http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60926
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> --- > pushq %rbp > movq %rsp, %rbp > subq $8, %rsp ; why 8? Because the pushq increments rsp by 8 so adding another 8 will cause it to be full addition of 16.