Abstract: A program re-writing method which re-writes an inputted program into a program for a processor for controlling whether or not a process is executed based on a yes or no execution flag, said program re-writing method including: inserting a comparison process into the inputted program, the comparison process comparing first address information, which is memory address information accessed by a first memory access process included in the inputted program, and second address information, which is address information of a memory accessed by a second memory access process included in the inputted program, and writing a comparison result into the yes or no execution flag; and inserting a yes or no execution flag-attached logic preservation process into the inputted program, the yes or no execution flag-attached logic preservation process being a process executed based on a value of the yes or no execution flag and preserving the same result as a result of the inputted program when executed.

Abstract: An analysis section analyzes the live range of a first variable shared among subroutines and the live range of a second variable used only in a subroutine. The allocation section allocates the second variable in an allocation memory for the first variable if the live ranges of the first and second variables do not overlap each other.

Abstract: A program re-writing method which re-writes an inputted program into a program for a processor for controlling whether or not a process is executed based on a yes or no execution flag, said program re-writing method including: inserting a comparison process into the inputted program, the comparison process comparing first address information, which is memory address information accessed by a first memory access process included in the inputted program, and second address information, which is address information of a memory accessed by a second memory access process included in the inputted program, and writing a comparison result into the yes or no execution flag; and inserting a yes or no execution flag-attached logic preservation process into the inputted program, the yes or no execution flag-attached logic preservation process being a process executed based on a value of the yes or no execution flag and preserving the same result as a result of the inputted program when executed.