https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84280
Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |NEW CC| |aoliva at gcc dot gnu.org, | |marxin at gcc dot gnu.org --- Comment #15 from Martin Liška <marxin at gcc dot gnu.org> --- I can confirm that on my Haswell machine: model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz I see regression with -march=core2 -mtune=core2 -O3 starting from r226901 (first time in GCC 5.x). Time difference is: 0:00:14.975390 vs 0:00:11.889274