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  1. .bp
  2. .NH 1
  3. Register Allocation
  4. .NH 2
  5. Introduction
  6. .PP
  7. The efficient usage of the general purpose registers
  8. of the target machine plays a key role in any optimizing compiler.
  9. This subject, often referred to as \fIRegister Allocation\fR,
  10. has great impact on both the code generator and the
  11. optimizing part of such a compiler.
  12. The code generator needs registers for at least the evaluation of
  13. arithmetic expressions;
  14. the optimizer uses the registers to decrease the access costs
  15. of frequently used entities (such as variables).
  16. The design of an optimizing compiler must pay great
  17. attention to the cooperation of optimization, register allocation
  18. and code generation.
  19. .PP
  20. Register allocation has received much attention in literature (see
  21. .[
  22. leverett register allocation compilers
  23. .]
  24. .[
  25. chaitin register coloring
  26. .]
  27. .[
  28. freiburghouse usage counts
  29. .]
  30. and
  31. .[~[
  32. sites register
  33. .]]).