[llvm-bugs] [Bug 47437] No vectorization - should use pmaddwd

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47437

Simon Pilgrim <llvm-dev at redking.me.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
 Fixed By Commit(s)|                            |6ec644e2157d63acccacd877cf0
                   |                            |8c68d5836c169
         Resolution|---                         |FIXED

--- Comment #4 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
(In reply to Simon Pilgrim from comment #3)
> (In reply to David Bolvansky from comment #2)
> > Thanks for improvements, with AVX LLVM 14 produces vpmaddwd, not yet with
> > plain "-O3".
> 
> It should in fact work with most SSE41+ targets (although not SLM which has
> some custom costs that push it just over the threshold).
> 
> The next step is to improve pre-AVX2 interleaved costs which should allow
> the LV costs analysis to see this as beneficial.
> 
> I've started the process at https://reviews.llvm.org/D111822

https://reviews.llvm.org/D111938 should fix this whenever interleaving is
enabled.

-march=atom is the only case where we don't enable interleaving on x86,
although we probably should now that the atom model and costs have been
improved.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20211017/cf4649a9/attachment-0001.html>