On 10/02/11 17:59, Richard Henderson wrote:
If constants are never valid as the source of a store,
They are but it really depends to which registers they are going to. If the destination belongs to a certain class it is ok, for all the others it is not. It is tricky even to define costs when you are given:
rtx_costs of (const_int 0), outer_code SET.This might be very, very cheap or very, very expensive for certain classes of registers.
