alt Hacker Newssimilarly IIRC, on (some generations of) x86 chips, NOP is sugar around `XCHG EAX, EAX` which is effectively a do-nothing operation
similarly IIRC, on (some generations of) x86 chips, NOP is sugar around `XCHG EAX, EAX` which is effectively a do-nothing operation
This is pretty much all x86 chips as far as I'm aware: opcode 0x90 which is equivalent to XCHG AX,AX.
The 8080 and Z80's NOP was at opcode 0. Which was neat because you could make a "NOP slide" simply by zeroing out memory.