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XPL A small dialect of PL/I used for compiler writing from Stanford, 1967-69. XPL has one-dimensional arrays. I/O is achieved with character pseudo-variable INPUT and OUTPUT, e.g. OUTPUT = 'This is a line';
It has inline machine code. "Programmers are given all the rope they ask for. Novices tend to hang themselves fairly frequently." XPL has been implemented on IBM 360, {Univac 1100}, {ICL System 4}, {CDC 6000} and Cyber series, {XDS Sigma-5} and {Sigma-7} and DEC PDP-10. An optimising XPL compiler (version 1) by Robin Vowels is a standard implementation of XPL and is based on McKeeman, Horning, and Wortman's improved {XCOM} (which employs hashed symbol table generation). It includes the extra built-in function COREHALFWORD. The following areas have been optimised: procedures calls when the argument and corresponding parameter are of the same type, and when the argument is a constant; constant subscripts; use of CORELHALFWOR
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