about the third column

[Yu Neil]

hello:

  while i face a "can't find a register in class ?? while reloading asm", i 
usuall use "//" to comment the third column of asm statement, it's runs ok, 
so I want say is the third column of asm statement is neccssary ? or it's a 
history caused, bec I think the register collision detection should handled 
by compiler but no people/

allen

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