+ /* Parameter cases. */
+ if (arg_class != ARG_CLASS_MEMORY && MONO_WIN64_VALUE_TYPE_FITS_REG (arg_size)) {
+ assert (arg_size == 1 || arg_size == 2 || arg_size == 4 || arg_size == 8);
+
+ /* First, try to use registers for parameter. If type is struct it can only be passed by value in integer register. */
+ arg_info->storage = ArgValuetypeInReg;
+ if (!allocate_parameter_register_for_valuetype_win64 (arg_info, !MONO_TYPE_ISSTRUCT (type) ? arg_class : ARG_CLASS_INTEGER, arg_size, current_int_reg, current_float_reg)) {
+ /* No more registers, fallback passing parameter on stack as value. */
+ assert (arg_info->pair_storage [0] == ArgNone && arg_info->pair_storage [1] == ArgNone && arg_info->pair_size [0] == 0 && arg_info->pair_size [1] == 0 && arg_info->nregs == 0);
+
+ /* Passing value directly on stack, so use size of value. */
+ arg_info->storage = ArgOnStack;
+ arg_size = ALIGN_TO (arg_size, sizeof (mgreg_t));
+ arg_info->offset = *stack_size;
+ arg_info->arg_size = arg_size;
+ *stack_size += arg_size;
+ }
+ } else {
+ /* Fallback to stack, try to pass address to parameter in register. Always use integer register to represent stack address. */
+ arg_info->storage = ArgValuetypeAddrInIReg;
+ if (!allocate_parameter_register_for_valuetype_win64 (arg_info, ARG_CLASS_INTEGER, arg_size, current_int_reg, current_float_reg)) {
+ /* No more registers, fallback passing address to parameter on stack. */
+ assert (arg_info->pair_storage [0] == ArgNone && arg_info->pair_storage [1] == ArgNone && arg_info->pair_size [0] == 0 && arg_info->pair_size [1] == 0 && arg_info->nregs == 0);
+
+ /* Passing an address to value on stack, so use size of register as argument size. */
+ arg_info->storage = ArgValuetypeAddrOnStack;
+ arg_size = sizeof (mgreg_t);
+ arg_info->offset = *stack_size;
+ arg_info->arg_size = arg_size;
+ *stack_size += arg_size;
+ }