[PATCH, SMS] Prevent the creation of reg-moves for definitions with MODE_CC

[Richard Sandiford]

Revital Eres <revital.eres@linaro.org> writes:
> +/* Return true if one of the definitions in INSN has MODE_CC.  Otherwise
> +   return false.  */
> +static bool
> +def_has_ccmode_p (rtx insn)
> +{
> +  df_ref *def;
> +
> +  for (def = DF_INSN_DEFS (insn); *def; def++)
> +    {
> +      enum machine_mode mode = GET_MODE (DF_REF_REG (*def));
> +
> +      if (GET_MODE_CLASS (mode) == MODE_CC)
> +       return true;
> +    }
> +
> +  return false;
> +}

FWIW, an alternative might be to test have_regs_of_mode[(int) mode].
That says whether there are any allocatable (non-fixed) registers
of the given mode.

Richard