Rajiv KI <rajivkumarsingla@xxxxxxx> writes:
> (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.
The general idea should work. However, you appear to be returning a
void value from your define_insn_and_split. That won't work. The
define_insn_and_split needs to return a char*. Make sure that
functions like divert_to_si are declared in your CPU-protos.h file.
Make sure your code compiles without warnings.
Ian
