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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/59387] [4.9 Regression] wrong code (hangs) at -Os on x86_64-linux-gnu
Date: Thu, 09 Jan 2014 09:34:00 -0000 [thread overview]
Message-ID: <bug-59387-4-MmK4T72wkb@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-59387-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59387
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #7)
> Unfortunately it triggers (sccp no longer optimizes) on quite a few
> testcases:
>
> gcc.c-torture/execute/pr58277-1.c
> gcc.c-torture/execute/pr58831.c
> gcc.c-torture/execute/pr59387.c
> gcc.dg/pr58010.c
> gcc.dg/torture/pr55481.c
> gcc.dg/torture/pr56366.c
> gcc.dg/torture/pr59058.c
> gcc.dg/torture/pr59245.c
> gcc.dg/tree-ssa/loop-32.c
> gcc.dg/tree-ssa/loop-33.c
> gcc.dg/tree-ssa/loop-35.c
> gcc.dg/tree-ssa/scev-6.c
>
> (the first test only for -m64, all the rest both -m32 and -m64, the last
> even FAILs because of that). Couldn't we just transform that somehow into
> an unsigned type computation instead in that case, at least for simple cases?
You could leverage the code I added to LIM ... in the case where SCEV folded
casts, of course.
next prev parent reply other threads:[~2014-01-09 9:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-04 18:41 [Bug tree-optimization/59387] New: " su at cs dot ucdavis.edu
2013-12-05 10:57 ` [Bug tree-optimization/59387] " rguenth at gcc dot gnu.org
2013-12-19 11:01 ` [Bug tree-optimization/59387] [4.9 Regression] " jakub at gcc dot gnu.org
2013-12-19 11:22 ` jakub at gcc dot gnu.org
2013-12-19 11:31 ` jakub at gcc dot gnu.org
2014-01-08 16:38 ` jakub at gcc dot gnu.org
2014-01-08 22:48 ` jakub at gcc dot gnu.org
2014-01-09 9:34 ` rguenth at gcc dot gnu.org [this message]
2014-01-10 14:56 ` jakub at gcc dot gnu.org
2014-01-13 19:14 ` jakub at gcc dot gnu.org
2014-01-15 21:43 ` law at redhat dot com
2014-01-16 19:15 ` jakub at gcc dot gnu.org
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