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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/104582] [11/12 Regression] Unoptimal code for __negdi2 (and others) from libgcc2 due to unwanted vectorization
Date: Fri, 18 Feb 2022 21:16:30 +0000 [thread overview]
Message-ID: <bug-104582-4-9P4jW4xF2p@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-104582-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104582
--- Comment #18 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #6)
> Hmm:
> _14 = {_1, _5};
> _8 = VIEW_CONVERT_EXPR<__int128>(_14);
>
> Wouldn't it better to convert that to just (hopefully I got the order
> correct):
> t1 = (__128)_1
> _8 = BIT_INSERT_EXPR(t1, 64, _5);
>
> ?
I filed that as PR 104600 since it might be useful in the general case too.
next prev parent reply other threads:[~2022-02-18 21:16 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-17 12:30 [Bug target/104582] New: Unoptimal code for __negdi2 (and others) from libgcc2 ubizjak at gmail dot com
2022-02-17 12:35 ` [Bug tree-optimization/104582] " ubizjak at gmail dot com
2022-02-17 12:45 ` ubizjak at gmail dot com
2022-02-17 15:28 ` [Bug tree-optimization/104582] [11/12 Regression] Unoptimal code for __negdi2 (and others) from libgcc2 due to unwanted vectorization jakub at gcc dot gnu.org
2022-02-17 16:35 ` jakub at gcc dot gnu.org
2022-02-17 16:40 ` jakub at gcc dot gnu.org
2022-02-18 0:43 ` pinskia at gcc dot gnu.org
2022-02-18 7:26 ` rguenth at gcc dot gnu.org
2022-02-18 8:37 ` jakub at gcc dot gnu.org
2022-02-18 8:48 ` rguenth at gcc dot gnu.org
2022-02-18 8:53 ` rguenth at gcc dot gnu.org
2022-02-18 9:02 ` jakub at gcc dot gnu.org
2022-02-18 9:28 ` rguenther at suse dot de
2022-02-18 10:19 ` rguenth at gcc dot gnu.org
2022-02-18 10:22 ` rguenth at gcc dot gnu.org
2022-02-18 10:50 ` rguenth at gcc dot gnu.org
2022-02-18 11:31 ` rguenth at gcc dot gnu.org
2022-02-18 13:37 ` rguenth at gcc dot gnu.org
2022-02-18 13:45 ` rguenth at gcc dot gnu.org
2022-02-18 21:16 ` pinskia at gcc dot gnu.org [this message]
2022-02-22 7:58 ` cvs-commit at gcc dot gnu.org
2022-02-22 7:59 ` cvs-commit at gcc dot gnu.org
2022-02-22 7:59 ` cvs-commit at gcc dot gnu.org
2022-02-22 7:59 ` [Bug tree-optimization/104582] [11 " rguenth at gcc dot gnu.org
2022-04-07 8:15 ` rguenth at gcc dot gnu.org
2022-04-21 7:51 ` rguenth at gcc dot gnu.org
2023-05-29 10:06 ` jakub at gcc dot gnu.org
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