http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57927
--- Comment #2 from vincenzo Innocente <vincenzo.innocente at cern dot ch> --- COLLECT_GCC_OPTIONS='-S' '-O3' '-march=native' '-o' 'LU.native' '-v' '-shared-libgcc' /afs/cern.ch/user/i/innocent/w2/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/cc1plus -quiet -v -D_GNU_SOURCE LU.c -march=corei7-avx -mmmx -mno-3dnow -msse -msse2 -msse3 -mssse3 -mno-sse4a -mcx16 -msahf -mmovbe -maes -mpclmul -mpopcnt -mabm -mno-lwp -mfma -mno-fma4 -mno-xop -mbmi -mbmi2 -mno-tbm -mavx -mavx2 -msse4.2 -msse4.1 -mlzcnt -mno-rtm -mno-hle -mrdrnd -mf16c -mfsgsbase -mno-rdseed -mno-prfchw -mno-adx -mfxsr -mxsave -mxsaveopt --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=8192 -mtune=generic -quiet -dumpbase LU.c -auxbase-strip LU.native -O3 -version -o LU.native GNU C++ (GCC) version 4.9.0 20130718 (experimental) [trunk revision 201034] (x86_64-unknown-linux-gnu) versus COLLECT_GCC_OPTIONS='-S' '-O3' '-march=core-avx2' '-o' 'LU.avx2' '-v' '-shared-libgcc' /afs/cern.ch/user/i/innocent/w2/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/cc1plus -quiet -v -D_GNU_SOURCE LU.c -quiet -dumpbase LU.c -march=core-avx2 -auxbase-strip LU.avx2 -O3 -version -o LU.avx2 GNU C++ (GCC) version 4.9.0 20130718 (experimental) [trunk revision 201034] (x86_64-unknown-linux-gnu)
