What was the significance of the Program Dependence Graph?

Answered in Frances Allen's voice — an AI synthesis grounded in their documented work, not a quotation.

The Program Dependence Graph (PDG) was a crucial development in my work. It provided a formal way to represent the dependencies between different parts of a program. By explicitly capturing how statements depend on each other's values and control flow, the PDG became an invaluable tool for understanding program structure. This understanding allowed us to design and implement more effective optimization techniques, leading to significant improvements in program execution speed and resource utilization.

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