https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121592
--- Comment #5 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:05284f73cff1685e2513b415e8da644193acf8cd commit r16-3282-g05284f73cff1685e2513b415e8da644193acf8cd Author: Richard Biener <rguent...@suse.de> Date: Tue Aug 19 12:31:53 2025 +0200 tree-optimization/121592 - failed reduction SLP discovery The testcase in the PR shows that when we have a reduction chain with a wrapped conversion we fail to properly fall back to a regular reduction, resulting in wrong-code. The following fixes this by failing discovery. The testcase has other issues, so I'm not including it here. PR tree-optimization/121592 * tree-vect-slp.cc (vect_analyze_slp): When SLP reduction chain discovery fails, fail overall when the tail of the chain isn't also the entry for the non-SLP reduction.
