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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/49847] [4.7 Regression] NULL deref in fold_rtx (prev_insn_cc0 == NULL)
Date: Wed, 29 Feb 2012 19:19:00 -0000 [thread overview]
Message-ID: <bug-49847-4-FmoFfFIbV6@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-49847-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49847
--- Comment #17 from Mikael Pettersson <mikpe at it dot uu.se> 2012-02-29 19:13:12 UTC ---
(In reply to comment #16)
> Created attachment 26757 [details]
> make fold_rtx handle prev_insn_cc0 == NULL
>
> The effect of Richard Guenther's r180192 patch to tree-eh.c is that "g >= 0.0"
> (or its gimple equivalent) is recognized as potentially trapping, which causes
> the cc0 setter and user to be put in separate BBs. That's usually a no-no, but
> in the case of EH I'm not sure it can be avoided. Then as fold_rtx processes
> the cc0 user at the start of the second BB, prev_insn_cc0 is NULL causing
> equiv_constant to crash.
>
> With the attached patch fold_rtx simply doesn't try to fold the current rtx
> when prev_insn_cc0 is NULL. A build of 4.7-20120225 as a cross to m68k-linux
> with java enabled succeeded with this patch applied, and it handled Andreas'
> c++ test case too. I'm currently attempting a native bootstrap with both java
> and ada enabled.
The native bootstrap succeeded.
next prev parent reply other threads:[~2012-02-29 19:13 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-25 21:07 [Bug java/49847] New: m68k gcj-4.6 " tg at mirbsd dot org
2011-09-03 19:32 ` [Bug java/49847] " tg at mirbsd dot org
2011-12-12 10:02 ` mikpe at it dot uu.se
2011-12-15 21:01 ` [Bug rtl-optimization/49847] [4.6/4.7 Regression] " pinskia at gcc dot gnu.org
2011-12-16 9:18 ` jakub at gcc dot gnu.org
2012-01-20 22:07 ` mikpe at it dot uu.se
2012-01-21 16:13 ` tg at mirbsd dot org
2012-01-22 2:16 ` mikpe at it dot uu.se
2012-01-22 10:33 ` schwab@linux-m68k.org
2012-01-22 12:29 ` schwab@linux-m68k.org
2012-01-22 13:02 ` schwab@linux-m68k.org
2012-01-22 13:39 ` mikpe at it dot uu.se
2012-01-22 14:36 ` schwab@linux-m68k.org
2012-01-23 13:41 ` schwab@linux-m68k.org
2012-01-23 16:37 ` [Bug rtl-optimization/49847] [4.7 Regression] " schwab@linux-m68k.org
2012-01-23 20:22 ` schwab@linux-m68k.org
2012-02-05 21:57 ` mikpe at it dot uu.se
2012-02-07 15:50 ` mikpe at it dot uu.se
2012-02-26 22:37 ` mikpe at it dot uu.se
2012-02-29 19:19 ` mikpe at it dot uu.se [this message]
2012-03-22 8:43 ` [Bug rtl-optimization/49847] [4.7/4.8 " rguenth at gcc dot gnu.org
2012-06-14 8:22 ` rguenth at gcc dot gnu.org
2012-09-20 10:18 ` jakub at gcc dot gnu.org
2013-04-11 8:00 ` [Bug rtl-optimization/49847] [4.7/4.8/4.9 " rguenth at gcc dot gnu.org
2013-07-19 13:26 ` schwab@linux-m68k.org
2013-07-29 20:57 ` tg at mirbsd dot org
2014-02-07 22:58 ` law at redhat dot com
2014-02-14 18:39 ` law at redhat dot com
2014-02-15 13:13 ` steven at gcc dot gnu.org
2014-02-15 14:22 ` schwab@linux-m68k.org
2014-02-15 18:59 ` rguenther at suse dot de
2014-02-16 13:17 ` jackie.rosen at hushmail dot com
2014-02-17 10:01 ` rguenther at suse dot de
2014-02-25 6:14 ` law at redhat dot com
2014-02-25 8:41 ` rguenther at suse dot de
2014-02-27 19:03 ` law at gcc dot gnu.org
2014-06-12 13:43 ` [Bug rtl-optimization/49847] [4.7/4.8 " rguenth at gcc dot gnu.org
2014-12-19 13:35 ` [Bug rtl-optimization/49847] [4.8 " jakub at gcc dot gnu.org
2015-01-19 22:35 ` law at redhat dot com
2015-01-20 8:16 ` rguenth at gcc dot gnu.org
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