register allocation

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register allocation

(compiler, algorithm)
The phase of a compiler that determines which values will be placed in registers. Register allocation may be combined with register assignment.

This problem can be shown to be isomorphic to graph colouring by relating values to nodes in the graph and registers to colours. Values (nodes) which must be valid simultaneously are linked by edges and cannot be stored in the same register (coloured the same).

See also register dancing and register spilling.

[Preston Briggs, PhD thesis, Rice University, April 1992 "Register Allocation via Graph Coloring"].
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This can lead to sub-optimal register allocation and pointer assignments, redundant code and inconsistent variable declarations.
Andrew Cambridge University Press 2002 ISBN 0-521-82060- This textbook describes all phases of a compiler: lexical analysis, parsing, abstract syntax, semantic actions, intermediate representations, instruction selection via tree matching, dataflow analysis, graph-coloring register allocation, and runtime systems.
The task of register allocation is to map virtual registers (e.
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Graph-coloring global register allocation and targeting, which have been implemented by Lal George [1994; 1996], will accomplish most control transfers (function calls) (such as line 12 and 13 in Figure 7) without any register-register moves.
A Simple Interprocedural Register Allocation Algorithm and Its
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New contributors provide additional insight to chapters on register allocation, software pipelining, instruction scheduling, and type systems.