https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66925
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Some processors moving between the GPR via vmovd is slower than moving via memory. So that is the reason why using -march=sandybridge or -march=ivybridge makes the issue go away.