] = vector1[0] | vector2[i];
}

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.