| 摘要 |
PROBLEM TO BE SOLVED: To reduce an instruction size by executing a flag control instruction that is an instruction of some sort based on a flag group in a short instruction length of byte, in an instruction size reduction device. SOLUTION: The instruction size reduction device includes: a CPU 1; a memory 2 storing an instruction of the CPU 1; and a flag group storage means 4 storing two or more flags. The instruction size reduction device also includes a flag limitation means 7 limiting and selecting a specific flag from a flag group in the flag group storage means 4. The CPU 1 inputs the flag limited and selected by the flag limitation means 7, and executes an instruction based on information of the specific flag. By controlling the flag limitation means 7, a limitation flag group 9 obtained by selecting the flags of the flag group storage means 4 is created, and the number of the flags entering the CPU 1 is restricted. COPYRIGHT: (C)2011,JPO&INPIT
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