shifting among patterns

[Rajiv KI <rajivkumarsingla at gmx dot com>]

Hi all,

I am new to this porting gcc architecture field. I have a doubt.

What i was trying is, In "movdi" pattern for some pairs of constraints like
(r,r) or (m,r) i was letting movdi pattern to handle this while working over
64bit data. But for other constraints pair like (r,i) or (r,m) i was trying
to make movsi handle this pair of constraints by diverting from movdi to
movsi. I did it in this way:

(define_expand "movdi"
  [(set (match_operand:DI 0 "general_operand" "")
	(match_operand:DI 1 "general_operand" ""))]
  ""
  "
  	if(GET_CODE(operands[0])==MEM && GET_CODE(operands[1])!=REG)

	{   

		  if(can_create_pseudo_p())

	   	  {

			operands[1]=force_reg(DImode,operands[1]);

	   	  }

	}
  "
)
(define_insn_and_split "*movdi"
  [(set(match_operand: DI 0  "nonimmediate_operand" "=r,r,r,m")

        (match_operand:  DI  1   "general_operand"        "r,Di,m,r"))]
        ""
	"*
	 switch (which_alternative)
	 {
	 case 0:  return \"#\";
	 case 1:  
	 case 2:  return divert_to_si(operands);
	 case 3:  return output_move_double (operands);	 
	 }"
	"reload_completed"
      [(set (match_dup 0)(match_dup 1))
	 (set (match_dup 2)(match_dup 3))]
        "{
	    operands[2] = gen_highpart (SImode, operands[0]);
	    operands[0] = gen_lowpart (SImode, operands[0]);
 	    operands[3] = gen_highpart (SImode, operands[1]);
	    operands[1] = gen_lowpart (SImode, operands[1]);
	}"
)

Here 'Di' is constraint for double integer range.

And 'divert_to_si' is function i have written in '.c' file:

void divert_to_si(rtx *operands)
{
	printf("inside divert_to_si fxn\n");
	emit_insn(gen_movsi(operands[0],operands[1]));
}

My doubts are:

1.Can we do this type of diversion?
2.To me its giving 'segmentation fault' for simple 64bit assignment.

I am new, learning while practising. Please help me in this.

Rajiv.








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