roy rosen <roy.1ro...@gmail.com> writes:
> In my port I get to gen_reload to the lines
>
> /* If IN is a simple operand, use gen_move_insn. */
> else if (OBJECT_P (in) || GET_CODE (in) == SUBREG)
> {
> static int xxx;
> xxx = OBJECT_P (in);
> tem = emit_insn (gen_move_insn (out, in));
> /* IN may contain a LABEL_REF, if so add a REG_LABEL_OPERAND note. */
> mark_jump_label (in, tem, 0);
> }
>
> the emit_insn which should emit a move insn gets as out a register
> from class D and as in the Stack pointer.
> In my port there is no insn which can write directly from sp to d. so
> the emitted insn is invalid and the compilation terminates.
>
> What might be the problem?
> Is it possible to arrive to this point with such arguments and later
> to fix it or does the problem begin earlier somewhere.
This tends to mean that you haven't set REGISTER_MOVE_COST correctly.
You need to make sure that moves between register class D and the
stack pointer have a cost greater than 2. If you are unlucky you may
have to introduce a secondary reload.
Ian
