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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/66951] New: ICE at -O3 on x86_64-linux-gnu, verify_ssa failed
Date: Mon, 20 Jul 2015 19:44:00 -0000 [thread overview]
Message-ID: <bug-66951-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66951
Bug ID: 66951
Summary: ICE at -O3 on x86_64-linux-gnu, verify_ssa failed
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The following code causes an ICE when compiled with the current gcc trunk at
-O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 5.1.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150719 (experimental) [trunk revision 225987] (GCC)
$
$ gcc-trunk -O2 -c small.c
$ gcc-5.1 -O3 -c small.c
$
$ gcc-trunk -O3 -c small.c
small.c: In function ‘fn1’:
small.c:4:1: error: definition in block 18 does not dominate use in block 9
fn1 ()
^
for SSA_NAME: .MEM_48 in statement:
# VUSE <.MEM_48>
vect__9.18_58 = MEM[(int *)vectp_b.16_56];
small.c:4:1: internal compiler error: verify_ssa failed
0xd6a819 verify_ssa(bool, bool)
../../gcc-trunk/gcc/tree-ssa.c:1047
0xaaea3d execute_function_todo
../../gcc-trunk/gcc/passes.c:1955
0xaaf253 execute_todo
../../gcc-trunk/gcc/passes.c:2005
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$
--------------------------------
int a, b[16], c, d;
void
fn1 ()
{
for (; d; d++)
{
for (a = 0; a < 2; a++)
;
c ^= b[d];
}
}
>From gcc-bugs-return-492861-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jul 20 19:50:20 2015
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/66949] [6 Regression] ICE at -O2 and -O3 on x86_64-linux-gnu in tree_ssa_phiopt_worker, at tree-ssa-phiopt.c:335
Date: Mon, 20 Jul 2015 19:50:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 6.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: mpolacek at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution:
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 6.0
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_status cf_reconfirmed_on cc target_milestone short_desc everconfirmed
Message-ID: <bug-66949-4-kOzh2v46vL@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-66949-4@http.gcc.gnu.org/bugzilla/>
References: <bug-66949-4@http.gcc.gnu.org/bugzilla/>
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Auto-Submitted: auto-generated
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf949
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-07-20
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |6.0
Summary|ICE at -O2 and -O3 on |[6 Regression] ICE at -O2
|x86_64-linux-gnu in |and -O3 on x86_64-linux-gnu
|tree_ssa_phiopt_worker, at |in tree_ssa_phiopt_worker,
|tree-ssa-phiopt.c:335 |at tree-ssa-phiopt.c:335
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
next reply other threads:[~2015-07-20 19:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-20 19:44 su at cs dot ucdavis.edu [this message]
2015-07-20 19:51 ` [Bug tree-optimization/66951] [6 Regression] " mpolacek at gcc dot gnu.org
2015-07-20 20:26 ` mpolacek at gcc dot gnu.org
2015-07-26 9:32 ` pinskia at gcc dot gnu.org
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