https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109025
--- Comment #11 from CVS 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:c1873079b05e399355eb79e4828ed9ba2d0c6968 commit r13-6503-gc1873079b05e399355eb79e4828ed9ba2d0c6968 Author: Richard Biener <rguent...@suse.de> Date: Mon Mar 6 10:43:13 2023 +0100 tree-optimization/109025 - fixup double reduction detection The following closes a gap in double reduction detection where we in the outer loop analysis fail to verify the inner LC PHI use is the latch definition of the inner loop PHI. That latch definition is used to detect that an inner loop is part of a double reduction when later doing the inner loop analysis. PR tree-optimization/109025 * tree-vect-loop.cc (vect_is_simple_reduction): Verify the inner LC PHI use is the inner loop PHI latch definition before classifying an outer PHI as double reduction. * gcc.dg/vect/pr109025.c: New testcase.
