Olivier Houchard 9acb0e651b In atomic_fetchadd_32(), do not blindly increase the value of %3.
It should just contain the value we want to add, as if we're interrupted
between the add and the str, we will restart from the beginning. Just use
a register we can scratch instead.

MFC After:	1 week
2007-11-27 22:12:05 +00:00
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