https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121686
--- Comment #3 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:2027574bacf4fb665a4cb42a33608e169363b39f commit r16-3412-g2027574bacf4fb665a4cb42a33608e169363b39f Author: Richard Biener <rguent...@suse.de> Date: Wed Aug 27 09:53:49 2025 +0200 tree-optimization/121686 - failed SLP discovery for live recurrence The following adjusts the SLP build for only-live stmts to not only consider vect_induction_def and vect_internal_def that are not part of a reduction but instead consider all non-reduction defs that are not part of a reduction, specifically in this case a recurrence def. This is also a missed optimization on the gcc-15 branch (but IMO a very minor one). PR tree-optimization/121686 * tree-vect-slp.cc (vect_analyze_slp): Consider all only-live non-reduction defs for discovery. * gcc.dg/vect/pr121686.c: New testcase.
