Function muldiv_stall_cycles 

pub const fn muldiv_stall_cycles(op: MulDiv) -> u32

Pipeline stall in PCycles for a multiply or divide (UM Table 3-12).

These stall the entire pipeline — they are not background operations that complete while other instructions issue. MULT 5, DIV 37, DMULT 8, DDIV 69, with the unsigned forms costing the same as the signed.