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How does CPU differentiate REP and REPE instructions?

user3445165 Published at Dev
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user3445165

According to this manual, REP and REPE instructions have different behaviour, but the same opcode F3.

How does CPU differentiate this two commands, if they both have the same opcode?

Pascal Cuoq

REP and REPE are prefixes, not instructions. Some instructions accept the REPE prefix. Others accept REP. The ISA was designed so that no instruction accepts both, so the problem does not arise.

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