> On Oct 2, 2020, at 10:15 AM, Richard Sandiford <richard.sandif...@arm.com>
> wrote:
>
> Qing Zhao <qing.z...@oracle.com> writes:
>>>
>>> Going back to the default hook, I guess one option is:
>>>
>>> rtx zero = CONST0_RTX (reg_raw_mode[regno]);
>>> rtx_insn *insn = emit_insn (gen_rtx_SET (regno_reg_rtx[regno], zero));
>>> if (!valid_insn_p (insn))
>>> sorry (…);
>>
>> “Sorry” here will tell the user that the implementation on this platform is
>> not valid?
>
> Right. If we didn't have a default implementation of the target hook,
> we would presumably need to issue a sorry () if the user tried to use
> the option on a target that didn't define the hook. The above is a
> compromise: we instead make a reasonable attempt to handle the option,
> and issue the sorry only if that attempt fails.
Sounds reasonable, I will do this.
thanks.
Qing
>
> Thanks,
> Richard
>
>>
>> Qing
>>>
>>> but with some mechanism to avoid spewing the user with messages
>>> for the same problem.
>>>
>>> Thanks,
>>> Richard
