On Fri, Sep 21, 2018 at 12:50:40PM +0200, Ulrich Weigand wrote:
> Ilya Leoshkevich wrote:
>
> > 2018-09-19 Ilya Leoshkevich
> >
> > PR target/80080
> > * config/s390/s390.md: Do not use PARALLEL RETURN+USE when
> > returning via %r14.
>
> This makes sense to me. I'm just wonderin
> Am 21.09.2018 um 12:50 schrieb Ulrich Weigand :
>
> Ilya Leoshkevich wrote:
>
>> 2018-09-19 Ilya Leoshkevich
>>
>> PR target/80080
>> * config/s390/s390.md: Do not use PARALLEL RETURN+USE when
>> returning via %r14.
>
> This makes sense to me. I'm just wondering if it would
Ilya Leoshkevich wrote:
> 2018-09-19 Ilya Leoshkevich
>
> PR target/80080
> * config/s390/s390.md: Do not use PARALLEL RETURN+USE when
> returning via %r14.
This makes sense to me. I'm just wondering if it wouldn't be
simpler to do the check for r14 right in s390_emit_epilo
S/390 epilogue ends with (parallel [(return) (use %r14)]) instead of
the more usual (return) or (simple_return). This sequence is not
recognized by the conditional return logic in try_optimize_cfg ().
This was introduced for processors older than z196, where it is
sometimes profitable to use call
