International Business Machines Corporation

Patrick Todd Haugen

Robert Ralph Roediger

Robert John Donovan

Mikko Herman Lipasti

Tim Clayton Muehe

Mark Jonathon Hessler

Keith Vernon Besaw

A method, apparatus and article of manufacture for performing alias refinement is disclosed. Initially, a determination is made as to whether a load of an address exists for a variable in an intermediate representation of the source code. If a load of the address exists for the variable, a further determination is made whether each use of the address is for an indirect reference of the variable. If a particular use of the address is for an indirect reference of the variable, the indirect reference is replaced with a direct reference in the intermediate representation. If all uses of the address are for an indirect reference of the variable, the variable is removed from an alias set used with the intermediate representation.

Method and apparatus for refining an alias set of address taken variables

A method and apparatus allows a compiler to optimize code in the presence of exception handlers. According to a first embodiment, arcs are added to a control flow graph, prior to performing global optimizations, to account for exception handling code. According to the second embodiment, information relating to control flow to exception handlers is provided in pseudo-references in the code, which allows the compiler to determine how to appropriately optimize the code.

Method and apparatus for enabling global compiler optimizations in the

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Altura, MN, United States of America

Patrick Todd Haugen