This book is a reference for the programmer using the IBM PL/I compiler. It is not a tutorial, but is designed for the reader who already has a knowledge of the PL/I language and who requires reference information needed to write a program for an IBM PL/I compiler. It contains guidance information and general-use programming interfaces.

Because this book is a reference manual, it is not intended to be read from front to back, and terms can be used before they are defined. Terms are highlighted where they are defined in the book, and definitions are found in the glossary.

Improved performance

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The compiler now handles even more conversions by generating inline code which means these conversions will be done much faster than previously. Also, all conversions done by library call are now flagged by the compiler.
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The compiler-generated code now uses, in various situations, less stack storage.
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The compiler now generates much better code for references to the TRANSLATE built-in function.
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The compiler-generated code for SUBSCRIPTRANGE checking is now, for arrays with known bounds, twice as fast as before.
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The ARCH and TUNE options now support 4 as a suboption, thereby allowing exploitation of instructions new to the zSeries machines.
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ARCH(2), FLOAT(AFP) and TUNE(3) are now the default.

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