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Register allocation is an important component of most compilers, particularly those for RISC machines. The SPUR Lisp compiler uses a sophisticated, graph-coloring algorithm developed by Fredrick Chow [Chow84]. This paper describes the algorithm and the techniques used to implement it efficiently and evaluates its performance on several large programs. The allocator successfully assigned most temporaries and local variables to registers in a wide variety of functions. Its execution cost is moderate.
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