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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/55157] Missed VRP with != 0 and multiply
Date: Mon, 07 Nov 2022 20:02:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55157

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #14 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #11)
> Created attachment 53827 [details]
> revised patch in testing

(In reply to Aldy Hernandez from comment #4)
> We have a variety of ways of fixing this:
>   1. Improve the range-op entry for MULT_EXPR.
>   2. Handle nonzero bits in the relational operators.
>   3. Reflect the nonzero bits in the actual range for trivial masks.

I'm going to close this PR as fixed, though I'd still like to do #3 as
discussed if we can accept a performance degradation, or come up with a more
efficient way of doing so.  Either way, that is irrelevant to the PR per se.

Fixed in trunk.=