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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/79119] absolute value of a pointer difference can be assumed to be less than or equal to PTRDIFF_MAX
Date: Sat, 06 May 2023 20:20:35 +0000 [thread overview]
Message-ID: <bug-79119-4-9B63XFG3Lw@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-79119-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79119
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=94274
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> So a couple of things need to happen really:
> optimized now:
> if (p_10 < q_12)
> goto <bb 3>; [50.00%]
> else
> goto <bb 4>; [50.00%]
>
> <bb 3> [local count: 536870913]:
> _3 = _22 - _21;
> _4 = _3 /[ex] 4;
> iftmp.0_14 = (long unsigned int) _4;
> goto <bb 5>; [100.00%]
>
> <bb 4> [local count: 536870913]:
> _5 = _21 - _22;
> _6 = _5 /[ex] 4;
> iftmp.0_13 = (long unsigned int) _6;
>
> <bb 5> [local count: 1073741824]:
> # iftmp.0_7 = PHI <iftmp.0_14(3), iftmp.0_13(4)>
Most of that is PR 94274 .
prev parent reply other threads:[~2023-05-06 20:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-79119-4@http.gcc.gnu.org/bugzilla/>
2023-04-27 22:31 ` pinskia at gcc dot gnu.org
2023-05-02 0:15 ` pinskia at gcc dot gnu.org
2023-05-06 20:20 ` pinskia at gcc dot gnu.org [this message]
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