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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/110931] [14 Regression] Dead Code Elimination Regression since r14-2890-gcc2003cd875
Date: Mon, 07 Aug 2023 15:25:19 +0000	[thread overview]
Message-ID: <bug-110931-4-vSjWXipVVj@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-110931-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110931

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Basically there is a missing VRP happening here:
l.0_1   [irange] int [-INF, -65536][0, 0][65536, +INF]
Partial equiv (b_6 pe8 l.0_1)
    <bb 3> :
    b_6 = (char) l.0_1;
...
Obvious that b_6 will have the range [0,0] as the other parts of l.0_1 is
outside of that range. But for some reason VRP didn't figure that out here ...

I don't understand how this is supposed to work

  parent reply	other threads:[~2023-08-07 15:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-07 10:33 [Bug tree-optimization/110931] New: " theodort at inf dot ethz.ch
2023-08-07 14:57 ` [Bug tree-optimization/110931] " pinskia at gcc dot gnu.org
2023-08-07 15:11 ` pinskia at gcc dot gnu.org
2023-08-07 15:25 ` pinskia at gcc dot gnu.org [this message]
2023-08-07 16:07 ` pinskia at gcc dot gnu.org
2023-08-09  1:35 ` pinskia at gcc dot gnu.org
2024-03-07 23:25 ` law at gcc dot gnu.org
2024-03-09  6:50 ` law at gcc dot gnu.org
2024-05-07  7:41 ` [Bug tree-optimization/110931] [14/15 " rguenth at gcc dot gnu.org

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