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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/94892] (x >> 31) + 1 not getting narrowed to compare
Date: Sun, 28 May 2023 23:15:43 +0000 [thread overview]
Message-ID: <bug-94892-4-JKyXUmCGWu@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94892-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94892
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #6)
> Two things we should simplify:
> _4 = _3 >> 31;
> _4 != -1
>
> Into:
> _3 >= 0 (if _3 is signed, otherwise false)
>
> (this will solve f0)
See bug 85234 comment #5 on handle that one (g and g2).
prev parent reply other threads:[~2023-05-28 23:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 17:25 [Bug tree-optimization/94892] New: " gabravier at gmail dot com
2020-04-30 18:34 ` [Bug target/94892] " pinskia at gcc dot gnu.org
2020-04-30 19:32 ` gabravier at gmail dot com
2020-05-01 19:28 ` harald at gigawatt dot nl
2020-08-10 0:19 ` gabravier at gmail dot com
2021-12-15 0:23 ` [Bug tree-optimization/94892] " pinskia at gcc dot gnu.org
2021-12-15 0:31 ` pinskia at gcc dot gnu.org
2023-05-28 23:15 ` pinskia at gcc dot gnu.org [this message]
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