GCC Status Report (2004-03-09)

[Richard Kenner]

    In practice, though, there has been a more liberal use of this /u flag 
    because putting it on several writes to the same memory location doesn't 
    seem to cause any problem as long as every write to the said location 
    carries the /u flag (because the memory writes then conflict).

No, I don't think that's right.  I'm pretty sure that there is some
code someplace that will fail if there are two writes to the same /u location
and I thought we added code to prevent any such.