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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/64700] Sink common code through PHI
Date: Tue, 20 Jul 2021 02:52:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D64700

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org
                 CC|                            |pinskia at gcc dot gnu.org
           Severity|normal                      |enhancement

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  <bb 7> [local count: 958878293]:
  if (dir_lsm.26_39 =3D=3D 1)
    goto <bb 8>; [34.00%]
  else
    goto <bb 9>; [66.00%]

  <bb 8> [local count: 326018623]:
  _11 =3D arr1.6_10 + _5;
  _12 =3D *_11;
  goto <bb 10>; [100.00%]

  <bb 9> [local count: 632859670]:
  _14 =3D arr2.9_13 + _5;
  _15 =3D *_14;

  <bb 10> [local count: 958878293]:
  # cstore_45 =3D PHI <_12(8), _15(9)>

PHI-OPT improvements that I am working on might be able to handle this case
too.
MEM_EXPR is a little harder than the normal expression as you need to check=
 the
access type for aliasing reasons.

Note PHI-OPT does handle the casting case already (but it is not listed her=
e).=