By Sam F. Mendicino, Robert A. Hughes, Jeanne T. Martin, Frank H. McMahon, John E. Ranelletti, Richard G. Zwakenberg
Communications of the ACM,
Vol. 11 No. 11, Pages 747-755
Extensive software problems confront an organization which possesses a number of different computers and which frequently acquire new ones. To maintain cohesion, a system must be developed, written in a high level language, which minimizes machine dependencies and isolates those which are necessary. A language and a compiler for that language are discussed here.
The language, called LRLTRAN, is a heavily augmented FORTRAN. The three-pass compiler makes use internally of a postfix Polish notation (pass I to pass II) and a free representation referred to as a “composite blocking table” (pass I to pass III). Machine-independent optimization occurs in pass II and DO-loop and machine-dependent optimization in pass III.
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