As part of an effort to design and implement a Fortran compiler on the ILLIAC IV, an extended Fortran, called IVTRAN, has been developed. This language provides a means of expressing data and control structures suitable for exploiting ILLIAC IV parallelism. Tbis paper reviews the bardware cbaracteristics of tbe ILLIAC and singles out unconventiona features which could be expected to influence langluage (and compiler) design. Tbe implications of (bese features for data layout and algoritbm structure are discussed, and tbe eonelusion is drawn tbat data allocation ratber tban code structuring is tbe crucial ILLIAC optimization problem. A satisfactory metbod of data allocation is tben presented. Language structures to utilize this storage method and express parallel algorithms are described.
This paper provides a basic description of a FORTRAN system for the ILLIAC IV. In this context “FORTRAN system” means exactly what one would expect — a user familiar with a different system will find no major surprises when he uses ILLIAC FORTRAN. The language is the same — a dialect of ANSI standard FORTRAN. The processors are the same — a compiler which generates relocatable binary files from FORTRAN source text, a link editor which collects and joins separately compiled program pieces into a single module, a loader which loads and relocates a single module into ILLIAC memory, a library of functions, and an I/O subsystem which supports formatted and unformatted FORTRAN I/O.
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