| Abstract: | Abstract machine modelling is a popular technique for developing portable compilers. A compiler can be quickly realized by translating the abstract machine operations to target machine operations. The problem with these compilers is that they trade execution efficiency for portability. Typically, the code emitted by these compilers runs two to three times slower than the code generated by compilers that employ sophisticated code generators. This paper describes a C compiler that uses abstract machine modelling to achieve portability. The emitted target machine code is improved by a simple, classical rule-directed peephole optimizer. Our experiments with this compiler on four machines show that a small number of very general handwritten patterns (under 40) yields code that is comparable to the code from compilers that use more sophisticated code generators. As an added bonus, compilation time on some machines is reduced by 10 to 20 per cent. |
