USE patch vs the PA

[John Carr]

>   > (1)	R1 = constant
>   > (2)	R2 = R1
>   > (3)	R1 = variable
> Note that if REG_N_SETS (R1) == 1, then find_base_value should return
> reg_base_value [REGNO (R1)] if it is nonzero.

Can you send me an example where this helps?


> The way it works right now, if regA is set to regB + regC and we
> don't know if regB & regC are "constant" when we see the set for
> regA, then we just set reg_base_value[regA] = regA.

There is code to pick the right register as the base: the one with
REGNO_POINTER_FLAG set.  A register without this flag shouldn't
contain a pointer.  Why isn't this working?