Program optimization method, and compiler using the same

摘要

An optimization method and apparatus for converting source code for a program written in a programming language into machine language. The program includes a basic block as a unit to estimate an execution time for the program to be processed, generating a nested tree that represents the connections of the basic blocks using a nesting structure, when a conditional branch is accompanied by a node in the nested tree, employing the execution time estimated by using the basic blocks as units to obtain an execution time at the node of the program when a conditional branching portion of a program is directly executed and when the conditional branching portion is executed in parallel, and defining the node as a parallel execution area group when the execution time required for the parallel execution is shorter or dividing multiple child nodes of the nodes into multiple parallel execution areas.