https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121638
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:2d4b7b983c7232325a9a7659e37143bdd5112dcc commit r16-3367-g2d4b7b983c7232325a9a7659e37143bdd5112dcc Author: Richard Biener <rguent...@suse.de> Date: Mon Aug 25 11:02:52 2025 +0200 tree-optimization/121638 - missed SLP discovery of live induction The following fixes a missed SLP discovery of a live induction. Our pattern matching of those fails because of the PR81529 fix which I think was misguided and should now no longer be relevant. So this essentially reverts that fix. I have added a GIMPLE testcase to increase the chance the particular IL is preserved through the future. This shows that how we make some IVs live because of early-break isn't quite correct, so I had to preserve a hack here. Hopefully to be investigated at some point. PR tree-optimization/121638 * tree-vect-stmts.cc (process_use): Do not make induction PHI backedge values relevant. * gcc.dg/vect/pr121638.c: New testcase.
