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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109943] [13/14 Regression] Missed Dead Code
 Elimination when using __builtin_unreachable since r13-6834-g41ade3399bd
Date: Mon, 21 Aug 2023 23:09:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-08-21
             Status|UNCONFIRMED                 |NEW

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the testcase in comment #0, fre3 is able to optmize it away (in GCC
12.3.0):
Applying pattern match.pd:636, gimple-match.cc:47124
Match-and-simplified _10 % _8 to 0

That is because we figure out that _10 is the same as _8 somehow.

Confirmed.=