Pre-selection Optimization for Spill Heuristic on Shenwei Platform

The C2 just-in-time compiler implemented on the SWJDK allocates registers according to the graph coloring register allocation algorithm.The just-in-time compiler ignores the characteristics of the SW processor when allocating registers,which results in excessive memory access codes.In order toget the most out of SW processor,this paper proposes a compilation optimization algorithm.The optimization algorithm is based on the graph coloring register allocation algorithm.And the spill strategy is adjusted based on a priori assumptions about the characteristics of registers representing special information on the SW server.The proposed algorithm has been implemented in SWJDK.The optimization of the algorithm also has been verified based on the benchmark SPECjbb2015 and SPECjvm2008.After optimization,the max-jOPS of SPECjbb2015 increases by 4.20% and critical-jOPS of SPECjbb2015 increases by 5.98%.The SPECjvm2008 increases by 2.02%。