https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119613
--- Comment #8 from GCC 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:77e0c0df0907657a7d72bbba9e6329d93ec65edb commit r15-9207-g77e0c0df0907657a7d72bbba9e6329d93ec65edb Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Apr 4 20:51:50 2025 +0200 cfgrtl: Remove REG_EH_REGION notes from tail calls [PR119613] In PR119491 r15-9154 I've allowed some useless EH regions for musttail calls (if there are no non-debug/clobber stmts before resx which resumes external throwing). Now, for -O1+ (but not -O0/-Og) there is a cleanup_eh pass after it which should optimize that way. The following testcase ICEs at -O0 though, the cleanup_eh in that case is before the musttail pass and dunno why it didn't actually optimize it away. The following patch catches that during expansion and just removes the note, which causes EH cleanups to do the rest. A tail call, even when it throws, will not throw while the musttail caller's frame is still on the stack, will throw after that and so REG_EH_REGION for it is irrelevant (like it would be never set before the r15-9154 changes). 2025-04-04 Jakub Jelinek <ja...@redhat.com> PR middle-end/119613 * cfgrtl.cc (purge_dead_edges): Remove REG_EH_REGION notes from tail calls. * g++.dg/opt/pr119613.C: New test.
