apache/spark — pull request #3577 by dbtsai (2014-12-03 08:46:13+00:00)
Title: [SPARK-4717][MLlib] Optimize BLAS library to avoid de-reference multiple times in loop

Have a local reference to `values` and `indices` array in the `Vector` object
so JVM can locate the value with one operation call. See `SPARK-4581`
for similar optimization, and the bytecode analysis.