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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99755] failure to fold a conditional that's a
 subset of another expression
Date: Thu, 25 Mar 2021 07:57:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99755

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Blocks|                            |85316
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-03-25

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  We have no good notion of predicate combinations, their "range"=
 or
how other ranges depend on predicates.

It would be interesting to see how LLVM arrives at a folded f2().


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D85316
[Bug 85316] [meta-bug] VRP range propagation missed cases=