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* [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu
@ 2013-11-21 1:32 su at cs dot ucdavis.edu
2013-11-21 12:18 ` [Bug tree-optimization/59221] [4.9 Regression] " rguenth at gcc dot gnu.org
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-11-21 1:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
Bug ID: 59221
Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu
Product: gcc
Version: 4.9.0
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 -O2 and
-O3 in both 32-bit and 64-bit modes.
This is a regression from 4.8.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/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure
--enable-languages=c,c++,objc,obj-c++,fortran,lto --disable-werror
--with-gmp=/usr/local/gcc-trunk --with-mpfr=/usr/local/gcc-trunk
--with-mpc=/usr/local/gcc-trunk --with-cloog=/usr/local/gcc-trunk
--prefix=/usr/local/gcc-trunk
Thread model: posix
gcc version 4.9.0 20131120 (experimental) [trunk revision 205097] (GCC)
$
$ gcc-trunk -Os small.c; a.out
$ gcc-4.8.2 -O2 small.c; a.out
$
$ gcc-trunk -O2 small.c; a.out
Aborted (core dumped)
$
-----------------------
int a = 1, b, d;
short e;
int
main ()
{
for (; b; b++)
;
short f = a;
int g = 15;
e = f ? f : 1 << g;
int h = e;
d = h == 83647 ? 0 : h;
if (d != 1)
__builtin_abort ();
return 0;
}
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2013-11-21 12:18 ` rguenth at gcc dot gnu.org
2013-11-21 15:06 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-21 12:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-11-21
Target Milestone|--- |4.9.0
Summary|wrong code at -O2 and -O3 |[4.9 Regression] wrong code
|on x86_64-linux-gnu |at -O2 and -O3 on
| |x86_64-linux-gnu
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed, disabling VRP fixes it.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2013-11-21 12:18 ` [Bug tree-optimization/59221] [4.9 Regression] " rguenth at gcc dot gnu.org
@ 2013-11-21 15:06 ` rguenth at gcc dot gnu.org
2013-11-21 15:57 ` hjl.tools at gmail dot com
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-21 15:06 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2013-11-21 12:18 ` [Bug tree-optimization/59221] [4.9 Regression] " rguenth at gcc dot gnu.org
2013-11-21 15:06 ` rguenth at gcc dot gnu.org
@ 2013-11-21 15:57 ` hjl.tools at gmail dot com
2013-11-21 16:56 ` law at redhat dot com
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: hjl.tools at gmail dot com @ 2013-11-21 15:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by r205074.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2013-11-21 15:57 ` hjl.tools at gmail dot com
@ 2013-11-21 16:56 ` law at redhat dot com
2013-11-21 19:45 ` law at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: law at redhat dot com @ 2013-11-21 16:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
Patch testing now.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (3 preceding siblings ...)
2013-11-21 16:56 ` law at redhat dot com
@ 2013-11-21 19:45 ` law at gcc dot gnu.org
2013-11-21 19:46 ` law at redhat dot com
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: law at gcc dot gnu.org @ 2013-11-21 19:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
--- Comment #5 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Nov 21 19:45:16 2013
New Revision: 205229
URL: http://gcc.gnu.org/viewcvs?rev=205229&root=gcc&view=rev
Log:
PR tree-optimization/59221
* tree-ssa-threadedge.c (thread_across_edge): Properly manage
temporary equivalences when threading through joiner blocks.
PR tree-optimization/59221
* gcc.c-torture/execute/pr59221.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr59221.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-threadedge.c
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (4 preceding siblings ...)
2013-11-21 19:45 ` law at gcc dot gnu.org
@ 2013-11-21 19:46 ` law at redhat dot com
2013-11-21 20:46 ` su at cs dot ucdavis.edu
2013-11-22 19:29 ` law at redhat dot com
7 siblings, 0 replies; 9+ messages in thread
From: law at redhat dot com @ 2013-11-21 19:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on trunk. Again, sorry for the breakage.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (5 preceding siblings ...)
2013-11-21 19:46 ` law at redhat dot com
@ 2013-11-21 20:46 ` su at cs dot ucdavis.edu
2013-11-22 19:29 ` law at redhat dot com
7 siblings, 0 replies; 9+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-11-21 20:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
--- Comment #7 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Jeffrey A. Law from comment #6)
> Fixed on trunk. Again, sorry for the breakage.
Thanks Jeff. That was quick!
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/59221] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu
2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
` (6 preceding siblings ...)
2013-11-21 20:46 ` su at cs dot ucdavis.edu
@ 2013-11-22 19:29 ` law at redhat dot com
7 siblings, 0 replies; 9+ messages in thread
From: law at redhat dot com @ 2013-11-22 19:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59221
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ro at gcc dot gnu.org
--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
*** Bug 59235 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 9+ messages in thread
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2013-11-21 1:32 [Bug tree-optimization/59221] New: wrong code at -O2 and -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2013-11-21 12:18 ` [Bug tree-optimization/59221] [4.9 Regression] " rguenth at gcc dot gnu.org
2013-11-21 15:06 ` rguenth at gcc dot gnu.org
2013-11-21 15:57 ` hjl.tools at gmail dot com
2013-11-21 16:56 ` law at redhat dot com
2013-11-21 19:45 ` law at gcc dot gnu.org
2013-11-21 19:46 ` law at redhat dot com
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