https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30049
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Created attachment 55690 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55690&action=edit testcase [apinski@xeond2 upstream-gcc-git]$ ~/upstream-gcc/bin/gcc t.c -march=opteron -ffast-math -funroll-loops -ftree-vectorize -msse3 -O3 -g [apinski@xeond2 upstream-gcc-git]$ time ./a.out real 0m1.522s user 0m1.517s sys 0m0.001s [apinski@xeond2 upstream-gcc-git]$ ~/upstream-gcc/bin/gcc t.c -march=opteron -ffast-math -funroll-loops -ftree-vectorize -msse3 -O3 -g -DNORMAL_ARRAY [apinski@xeond2 upstream-gcc-git]$ time ./a.out real 0m0.356s user 0m0.352s sys 0m0.002s