About size of WASMInterpFrame. Why divide sizeof(WASMBranchBlock) by 4, multiply all_cell_num by 5?

[kfkfkfkfkfkf]

1. Why divide sizeof(WASMBranchBlock) by 4?
   

   wasm-micro-runtime/core/iwasm/interpreter/wasm_interp_classic.c

   Lines 3614 to 3618 in 6b3a939

   	all_cell_num = (uint64)cur_func->param_cell_num
   	+ (uint64)cur_func->local_cell_num
   	+ (uint64)cur_wasm_func->max_stack_cell_num
   	+ ((uint64)cur_wasm_func->max_block_num)
   	* sizeof(WASMBranchBlock) / 4;

2. Why multiply all_cell_num by 5?
   

   wasm-micro-runtime/core/iwasm/interpreter/wasm_interp.h

   Lines 68 to 73 in 6b3a939

   	static inline unsigned
   	wasm_interp_interp_frame_size(unsigned all_cell_num)
   	{
   	return align_uint((uint32)offsetof(WASMInterpFrame, lp) + all_cell_num * 5,
   	4);
   	}

I didn't understand the nessecity of these operations.
Could you tell me these reasons?