http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53710
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-06-17 18:35:28 UTC --- There is no problem on processors where -march=native gives -march=corei7-avx -mcx16 -msahf -mno-movbe -maes -mpclmul -mpopcnt -mno-abm -mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mavx -mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rtm -mno-hle -mrdrnd -mf16c -mfsgsbase
