https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112565
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- GCC can interleave instructions belonging to different source lines so that's what you see. Since you advance assembler instructions I don't see a way to "improve" things here when optimizing.