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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/91789] Value ranges determined from
 comparisons not used transitively
Date: Thu, 16 Dec 2021 00:09:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91789

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
We have in evrp:
 Registering value_relation (b_2(D) >=3D a_3(D)) on (2->4)

...

Relational : (b_2(D) >=3D a_3(D))
    <bb 4> :
    if (a_3(D) < 0)
      goto <bb 5>; [INV]
    else
      goto <bb 6>; [INV]

4->5  (T) a_3(D) :      int [-INF, -1]
4->6  (F) a_3(D) :      int [0, +INF]

But then we don't update the value relationship for what we had for b_2 for=
 the
branch where a_3 >=3D 0, we should also a range for b_2(D) of [0, +INF] for=
 4->6.=