loop hoisting fails

[Paulo J. Matos]

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.