Samuel Thibault wrote: > Samuel Thibault, le Wed 23 Dec 2009 10:26:09 +0100, a écrit : >> Da Zheng, le Wed 23 Dec 2009 16:46:34 +0800, a écrit : >>>> If you use volatile, the compiler won't >>>> optimise instructions so it would "work" too ; note however that it's >>>> not SMP safe (it may even not be premption-safe, depending on which >>>> instruction the compiler eventually uses). >>> We don't need both? If there is only volatile, instructions might be >>> executed out of order and compilers might also reorder instructions. >> Volatile prevents from compiler reorder. > > Oops, sorry, of course not. You need the memory clobber for that. Or use > a function call and not assume that ordering will be correct for local > variables. That's what I expect.
Zheng Da
