https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98289
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:62cb9680e592057a49de66eac34da679338932f9 commit r11-6222-g62cb9680e592057a49de66eac34da679338932f9 Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Dec 17 13:28:48 2020 +0100 shrink-wrap: Don't put on incoming EDGE_CROSSING [PR98289] As mentioned in the PR, shrink-wrapping disqualifies for prologue placement basic blocks that have EDGE_CROSSING incoming edge. I don't see why that is necessary, those edges seem to be redirected just fine, both on x86_64 and powerpc64. In the former case, they are usually conditional jumps that patch_jump_insn can handle just fine, after all, they were previously crossing and will be crossing after the redirection too, just to a different label. And in the powerpc64 case, it is a simple_jump instead that again seems to be handled by patch_jump_insn just fine. Sure, redirecting an edge that was previously not crossing to be crossing or vice versa can fail, but that is not what shrink-wrapping needs. Also tested in GCC 8 with this patch and don't see ICEs there either (though, of course, I'm not suggesting we should backport this to release branches). The old ICEs could have been fixed by PR87475 fix or some other one years ago. 2020-12-17 Jakub Jelinek <ja...@redhat.com> PR rtl-optimization/98289 * shrink-wrap.c (can_get_prologue): Don't punt on EDGE_CROSSING incoming edges. * gcc.target/i386/pr98289.c: New test. * gcc.dg/torture/pr98289.c: New test.
