Timothy A Cramer

US Patent:

51074184, Apr 21, 1992

Filed:

Aug 23, 1990

Appl. No.:

7/571503

Inventors:

Timothy J. Cramer - Pleasanton CA
David M. Cox - Livermore CA

Assignee:

Supercomputer Systems Limited Partnership - Eau Claire WI

International Classification:

G06F 944

US Classification:

395700

Abstract:

A method for representing scalar data dependencies for an optimizing compiler wherein a global scalar data dependence graph is created to represent all of the scalar objects in an entire program. The scalar data dependencies are represented as three chains: a use-definition chain (ud); a definition-use chain (du) or a definition-definition chain (dd), and is created for the entire program and is maintained during the entire compilation or assembly of the program. The method for determining scalar data dependences for the entire program starts by analyzing the scalar data dependences within each basic block, in a single pass, processes all definitions and uses of all non-array data objects in the basic block, including simple variables and complex data objects such as records, unions, pointers and procedure calls in the presence of aliasing. From these objects, information is collected, such as whether the data objects are upwardly or downwardly exposed, pointers, pointer aliases, aggregate objects, array objects, uses, definitions; whether they are calls, indirect uses, or indirect definitions.

US Patent:

51758563, Dec 29, 1992

Filed:

Aug 23, 1990

Appl. No.:

7/572043

Inventors:

Don A. Van Dyke - Pleasanton CA
Timothy J. Cramer - Pleasanton CA
James C. Rasbold - Livermore CA
Kelly T. O'Hair - Livermore CA
David M. Cox - Livermore CA
David A. Seberger - Livermore CA
Linda J. O'Gara - Livermore CA
Jon A. Masamitsu - Livermore CA
Robert E. Strout - Livermore CA
Ashok Chandramouli - Fremont CA

Assignee:

Supercomputer Systems Limited Partnership - Eau Claire WI

International Classification:

G06F 1516

US Classification:

395700

Abstract:

A modular compilation system that utilizes a fully integrated hierarchical representation as a common intermediate representation to compile source code programs written in one or more procedural programming languages into an executable object code file. The structure of the integrated common intermediate representation supports machine-independent optimizations, as well as machine-dependent optimizations, and also supports source-level debugging of the executable object code file. The integrated hierarchical representation (IHR) is language independent and is shared by all of the components of the software development system, including the debugger.