More help to my port. nospam

[Anders Ådland <aaadland at atmel dot no>]

Hi,
Sorry for bothering you again, but I don't want to do too many misstakes...

The insn
(set (mem:SI (reg:SI 76))
      (reg:SI 83))
is changed to
(set (mem:SI (plus:SI (reg:SI 39)
                       (reg:SI 154)))
      (reg:SI 83))
in the instruction combination pass. This can be done because the 
template's predicate functions is returning non-zero. Later, in the global 
register allocation pass, pseudo register 154 is moved to the stack and 
the insn is changed to
(set (mem:SI (plus:SI (reg:SI 39)
                       (plus:SI (reg:SI 6 r7)
                                (const_int -16))))
      (reg:SI 2 r3))
which is an illegal pattern.

I know that LEGITIMATE_ADDRESS is defined in two versions depending on if 
REG_OK_STRICT is defined or not, but this macro is only used to check if 
the first version of the insn is legal, not the others. They are only 
checked by the template's predicate function. To solve the problem I had 
to change the predicate function to not allow pseudo registers where 
(reg:SI 154) is located in the insn. This would however make less 
optimized code if the pseudo can be mapped to a hard register.

How can I solve this problem?

Thanks.

Anders