Andi Kleen wrote:
Thanks for pointing this out. 0x90 is also the opcode for xchg r8,rAX
instruction.

But nop doesn't actually need to execute exchange.

The sequence 0x41 0x90 uses the 0x90 opcode but is not a nop.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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