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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109154] [13 regression] jump threading de-optimizes nested floating point comparisons
Date: Mon, 27 Mar 2023 09:42:24 +0000 [thread overview]
Message-ID: <bug-109154-4-FtZ9M2HA8I@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-109154-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109154
--- Comment #13 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #12)
> (In reply to Aldy Hernandez from comment #10)
> > BTW, I don't think it helps at all here, but casting from l_10 to a float,
> > we know _1 can't be either -0.0 or +-INF or +-NAN. We could add a range-op
> > entry for NOP_EXPR / CONVERT_EXPR to expose this fact. Well, at the very
> > least that it can't be a NAN...in the current representation for frange's.
>
> We definitely should add range-ops for conversions from integral to floating
> point and from floating to integral and their reverses. But until we have
> more than one range, if the integral value is VARYING, for 32-bit signed int
> the range would be
> [-0x1.p+31, 0x1.p+31] so nothing specific around zero. With 3+ ranges we
> could make it
> [-0x1.p+31, -1.][0., 0.][1., 0x1.p+31] if we think normal values around zero
> are important special cases.
Ultimately we want "unlimited" sub-ranges like we have for int_range_max, but
who knows what pandora's box that will open :-/.
next prev parent reply other threads:[~2023-03-27 9:42 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-16 11:57 [Bug tree-optimization/109154] New: [13 regression] aarch64 -mcpu=neoverse-v1 microbude performance regression pgodbole at nvidia dot com
2023-03-16 13:11 ` [Bug tree-optimization/109154] " tnfchris at gcc dot gnu.org
2023-03-16 14:58 ` [Bug target/109154] " rguenth at gcc dot gnu.org
2023-03-16 17:03 ` tnfchris at gcc dot gnu.org
2023-03-16 17:03 ` [Bug target/109154] [13 regression] jump threading with de-optimizes nested floating point comparisons tnfchris at gcc dot gnu.org
2023-03-22 10:20 ` [Bug tree-optimization/109154] [13 regression] jump threading " aldyh at gcc dot gnu.org
2023-03-22 10:29 ` avieira at gcc dot gnu.org
2023-03-22 12:22 ` rguenth at gcc dot gnu.org
2023-03-22 12:42 ` rguenth at gcc dot gnu.org
2023-03-22 13:11 ` aldyh at gcc dot gnu.org
2023-03-22 14:00 ` amacleod at redhat dot com
2023-03-22 14:39 ` aldyh at gcc dot gnu.org
2023-03-27 8:09 ` rguenth at gcc dot gnu.org
2023-03-27 9:30 ` jakub at gcc dot gnu.org
2023-03-27 9:42 ` aldyh at gcc dot gnu.org [this message]
2023-03-27 9:44 ` jakub at gcc dot gnu.org
2023-03-27 10:18 ` rguenther at suse dot de
2023-03-27 10:40 ` jakub at gcc dot gnu.org
2023-03-27 10:44 ` jakub at gcc dot gnu.org
2023-03-27 10:54 ` rguenth at gcc dot gnu.org
2023-03-27 10:56 ` jakub at gcc dot gnu.org
2023-03-27 10:59 ` jakub at gcc dot gnu.org
2023-03-27 17:07 ` jakub at gcc dot gnu.org
2023-03-28 8:33 ` rguenth at gcc dot gnu.org
2023-03-28 9:01 ` cvs-commit at gcc dot gnu.org
2023-03-28 10:07 ` tnfchris at gcc dot gnu.org
2023-03-28 10:08 ` tnfchris at gcc dot gnu.org
2023-03-28 12:18 ` jakub at gcc dot gnu.org
2023-03-28 12:25 ` rguenth at gcc dot gnu.org
2023-03-28 12:42 ` rguenth at gcc dot gnu.org
2023-03-28 13:19 ` rguenth at gcc dot gnu.org
2023-03-28 13:44 ` jakub at gcc dot gnu.org
2023-03-28 13:52 ` jakub at gcc dot gnu.org
2023-03-28 15:31 ` amacleod at redhat dot com
2023-03-28 15:40 ` jakub at gcc dot gnu.org
2023-03-28 15:53 ` amacleod at redhat dot com
2023-03-28 15:58 ` jakub at gcc dot gnu.org
2023-03-28 16:42 ` amacleod at redhat dot com
2023-03-28 21:12 ` amacleod at redhat dot com
2023-03-29 6:33 ` cvs-commit at gcc dot gnu.org
2023-03-29 6:38 ` rguenth at gcc dot gnu.org
2023-03-29 22:41 ` amacleod at redhat dot com
2023-03-30 18:17 ` cvs-commit at gcc dot gnu.org
2023-04-05 9:28 ` tnfchris at gcc dot gnu.org
2023-04-05 9:34 ` ktkachov at gcc dot gnu.org
2023-04-11 9:36 ` rguenth at gcc dot gnu.org
2023-04-13 16:54 ` jakub at gcc dot gnu.org
2023-04-13 17:25 ` rguenther at suse dot de
2023-04-13 17:29 ` jakub at gcc dot gnu.org
2023-04-14 18:10 ` jakub at gcc dot gnu.org
2023-04-14 18:14 ` jakub at gcc dot gnu.org
2023-04-14 18:22 ` jakub at gcc dot gnu.org
2023-04-14 19:09 ` jakub at gcc dot gnu.org
2023-04-15 10:10 ` cvs-commit at gcc dot gnu.org
2023-04-17 11:07 ` jakub at gcc dot gnu.org
2023-04-25 18:32 ` [Bug tree-optimization/109154] [13/14 " tnfchris at gcc dot gnu.org
2023-04-25 18:34 ` jakub at gcc dot gnu.org
2023-04-26 6:58 ` rguenth at gcc dot gnu.org
2023-04-26 9:43 ` tnfchris at gcc dot gnu.org
2023-04-26 10:07 ` jakub at gcc dot gnu.org
2023-07-07 18:10 ` tnfchris at gcc dot gnu.org
2023-07-10 7:15 ` rguenth at gcc dot gnu.org
2023-07-10 10:33 ` tnfchris at gcc dot gnu.org
2023-07-10 10:46 ` rguenth at gcc dot gnu.org
2023-07-10 11:02 ` tnfchris at gcc dot gnu.org
2023-07-10 11:27 ` rguenth at gcc dot gnu.org
2023-07-10 11:49 ` tnfchris at gcc dot gnu.org
2023-07-14 10:22 ` cvs-commit at gcc dot gnu.org
2023-07-14 10:22 ` cvs-commit at gcc dot gnu.org
2023-07-27 9:25 ` rguenth at gcc dot gnu.org
2023-10-02 10:53 ` cvs-commit at gcc dot gnu.org
2023-10-18 8:54 ` cvs-commit at gcc dot gnu.org
2023-10-18 8:54 ` cvs-commit at gcc dot gnu.org
2023-10-18 8:54 ` cvs-commit at gcc dot gnu.org
2023-10-18 8:55 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:20 ` cvs-commit at gcc dot gnu.org
2023-11-09 14:25 ` [Bug tree-optimization/109154] [13 " tnfchris at gcc dot gnu.org
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