Titlebook: An APL Compiler; Timothy Budd Book 1988 Springer-Verlag New York Inc. 1988 APL.compiler.functions.programming.programming language

EXPEL

Why A Compiler ?,imitive operations, among others. For this reason, many people have over time voiced the opinion that a compiler for the language was inherently impossible and that only an interpreter provided the necessary flexibility. One result of the APL compiler project described here is to cast a great deal o

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The Inferencing Pass,ns are optional, information concerning how a variable will be used must be inferred indirectly from an examination of the program text. Such information can be extremely beneficial. Consider the simple statement:.I←I+1.If the identifier I is known to be a scalar integer, considerably better code ca

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Code Generation Overview,ed by each function represented in the parse tree. Once this information has been gathered, it is the task of the code generator to translate the parse tree into an equivalent program in the target language (in this case, the language C) that will, when executed, produce the desired results.

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Simple Space Efficient Functions,unctions are characterized by the fact that individual elements of the result can be computed independently of each other, and the actions involved in this computation depend only upon the indices of the elements being computed, not upon the value of those elements. Not all APL functions are space e

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Further Space Efficient Functions,chapter we consider a larger class of space efficient functions, those for which the transformations on the indices can become more complex than the simple division that was required to implement outer product. In many of these functions, reduction for example, the determination of a single element

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Directed

Epilogue,y a compiler for a language with indeterminate data objects using demand driven evaluation techniques. Nevertheless, this is only a small part of any production quality programming system. The larger issues of integrating the methods presented here into the more familiar APL workspace environment ha

intangibility

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Introduction: Temperature and Some Comment on Work,vity--Improving Profit shows how to measure contributions toBusiness of all sizes have a problem: How do you know—in real time—whether you are earning the profit you need to grow or even just stay in business? And which products or services are doing the “heavy lifting” in contributing to profit? Fi

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