debugging the cross compiler

[htio2]

Hi,

I am porting gcc to a costum target and have encounter an compiler internal
error regarding this

;; _6 ={v} dd;

(insn 12 11 0 (set (reg:HI 23 [ D.1350 ])
        (zero_extend:HI (mem/v/c:QI (plus:HI (reg/f:HI 18
virtual-stack-vars)
                    (const_int -7 [0xfffffff9])) [4 ddD.1336

it bail out at:
internal compiler error: in gen_lowpart_general, at rtlhooks.c:51
this error is cause by function emit-rtl.c:gen_lowpart_common() returns 0 at 
  if ((msize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD
      > ((xsize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD))
    return 0; 

and the program i am compiling is:
int main(void)
{
	volatile unsigned short dd = 12; 
	volatile unsigned long hh = 0xfffffffffffff; 

	hh = dd;
}

please advice.
Thanks.




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