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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96912] Failure to optimize pblendvb pattern
Date: Thu, 03 Sep 2020 08:03:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96912

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2020-09-03
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
On GIMPLE this could be pattern-matched to a VEC_PERM_EXPR <> which is
how to represent blends.  Of course matching this on RTL is possible as wel=
l.

The difficulty is of course the mismatch in element sizes where the
mask appears to be byte granular while the data to be blended is double-wor=
ds.=