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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/68130] [6 Regression] gfortran.dg/ieee/ieee_2.f90 is miscomputed with '-Os -m32' on x86_64-apple-darwin14 after r228971
Date: Wed, 28 Oct 2015 13:36:00 -0000 [thread overview]
Message-ID: <bug-68130-4-2c8xcWS2WK@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-68130-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68130
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 28 Oct 2015, dominiq at lps dot ens.fr wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68130
>
> Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> Status|UNCONFIRMED |NEW
> Last reconfirmed| |2015-10-28
> Ever confirmed|0 |1
>
> --- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> > The PRE dump difference is pretty unreadable already. So I wonder if
> > the issue reproduces with -fno-tree-pre added. If not I wonder
> > if it reproduces with -fdisable-tree-fre2 or at least -fno-tree-tail-merge.
>
> The test succeeds with '-fno-tree-pre -fdisable-tree-fre2':
>
> [Book15] f90/bug% /opt/gcc/gcc6p-228971/bin/gfortran ieee_2_red_2.f90 -Os -m32
> -fno-tree-pre -fdisable-tree-fre2
> f951: note: disable pass tree-fre2 for functions in the range of [0,
> 4294967295]
> [Book15] f90/bug% a.out
> [Book15] f90/bug%
>
> but fails with the other options above.
Just double-checking - the test fails with -Os -m32 -fno-tree-pre. Then
the FRE2 transform I cited triggers the issue. Can you attach
-fdump-rtl-expand-details dumps with that options for both revs?
next prev parent reply other threads:[~2015-10-28 13:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-28 11:23 [Bug tree-optimization/68130] New: " dominiq at lps dot ens.fr
2015-10-28 11:24 ` [Bug tree-optimization/68130] " dominiq at lps dot ens.fr
2015-10-28 11:52 ` dominiq at lps dot ens.fr
2015-10-28 13:18 ` rguenth at gcc dot gnu.org
2015-10-28 13:27 ` dominiq at lps dot ens.fr
2015-10-28 13:36 ` rguenther at suse dot de [this message]
2015-10-28 13:53 ` dominiq at lps dot ens.fr
2015-10-28 13:54 ` dominiq at lps dot ens.fr
2015-10-28 17:01 ` dominiq at lps dot ens.fr
2015-10-28 17:45 ` [Bug tree-optimization/68130] [6 Regression] gfortran.dg/ieee/ieee_2.f90 is miscomputed with '-Os -m32' on x86_64-apple-darwin1* " dominiq at lps dot ens.fr
2015-10-29 23:07 ` dominiq at lps dot ens.fr
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