https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100411
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-11 branch has been updated by Eric Botcazou <ebotca...@gcc.gnu.org>: https://gcc.gnu.org/g:dcb23f439f3cf5601fb8bf49889accd16f3b30a1 commit r11-8354-gdcb23f439f3cf5601fb8bf49889accd16f3b30a1 Author: Eric Botcazou <ebotca...@adacore.com> Date: Wed May 5 16:50:55 2021 +0200 Fix PR rtl-optimization/100411 This is the bootstrap failure of GCC 11 on MinGW64 configured with --enable- tune=nocona. The bottom line is that SEH does not support CFI for epilogues but the x86 back-end nevertheless attaches it to instructions, so we have to filter it out and this is done by detecting the end of the prologue by means of the NOTE_INSN_PROLOGUE_END note. But the compiler manages to generate a second epilogue before this note in the RTL stream and this fools the aforementioned logic. The root cause is cross-jumping, which inserts a jump before the end of the prologue, in fact just before the note; the rest (CFG cleanup, BB reordering, etc) is downhill from there. gcc/ PR rtl-optimization/100411 * cfgcleanup.c (try_crossjump_to_edge): Also skip end of prologue and beginning of function markers.
