https://gcc.gnu.org/g:c6865e7e15bc9a1337df00d2ca03604e1712a2dd
commit r16-4156-gc6865e7e15bc9a1337df00d2ca03604e1712a2dd Author: Richard Biener <[email protected]> Date: Wed Oct 1 11:26:45 2025 +0200 tree-optimization/122110 - do not reject all bit-precision reductions We can handle bitwise-operation reductions and reductions on mask vectors just fine. PR tree-optimization/122110 * tree-vect-loop.cc (vectorizable_reduction): Relax restriction to mode-precision operations. Diff: --- gcc/tree-vect-loop.cc | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index 18360375e297..1d549e4a03e2 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -7187,7 +7187,11 @@ vectorizable_reduction (loop_vec_info loop_vinfo, return false; /* Do not try to vectorize bit-precision reductions. */ - if (!type_has_mode_precision_p (op.type)) + if (!VECTOR_BOOLEAN_TYPE_P (vectype_out) + && !type_has_mode_precision_p (op.type) + && op.code != BIT_AND_EXPR + && op.code != BIT_IOR_EXPR + && op.code != BIT_XOR_EXPR) return false; /* Lane-reducing ops also never can be used in a SLP reduction group
