https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111446
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:7ea501d3ea698e1c845fb61e3487f4cd949e6253 commit r14-4114-g7ea501d3ea698e1c845fb61e3487f4cd949e6253 Author: Andrew Pinski <apin...@marvell.com> Date: Sun Sep 17 11:20:36 2023 -0700 MATCH: Make zero_one_valued_p non-recursive fully So it turns out VN can't handle any kind of recursion for match. In this case we have `b = a & -1` and we try to match a as being zero_one_valued_p and VN returns b as being the value and we just go into an infinite loop at this point. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. Note genmatch should warn (or error out) if this gets detected so I filed PR 111446 which I will be looking into next week or the week after so we don't run into this issue again. PR tree-optimization/111442 gcc/ChangeLog: * match.pd (zero_one_valued_p): Have the bit_and match not be recursive. gcc/testsuite/ChangeLog: * gcc.c-torture/compile/pr111442-1.c: New test.
