5 ms·
REP OUTSW writes to an I/O port. Duff's device writes to memory-mapped I/O. It's not the same thing.
by cesarb 9y ago
REP OUTSW writes to an I/O port. Duff's device writes to memory-mapped I/O. It's not the same thing.
- desertrider12 9y agox86 can still do this. It has STOS (read next byte/word), LODS (memset), and MOVS (memcpy).