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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/40589] efficiency problem with V2HI add
Date: Sun, 29 Aug 2021 22:49:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D40589

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.9.1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed for GCC 5 by r5-1564 and backported to GCC 4.9.1.

The code now looks like:
  /* For very wide vectors, try using a smaller vector mode.  */
  tree compute_type =3D type;
  if (op
      && (!VECTOR_MODE_P (TYPE_MODE (type))
          || optab_handler (op, TYPE_MODE (type)) =3D=3D CODE_FOR_nothing))
    {

Which solved this exact issue:

N=3D4  V2HI
N=3D8  DImode
N=3D16 TImode
N=3D32 BLKmode
N=3D64 BLKmode=