https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116985
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Feng Xue <f...@gcc.gnu.org>: https://gcc.gnu.org/g:a9173a50e7e346a218323916e4d3add8552529ae commit r15-4294-ga9173a50e7e346a218323916e4d3add8552529ae Author: Feng Xue <f...@os.amperecomputing.com> Date: Fri Oct 11 14:55:05 2024 +0800 vect: Fix inconsistency in fully-masked lane-reducing op generation [PR116985] To align vectorized def/use when lane-reducing op is present in loop reduction, we may need to insert extra trivial pass-through copies, which would cause mismatch between lane-reducing vector copy and loop mask index. This could be fixed by computing the right index around a new counter on effective lane- reducing vector copies. 2024-10-11 Feng Xue <f...@os.amperecomputing.com> gcc/ PR tree-optimization/116985 * tree-vect-loop.cc (vect_transform_reduction): Compute loop mask index based on effective vector copies for reduction op. gcc/testsuite/ PR tree-optimization/116985 * gcc.dg/vect/pr116985.c: New testcase.
