Abstract
This paper describes the structure of a code generator formed by merging the best aspects of three code generation techniques: Graham-Glanville parser-driven code generation [G] [GG] [GR] [HG], the register allocation/spill mechanism from the Portable C Compiler [J], and a code template expander [W]. The Graham-Glanville method was modified to use a standard LALR parser and table builder, and the register allocation method was extended in several significant ways in order to make optimal use of a machine with characterized registers.This code generator is a part of the Pascal-86 compiler developed by Intel Corporation as one of several compilers supporting its iAPX-86 (8086) microprocessor family. The language supported by the compiler is an extension of the Draft International Standard Pascal, level 0. Object code generated by this method compares favorably to code produced by other compilers for the 8086, as well as Pascal compilers for other machines. Since its release in March 1981, the code generator has proved to be quite reliable and easy to maintain.
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