INCREMENTAL INTERPROCEDURAL DATAFLOW ANALYSIS DURING COMPILATION

Instead of performing local dataflow analyses on all procedures during a multi-file optimized code generation, those dataflow analyses are done only on a generally much smaller set of procedures that were actually impacted by source code edits. Incremental inter-procedural dataflow analysis (IIPDA) code identifies a set of procedures to be recompiled due to impact from one or more edits and does local dataflow analyses only on them. Results of the incremental approach for use in generating optimized code match the results of a more expensive exhaustive interprocedural dataflow analysis of all procedures, even when call graph structure has been changed by the edits. The impacted procedures are identified based on which procedures were edited, dataflow values, intermediate language representations, and a portion of the call graph.