Nice, thank you 30.01.2015 18:24 пользователь "Malte Vesper" < malte.ves...@postgrad.manchester.ac.uk> 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 <buyit...@gmail.com>: >> >>> Please check the assembly code to double confirm the GCC behavior. >>> Why will GCC change the order as what you mentioned? Only assembly code >>> can tell you. >>> >> It does not change at the moment. I think it can change it. >> >> 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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