Provides effective use of architecture-specific instructions. There is provided a compiler including: a target partial program detecting unit for detecting, from among a partial programs of the program to be optimized, a partial program including instructions corresponding to all instructions included in the pattern to be replaced as a partial program to be optimized; an instruction sequence transforming unit for transforming, in the partial program to be optimized, instructions other than those instructions corresponding to instructions included in the pattern to be replaced and those instructions having execution dependencies different from the pattern to be replaced, so that dependencies between instructions included in the partial program to be optimized match the pattern to be replaced; an instruction sequence replacing unit for replacing the partial program to be optimized transformed by the instruction sequence transforming unit with a target instruction sequence determined in accordance with the pattern to be replaced.

 
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