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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107090] [aarch64] sequence logic should be
 combined with mul and umulh
Date: Thu, 29 Sep 2022 21:32:35 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107090

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-09-29
          Component|middle-end                  |tree-optimization
     Ever confirmed|0                           |1
                 CC|                            |pinskia at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A few issues.
First is:

  if (_26 !=3D 0)
    goto <bb 3>; [50.00%]
  else
    goto <bb 4>; [50.00%]

  <bb 3> [local count: 536870913]:
  ht_15 =3D ht_13 + 4294967296;

  <bb 4> [local count: 1073741824]:
  # ht_2 =3D PHI <ht_13(2), ht_15(3)>

This should be done as:
tmp_ =3D _26 !=3D 0
tmp1_ =3D (unsigned long) tmp_
tmp2_ =3D tmp1_ << 32;
ht_2 =3D ht_13 + tmp2_;

And then there is huge pattern matching with respect to doing widening mult=
iple
here.=