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x86/x86-64 assemblers don't support -mtune/-march/-mcpu.
We need a switch to tell assembler if the new nop instructions can be used at all. Secondly, not all modern processors prefer "long" versions. We need another switch to tell which kind of the new nop instructions should be used, short or long.
Maybe I should add -march= and -mtune= to assembler.
Cheers Nick
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