https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110776
Kewen Lin <linkw at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rguenth at gcc dot gnu.org --- Comment #3 from Kewen Lin <linkw at gcc dot gnu.org> --- The failure exposed one special case: there is one stmt # VUSE <.MEM_404> _15 = *_14; its STMT_VINFO_STRIDED_P (stmt_info) is set, memory_access_type is VMAT_ELEMENTWISE and alignment_support_scheme is dr_unaligned_supported, its vector type is "vector(1) long int", so in the handling it's taken as: /* Load vector(1) scalar_type if it's 1 element-wise vectype. */ else if (nloads == 1) ltype = vectype; as its ltype is vector type, we cost it with if (VECTOR_TYPE_P (ltype)) vect_get_load_cost (vinfo, stmt_info, 1, alignment_support_scheme, misalignment, false, &inside_cost, nullptr, cost_vec, cost_vec, true); as it's dr_unaligned_supported, it's costed as unaligned_load then causes the ICE. One idea is to teach rs6000_builtin_vectorization_cost about one single lane vector unaligned load as scalar_load. But I think it's simple to treat single lane vector load as scalar_load, as I expect veclower will lower it later. diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc index 4622d6a04ef..bdf4c12cd03 100644 --- a/gcc/tree-vect-stmts.cc +++ b/gcc/tree-vect-stmts.cc @@ -9985,7 +9985,9 @@ vectorizable_load (vec_info *vinfo, { if (costing_p) { - if (VECTOR_TYPE_P (ltype)) + /* For a single lane vector type, we should cost it as + scalar_load to avoid ICE, see PR110776. */ + if (VECTOR_TYPE_P (ltype) && lnel > 1) vect_get_load_cost (vinfo, stmt_info, 1, alignment_support_scheme, misalignment, false, &inside_cost, nullptr, cost_vec, Hi Richi, what do you think of this?