Nice, thank you
30.01.2015 18:24 пользователь "Malte Vesper" <malte.vesper@xxxxxxxxxxxxxxxxxxxxxxxxx> написал:
Spinlocks imply memory barriers as far as I am aware...
Read here: http://lxr.free-electrons.com/source/Documentation/memory-barriers.txt#L1634
On 30/01/15 14:20, Matwey V. Kornilov wrote:
2015-01-30 16:52 GMT+03:00 buyitian <buyitian@xxxxxxxxx>:
Please check the assembly code to double confirm the GCC behavior.It does not change at the moment. I think it can change it.
Why will GCC change the order as what you mentioned? Only assembly code can tell you.
Because from line
ret = hdl->count;
until line
return ret;
there is no access to either ret or hdl->count. So it is reasonable to
optimizer to think that their values are the same and eliminate
unneeded variable.
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