[Mono] Fix Vector128 divide by scalar (#78784)

* Fix divide by scalar

* Add missing vector/vector and vector*vector case

src/mono/mono/mini/simd-intrinsics.c

@@ -302,6 +302,20 @@ emit_simd_ins_for_binary_op (MonoCompile *cfg, MonoClass *klass, MonoMethodSigna
 				break;
 			case SN_Divide:
 			case SN_op_Division:
+				if (strcmp ("Vector4", m_class_get_name (klass)) && strcmp ("Vector2", m_class_get_name (klass))) {
+					if ((fsig->params [0]->type == MONO_TYPE_GENERICINST) && (fsig->params [1]->type != MONO_TYPE_GENERICINST)) {
+						MonoInst* ins = emit_simd_ins (cfg, klass, OP_CREATE_SCALAR_UNSAFE, args [1]->dreg, -1);
+						ins->inst_c1 = arg_type;
+						ins = emit_simd_ins (cfg, klass, OP_XBINOP_BYSCALAR, args [0]->dreg, ins->dreg);
+						ins->inst_c0 = OP_FDIV;
+						return ins;
+					} else if ((fsig->params [0]->type == MONO_TYPE_GENERICINST) && (fsig->params [1]->type == MONO_TYPE_GENERICINST)) {
+						instc0 = OP_FDIV;
+						break;
+					} else {
+						return NULL;
+					}
+				}
 				instc0 = OP_FDIV;
 				break;
 			case SN_Max:
@@ -325,6 +339,11 @@ emit_simd_ins_for_binary_op (MonoCompile *cfg, MonoClass *klass, MonoMethodSigna
 						ins = emit_simd_ins (cfg, klass, OP_XBINOP_BYSCALAR, ins->dreg, args [1]->dreg);
 						ins->inst_c0 = OP_FMUL;
 						return ins;
+					} else if ((fsig->params [0]->type == MONO_TYPE_GENERICINST) && (fsig->params [1]->type == MONO_TYPE_GENERICINST)) {
+						instc0 = OP_FMUL;
+						break;
+					} else {
+						return NULL;
 					}
 				}
 				instc0 = OP_FMUL;