https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105923
--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> --- Hmm, it's in i386.cc 23455/* Set CLONEI->vecsize_mangle, CLONEI->mask_mode, CLONEI->vecsize_int, 23456 CLONEI->vecsize_float and if CLONEI->simdlen is 0, also 23457 CLONEI->simdlen. Return 0 if SIMD clones shouldn't be emitted, 23458 or number of vecsize_mangle variants that should be emitted. */ 23459 23460static int 23461ix86_simd_clone_compute_vecsize_and_simdlen (struct cgraph_node *node, 23462 struct cgraph_simd_clone *clonei, 23463 tree base_type, int num) ... 23509 case E_QImode: 23510 case E_HImode: 23511 case E_SImode: 23512 case E_DImode: 23513 case E_SFmode: 23514 case E_DFmode: 23515 /* case E_SCmode: */ 23516 /* case E_DCmode: */ 23517 if (!AGGREGATE_TYPE_P (arg_type)) 23518 break; 23519 /* FALLTHRU */ 23520 default: 23521 if (clonei->args[i].arg_type == SIMD_CLONE_ARG_TYPE_UNIFORM) 23522 break; 23523 warning_at (DECL_SOURCE_LOCATION (node->decl), 0, 23524 "unsupported argument type %qT for simd", arg_type); 23525 return 0; 23526 } 23527 }