to an fu branch judgement circuit 307 through a signal line 212 and also loaded into a cc part 205 of the psw through the selector 204 concurrently with the above operation in the case where a bc instruction comes immediately after a gu cc change instruction the judgement unit decision circuit 306 sets a cc selection signal line 304 a gu judgement indication signal line 303 and an fu judgement indication signal line 305 to 34 0 34 34 1 34 and 34 0 34 respectively accordingly the cc from the gu cc creation circuit 202 is inputted to the gu branch judgement circuit 301 through the signal line 203 and the selector 309 while the gu branch judgement circuit 301 is activated by the gu judgement indication signal 303 and the result of gu branch judgement is sent to iu 3 through the signal line 302 in the case where the bc instruction comes immediately after an fu cc change instruction the judgement unit deciding circuit 306 sets the cc selection signal line 304 gu judgement indicating signal 303 and the fu judgement indication signal line 305 to 34 0 34 34 0 34 and 34 1 34 respectively thus the fu branch judgement circuit 307 is activated by the fu indication judgement signal line 305 a branch judgement is made by cc from the signal line 212 and the result of branch judgement is sent to iu 3 through the signal line 308 in the case where gu cc and fu cc change instructions do not exist immediately before the bc instruction the.