[EXTERNAL] Re: rs6000: Fix typos in float128 ISA3.1 support

Kewen.Lin linkw@linux.ibm.com
Mon Jun 28 08:15:15 GMT 2021

on 2021/6/25 上午3:36, Segher Boessenkool wrote:
> On Thu, Jun 24, 2021 at 05:32:20PM +0800, Kewen.Lin wrote:
>> on 2021/6/24 上午12:58, Segher Boessenkool wrote:
>>> On Wed, Jun 23, 2021 at 12:17:07PM +0800, Kewen.Lin wrote:
>>>>>> +#ifdef FLOAT128_HW_INSNS_ISA3_1
>>>>>>  TFtype __floattikf (TItype_ppc)
>>>>>>    __attribute__ ((__ifunc__ ("__floattikf_resolve")));
>>>>> I wonder if we now need TItype_ppc at all anymore, btw?
>>>> Sorry that I don't quite follow this question.
>>> I thought it may do the same as just TItype now, but the ifunc stuff
>>> probably makes it different still :-)
>> Ah, thanks for the clarification!  If I read it right, TItype is defined
>> with __attribute__ ((mode (TI))) while TItype_ppc is defined with 
>> __attribute__ ((__mode__ (__TI__))), the later writing looks special.
> I managed to read things wrong, I thought there was some ifunc stuff in
> the definition of TItype_ppc.  Of course there is not, it is just
> setting the mode.
> mode(__TI__) is just the more portable way of writing mode(TI), the
> latter will not work if something #define's TI (you cannot do that with
> __TI__, you are not allowed to by the C standard, in application code).

Yeah, thanks for the note.  It looks better to update the generic
macro with this ppc style "__" writting and remove ppc one. :-)

One related bug PR101235 was just opened, I noticed the culprit commit
was backported to GCC11, is it OK to backport this fix to GCC 11 if
everything goes well in one more week?


More information about the Gcc-patches mailing list