https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65145
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Fri, 20 Feb 2015, alexey.lapshin at oracle dot com wrote: > The size of atomic object does not match with documentation - > https://gcc.gnu.org/wiki/Atomic/GCCMM/UnalignedPolicy specifically : That's not documentation. It's an early description of intent that does not correspond to what was actually implemented (note the future tense in the words you quote, and the last edited date a year before I added _Atomic support to trunk based on Andrew's work). In general, old wiki pages are left around as they may help understand archived development discussions.