METHOD, PROGRAM, AND SYSTEM FOR CODE OPTIMIZATION

摘要

Method, program and system for code optimization. The method includes detecting a sign assignment instruction having an input operand and an output operand identical in size to each other. Analyzing and determining whether a value of the input operand results from an add or subtract operation and if the value is greater than the value prior to the operation. If so then removing the sign assignment instruction on the condition that the input operand and the output operand of the sign assignment instruction have their addresses identical to each other and replacing the sign assignment instruction with a copy instruction for copying the value of the input operand of the sign assignment instruction to a value of the output operand on the condition that the addresses of the input operand and the output operand of the sign assignment instruction are not identical and do not overlap each other.