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* [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu
@ 2015-02-26 1:19 su at cs dot ucdavis.edu
2015-02-26 3:15 ` [Bug tree-optimization/65216] " ktietz at gcc dot gnu.org
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: su at cs dot ucdavis.edu @ 2015-02-26 1:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Bug ID: 65216
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The current gcc trunk miscompiles the following code on x86_64-linux at -O3 in
both 32-bit and 64-bit modes.
This is a regression from 4.9.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/5.0.0/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 5.0.0 20150225 (experimental) [trunk revision 220958] (GCC)
$
$ gcc-trunk -O2 small.c; a.out
$ gcc-4.9 -O3 small.c; a.out
$
$ gcc-trunk -O3 small.c
$ ./a.out
Aborted (core dumped)
$
--------------------------------------
int a, b = 62, e;
volatile int c;
volatile int d;
int
main ()
{
int f = a = 0;
for (; a < 2; a++)
{
b &= (8 ^ f) & 1;
for (e = 0; e < 6; e++)
if (c)
f = d;
}
if (b != 0)
__builtin_abort ();
return 0;
}
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2015-02-26 3:15 ` ktietz at gcc dot gnu.org
2015-02-26 3:45 ` glisse at gcc dot gnu.org
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: ktietz at gcc dot gnu.org @ 2015-02-26 3:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Kai Tietz <ktietz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-02-25
CC| |ktietz at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Kai Tietz <ktietz at gcc dot gnu.org> ---
Confirmed. The & 1 gets lost by pass vrp2
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-02-26 3:15 ` [Bug tree-optimization/65216] " ktietz at gcc dot gnu.org
@ 2015-02-26 3:45 ` glisse at gcc dot gnu.org
2015-02-26 5:26 ` [Bug tree-optimization/65216] [5 Regression] " ktietz at gcc dot gnu.org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: glisse at gcc dot gnu.org @ 2015-02-26 3:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
The ranges are wrong before VRP2. Reassoc2 does something suspicious...
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-02-26 3:15 ` [Bug tree-optimization/65216] " ktietz at gcc dot gnu.org
2015-02-26 3:45 ` glisse at gcc dot gnu.org
@ 2015-02-26 5:26 ` ktietz at gcc dot gnu.org
2015-02-26 8:39 ` jakub at gcc dot gnu.org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: ktietz at gcc dot gnu.org @ 2015-02-26 5:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Kai Tietz <ktietz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |5.0
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2015-02-26 5:26 ` [Bug tree-optimization/65216] [5 Regression] " ktietz at gcc dot gnu.org
@ 2015-02-26 8:39 ` jakub at gcc dot gnu.org
2015-02-26 10:14 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-26 8:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
CC| |jakub at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r220164, will have a look.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (3 preceding siblings ...)
2015-02-26 8:39 ` jakub at gcc dot gnu.org
@ 2015-02-26 10:14 ` rguenth at gcc dot gnu.org
2015-02-26 12:49 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-02-26 10:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> Started with r220164, will have a look.
Yeah, I also pushed this to make issues like this pop up so we can fix them
(VRP is really the pass that should expose bogus range info best).
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (4 preceding siblings ...)
2015-02-26 10:14 ` rguenth at gcc dot gnu.org
@ 2015-02-26 12:49 ` jakub at gcc dot gnu.org
2015-02-27 0:12 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-26 12:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 34883
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34883&action=edit
gcc5-pr65216.patch
Untested fix.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (5 preceding siblings ...)
2015-02-26 12:49 ` jakub at gcc dot gnu.org
@ 2015-02-27 0:12 ` jakub at gcc dot gnu.org
2015-02-27 0:25 ` jakub at gcc dot gnu.org
2015-03-04 12:30 ` ktietz at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-27 0:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Feb 26 21:03:14 2015
New Revision: 221034
URL: https://gcc.gnu.org/viewcvs?rev=221034&root=gcc&view=rev
Log:
PR tree-optimization/65216
* tree-ssa-reassoc.c (rewrite_expr_tree): Force creation of
new stmt and new SSA_NAME for lhs whenever the arguments have
changed and weren't just swapped. Fix comment typo.
* gcc.c-torture/execute/pr65216.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr65216.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-reassoc.c
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (6 preceding siblings ...)
2015-02-27 0:12 ` jakub at gcc dot gnu.org
@ 2015-02-27 0:25 ` jakub at gcc dot gnu.org
2015-03-04 12:30 ` ktietz at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2015-02-27 0:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/65216] [5 Regression] wrong code at -O3 on x86_64-linux-gnu
2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (7 preceding siblings ...)
2015-02-27 0:25 ` jakub at gcc dot gnu.org
@ 2015-03-04 12:30 ` ktietz at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: ktietz at gcc dot gnu.org @ 2015-03-04 12:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65216
Kai Tietz <ktietz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |madars+gccbug at gmail dot com
--- Comment #8 from Kai Tietz <ktietz at gcc dot gnu.org> ---
*** Bug 65307 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2015-03-04 12:30 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
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2015-02-26 1:19 [Bug tree-optimization/65216] New: wrong code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-02-26 3:15 ` [Bug tree-optimization/65216] " ktietz at gcc dot gnu.org
2015-02-26 3:45 ` glisse at gcc dot gnu.org
2015-02-26 5:26 ` [Bug tree-optimization/65216] [5 Regression] " ktietz at gcc dot gnu.org
2015-02-26 8:39 ` jakub at gcc dot gnu.org
2015-02-26 10:14 ` rguenth at gcc dot gnu.org
2015-02-26 12:49 ` jakub at gcc dot gnu.org
2015-02-27 0:12 ` jakub at gcc dot gnu.org
2015-02-27 0:25 ` jakub at gcc dot gnu.org
2015-03-04 12:30 ` ktietz at gcc dot gnu.org
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