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* [Bug tree-optimization/92834] misssed SLP vectorization in LightPixel
       [not found] <bug-92834-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-25  8:00 ` pinskia at gcc dot gnu.org
  2021-08-25  9:30 ` rguenth at gcc dot gnu.org
  1 sibling, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-25  8:00 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92834

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is now the standard GCC SLP does not vectorize starting at loads
but rather starts at stores issue.

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug tree-optimization/92834] misssed SLP vectorization in LightPixel
       [not found] <bug-92834-4@http.gcc.gnu.org/bugzilla/>
  2021-08-25  8:00 ` [Bug tree-optimization/92834] misssed SLP vectorization in LightPixel pinskia at gcc dot gnu.org
@ 2021-08-25  9:30 ` rguenth at gcc dot gnu.org
  1 sibling, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-08-25  9:30 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92834

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
So there is a store and we vectorize it:

  _188 = {_10, _14, _18, _22};
  MEM[(union ._anon_7 *)&color] = _188;
  _43 = color.bgra;
  color ={v} {CLOBBER};
  return _43;

but we fail to vectorize more because there's a mix of min/max operations
here.  In fact we even recognize the reduction on the 'A' component but
again we fail to be clever enough to exploit it (it's also 3 lanes and
thus difficult to handle).

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-08-25  9:30 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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     [not found] <bug-92834-4@http.gcc.gnu.org/bugzilla/>
2021-08-25  8:00 ` [Bug tree-optimization/92834] misssed SLP vectorization in LightPixel pinskia at gcc dot gnu.org
2021-08-25  9:30 ` rguenth at gcc dot gnu.org

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