https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107293
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Aldy Hernandez <al...@gcc.gnu.org>: https://gcc.gnu.org/g:c9b840db504d15db01f06fe1fec38282dbafee07 commit r13-3341-gc9b840db504d15db01f06fe1fec38282dbafee07 Author: Aldy Hernandez <al...@redhat.com> Date: Mon Oct 17 18:56:24 2022 +0200 Make sure exported range for SSA post-dominates the DEF in set_global_ranges_from_unreachable_edges. The problem here is that we're exporting a range for an SSA range that happens on the other side of a __builtin_unreachable, but the SSA does not post-dominate the definition point. This is causing ivcanon to unroll things incorrectly. This was a snafu when converting the code from evrp. PR tree-optimization/107293 gcc/ChangeLog: * tree-ssa-dom.cc (dom_opt_dom_walker::set_global_ranges_from_unreachable_edges): Check that condition post-dominates the definition point. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/pr107293.c: New test.
