Hi! Given that the s390 backend defines pretty much the same target hook as rs6000, I believe it suffers (at least when using -mvx?) the same problem as rs6000, though admittedly this is so far completely untested.
Ok for trunk if it passes bootstrap/regtest there? 2023-11-29 Jakub Jelinek <ja...@redhat.com> PR target/112725 * config/s390/s390.cc (s390_invalid_arg_for_unprototyped_fn): Return NULL for __builtin_classify_type calls with vector arguments. --- gcc/config/s390/s390.cc.jj 2023-11-27 17:34:25.684287136 +0100 +++ gcc/config/s390/s390.cc 2023-11-29 09:41:08.569491077 +0100 @@ -12650,7 +12650,8 @@ s390_invalid_arg_for_unprototyped_fn (co && VECTOR_TYPE_P (TREE_TYPE (val)) && (funcdecl == NULL_TREE || (TREE_CODE (funcdecl) == FUNCTION_DECL - && DECL_BUILT_IN_CLASS (funcdecl) != BUILT_IN_MD))) + && DECL_BUILT_IN_CLASS (funcdecl) != BUILT_IN_MD + && !fndecl_built_in_p (funcdecl, BUILT_IN_CLASSIFY_TYPE)))) ? N_("vector argument passed to unprototyped function") : NULL); } Jakub