Abstract

Past register allocators have applied heuristics to allocate registers at the local, global, and interprocedural levels. This paper presents a polynomial time interprocedural register allocator that models the cost of allocating registers to procedures and spilling registers across calls. To find the minimum cost allocation, our allocator maps solutions from a dual network flow problem that can be solved in polynomial time. Experiments show that our interprocedural register allocator can yield significant improvements in execution time. 1 Introduction Effectively using registers can significantly decrease the execution time of a program. Common policy in current compilers using only intraprocedural register allocation is to spill at call sites registers that might be used by both the caller and callee[CHKW86]. The goal of interprocedural register allocation is to minimize execution time given the register requirements of individual procedures in a program. Based on these requirements...

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