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|Designed by||James McGraw|
|Developer||James McGraw et al., at University of Manchester, LLNL, Colorado State University, and DEC|
|Typing discipline||static, strong|
|VAL, Pascal, C, Fortran|
|Haskell, SAC|
SISAL ("Streams and Iteration in a Single Assignment Language") is a general-purpose single assignment functional programming language with strict semantics, implicit parallelism, and efficient array handling. SISAL outputs a dataflow graph in Intermediary Form 1 (IF1). It was derived from VAL (Value-oriented Algorithmic Language, designed by Jack Dennis), and adds recursion and finite streams. It has a Pascal-like syntax and was designed to be a common high-level language for numerical programs on a variety of multiprocessors.
SISAL was defined in 1983 by James McGraw et al., at the University of Manchester, LLNL, Colorado State University and DEC. It was revised in 1985, and the first compiled implementation was made in 1986. Its performance is superior to C and rivals Fortran, according to some sources, combined with efficient and automatic parallelization.
SISAL's name came from grepping "sal" for "Single Assignment Language" from the Unix dictionary /usr/dict/words.
SISAL is more than just a dataflow and fine-grain language. It is a set of tools that convert a textual human readable dataflow language into a graph format (named IF1 - Intermediary Form 1). Part of the SISAL project also involved converting this graph format into runable C code.
SISAL Renaissance Era
In 2018 SISAL got modernized with indent-based syntax, first-class functions, lambdas, closures and lazy semantics within a project SISAL-IS.
- Retire Fortran?: a debate rekindled, David Cann, August 1992, Communications of the ACM, Volume 35, Issue 8
- SISAL Parallel Programming SourceForge.net project page