https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66631
--- Comment #1 from Stas Sergeev <stsp at users dot sourceforge.net> --- Please note that the shown code was generated with gcc-4.8.2, but inability to clobber segreg with inline asm was tested with gcc-5.1.1. A bit of dissonance here, I can't do both tests with similar gcc. Is there some magic -mno-xxx option that will prevent gcc from moving the addr caclulus too far away from the access to the volatile var?
