Information processing apparatus and compiling method

An information processing system comprising:

• a memory;
• a nonvolatile storage device configured to store a program for accessing an entity of a variable stored in a variable-storage region in the memory by using either a first or second memory address, both the first and second memory addresses being allocated to the variable-storage region;
• a processor configured to load the program into the memory and to execute the program loaded in the memory;
• a cache configured to store data items stored in the memory;
• and
• a cache controller configured to access either the memory or the cache by using a memory address designating the variable-storage region, in accordance with either the first or second memory address in a memory access request from the processor.

A compile method of generating a program to be executed in an information processing apparatus configured to read and write in a cache-off mode where write access of a write-through scheme is allowed and reading data from a cache is prohibited when a memory address in a memory access request from a processor is a first memory address, and to read and write in a cache-on mode where write access of the write-back scheme is allowed and reading data from the cache is allowed when the memory address in the memory access request is the second memory address, the method comprising:

• detecting a first module instructing read or write access to the first memory address and a second module instructing read or write access to the second memory address from a program configured to access an entity of a variable stored in a memory by using either a first or second variable name assigned to the first or second memory address, respectively;
• replacing a value to be read by the second module with a new value to be read or written by a previous module when the second module is detected, if the detected second module is for reading data and the previous module that precedes the detected second module is the first module;
• and
• optimizing by deleting modules not to be used from the program on the basis of the new value.