insn does not satisfy its constraints

[Boris Boesler]

Hi!

Am 05.10.2007 um 21:48 schrieb Rask Ingemann Lambertsen:

>> *** 66? This is impossible!! There is no register set that contains
>> that register!
>    Stack, frame or argument pointer?

  No, they are address registers and they are FIXED, that' why they  
are not in register sets Ax.


>    You should have a class which is the union of the Rx and Ax  
> classes,
> placed somewhere between Ax and GENERAL. If you have instructions  
> which take
> both Rx and Ax, define a constraint for this new class.

  Basically, such a class exist, but not used. But even if I change  
such a class nothing changes.


>    Is your REGNO_REG_CLASS() correct?

  Yes.


>> *** Why was this movsi instruction (insn 21) inserted? It should move
>> R0 to an address register.
>
>    The reload pass inserted insn 21 (this is the "Reload 0" above)  
> before
> insn 8 because it found that register R0 was no good for the  
> address in insn
> 8. Unfortunately, it picked R2 which isn't any good either.

  But that's what BASE_REG_CLASS id for.


>>  There seems to be a problem with my mov<mode> instruction?
>> ...
>    Replace the first four alternatives with just one using the  
> combined
> Rx+Ax class from above. Better yet, since the fifth alternative r- 
> >r should
> cover it and the instruction is the same, try deleting the first four
> alternatives.

  There is no r->r, but I replaced all Rx / Ax alternatives by r: no  
change!


>    What is your REGISTER_MOVE_COST? Just wondering.

// Macro: REGISTER_MOVE_COST (MODE, FROM, TO)
#define REGISTER_MOVE_COST(MODE, FROM, TO) 1

// Macro: MEMORY_MOVE_COST (MODE, CLASS, IN)
#define MEMORY_MOVE_COST(MODE, CLASS, IN) 2

// Macro: BRANCH_COST
#define BRANCH_COST 2

Thanks,
Boris