Abstract
This paper proposes a new integration technique, called IRIS (Integrated Register allocation and Instruction Scheduling), to combine instruction scheduling and register allocation. Both register allocation and instruction scheduling are performed simultaneously at each variable reference where the selection between serialization by scheduling and spilling by register allocation is determined. To make a right selection, the costs of serialization and spilling are estimated with a cost model proposed to reduce the complexity of the estimation. Experiments show that IRIS achieves significant improvements when compared to widely-used existing techniques.
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