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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/67628] [tree-optimization] (a && b) && c
 shows better codegen than a && (b && c)
Date: Tue, 20 Jul 2021 06:50:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D67628

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-06-07 00:00:00         |2021-7-19
           Severity|normal                      |enhancement

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  if (a_5(D) > b_6(D))
    goto <bb 3>; [50.00%]
  else
    goto <bb 4>; [50.00%]

  <bb 3> [local count: 536870913]:
  _1 =3D b_6(D) <=3D c_7(D);
  _2 =3D c_7(D) > d_8(D);
  _3 =3D _1 & _2;
  _10 =3D (int) _3;

  <bb 4> [local count: 1073741824]:
  # iftmp.1_4 =3D PHI <_10(3), 0(2)>


If what was in BB 3 was simplier, I have patches to implement that already.
The last time I tried to disable the code in fold_truth_andor there was some
testsuite fall out. I won't be able to get to trying to fix this until next
year at the earliest I think.=