https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #17 from JuzheZhong ---
(In reply to Tamar Christina from comment #16)
> >
> > I wonder whether ARM SVE can also use this approach VEC_EXTRACT with index =
> > 0.
>
> Perhaps, I'll look into it thanks. though this is ofcourse only
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #16 from Tamar Christina ---
>
> I wonder whether ARM SVE can also use this approach VEC_EXTRACT with index =
> 0.
Perhaps, I'll look into it thanks. though this is ofcourse only applicable when
the mask comes from whilelo.
In
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #15 from Tamar Christina ---
(In reply to JuzheZhong from comment #14)
> > > > sure, but you can't use BIT_FIELD_REF on VLA vectors.
> > >
> > > So, for length partial vector. We can use VEC_EXTRACT with index = 0 since
> > >
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #14 from JuzheZhong ---
(In reply to Tamar Christina from comment #13)
> (In reply to JuzheZhong from comment #12)
> > (In reply to Tamar Christina from comment #11)
> > > (In reply to JuzheZhong from comment #10)
> > > > (In reply
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #13 from Tamar Christina ---
(In reply to JuzheZhong from comment #12)
> (In reply to Tamar Christina from comment #11)
> > (In reply to JuzheZhong from comment #10)
> > > (In reply to Tamar Christina from comment #9)
> > > > (In
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #12 from JuzheZhong ---
(In reply to Tamar Christina from comment #11)
> (In reply to JuzheZhong from comment #10)
> > (In reply to Tamar Christina from comment #9)
> > > (In reply to JuzheZhong from comment #8)
> > > > Suppose the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #11 from Tamar Christina ---
(In reply to JuzheZhong from comment #10)
> (In reply to Tamar Christina from comment #9)
> > (In reply to JuzheZhong from comment #8)
> > > Suppose the loop mask is generated by whilelo instruction of
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #10 from JuzheZhong ---
(In reply to Tamar Christina from comment #9)
> (In reply to JuzheZhong from comment #8)
> > Suppose the loop mask is generated by whilelo instruction of ARM SVE.
> >
> > Suppose we have 8 elements in a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #9 from Tamar Christina ---
(In reply to JuzheZhong from comment #8)
> Suppose the loop mask is generated by whilelo instruction of ARM SVE.
>
> Suppose we have 8 elements in a single whole vector.
>
> mask = whilo (0, res) if res
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #8 from JuzheZhong ---
(In reply to Tamar Christina from comment #7)
> You may be able to use the same approach as
>
> else if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo))
>
> that is, reverse both the mask and the vector and using
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #7 from Tamar Christina ---
You may be able to use the same approach as
else if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo))
that is, reverse both the mask and the vector and using extract last.
It's not going to be performance
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #6 from Tamar Christina ---
(In reply to JuzheZhong from comment #5)
> (In reply to Tamar Christina from comment #4)
> > (In reply to JuzheZhong from comment #3)
> > > I guess this code is just disabling partial vector for length
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #5 from JuzheZhong ---
(In reply to Tamar Christina from comment #4)
> (In reply to JuzheZhong from comment #3)
> > I guess this code is just disabling partial vector for length for now.
> >
> > And need me to test and port this
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #4 from Tamar Christina ---
(In reply to JuzheZhong from comment #3)
> I guess this code is just disabling partial vector for length for now.
>
> And need me to test and port this part for length in the followup patches.
>
> Am I
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113134
--- Comment #3 from JuzheZhong ---
Thanks Tamar. And I agree with you. This is not supposed to let early break to
handle that. It should be optimization on scalar IR instead of loop
vectorizer.
I believe it is GCC-15 topic.
Btw, I am trying
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