warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(15)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(16)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(17)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(18)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(19)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(20)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(21)
warning: Expression must be signed 8-bit [-Wtruncation]
    at sp-signed-truncation.asm(22)