https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82084
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, we could simply reject STRING_CSTs in vectorizable_store:
Index: gcc/tree-vect-stmts.c
===================================================================
--- gcc/tree-vect-stmts.c (revision 251559)
+++ gcc/tree-vect-stmts.c (working copy)
@@ -5733,6 +5733,16 @@ vectorizable_store (gimple *stmt, gimple
op = gimple_assign_rhs1 (stmt);
+ /* In the case this is a store from a STRING_CST make sure
+ native_encode_expr can handle it. */
+ if (TREE_CODE (op) == STRING_CST
+ && (TREE_CODE (TREE_TYPE (op)) != ARRAY_TYPE
+ || TREE_CODE (TREE_TYPE (TREE_TYPE (op))) != INTEGER_TYPE
+ || (GET_MODE_BITSIZE
+ (SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (op))))
+ != BITS_PER_UNIT)))
+ return false;
+
if (!vect_is_simple_use (op, vinfo, &def_stmt, &dt, &rhs_vectype))
{
if (dump_enabled_p ())
probably best for branches.
