Recompilation of computer programs for enhanced optimization

Details Recompilation of computer programs for enhanced optimization Recompilation of computer programs for enhanced optimization

G - Physics

06

F

G06F 9/44 (2006.01) G06F 9/45 (2006.01)

Patent

CA 2102089

An optimising compiler for producing executable programs from code, high level languages compiles the code whilst generating data from which a callgraph may be constructed, and then recompiles the procedures identified in the callgraph in an order which reverses the topology of the callgraph while monitoring usage of hardware registers. Procedures which are rarely or never called, or result in termination of the program, are identified, and are modified if needed so that if called, registers which they may modify are saved prior to execution of the procedure and subsequently restored if necessary, so that in a calling procedure, subsequently recompiled, no account need be taken of possible register usage by the called procedure. This makes additional registers available to the calling procedure, and enables register storing and restoring which must otherwise be associated with the callsite to be eliminated.

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