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* [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
@ 2013-11-01 5:25 su at cs dot ucdavis.edu
2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-11-01 5:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
Bug ID: 58957
Summary: compilation hangs at -O3 on x86_64-linux-gnu (both
32-bit and 64-bit modes)
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The following code causes gcc 4.8.2 (as well as gcc 4.8.0 and gcc 4.8.1) to
hang at -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It doesn't affect gcc trunk, 4.7.x, and 4.6.x.
$ gcc-trunk -O3 small.c
$ gcc-4.6 -O3 small.c
$ gcc-4.7 -O3 small.c
$
$ gcc-4.8 -O3 small.c
^C
$
$ gcc-4.8 -v
Using built-in specs.
COLLECT_GCC=gcc-4.8
COLLECT_LTO_WRAPPER=/usr/local/gcc-4.8.2/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.8.2/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.8.2/configure
--enable-languages=c,c++,objc,obj-c++,fortran,lto --enable-checking=release
--with-gmp=/home/su/software/local/gcc-4.8.2
--with-mpfr=/home/su/software/local/gcc-4.8.2
--with-mpc=/home/su/software/local/gcc-4.8.2
--with-cloog=/home/su/software/local/gcc-4.8.2
--prefix=/home/su/software/local/gcc-4.8.2
Thread model: posix
gcc version 4.8.2 (GCC)
$
----------------------------------
void __assert_fail () __attribute__ ((__noreturn__));
int a[10], b, c, d, *e, **f = &e, g, i, *j;
unsigned int h;
int *
foo ()
{
for (c = 0; c < 10; c++)
for (i = 1; i >= 0; i--)
for (d = 0; d < 10; d++)
{
j = &a[d];
j >= &a[0] && j <= &a[9] ? (void) 0 : __assert_fail ();
}
return &b;
}
int
main ()
{
for (g = 3; g < 10; g++)
for (; h < 10; h++)
*f = foo ();
return 0;
}
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu
@ 2013-11-04 14:36 ` rguenth at gcc dot gnu.org
2013-11-04 23:21 ` su at cs dot ucdavis.edu
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-04 14:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog
Known to work| |4.7.3, 4.9.0
Summary|[4.8 Regression] |[4.8 Regression]
|compilation hangs at -O3 on |compilation slow at -O3 on
|x86_64-linux-gnu (both |x86_64-linux-gnu (both
|32-bit and 64-bit modes) |32-bit and 64-bit modes)
Known to fail| |4.8.0, 4.8.2
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think it's just awfully slow (deep loop nest, possible to unroll completely).
It terminates for me on the branch and for 4.8.2 and 4.8.1.
tree CFG cleanup : 8.49 (88%) usr 0.00 ( 0%) sys 8.52 (87%) wall
783 kB ( 2%) ggc
TOTAL : 9.70 0.06 9.80
51528 kB
on trunk and 4.7.3:
TOTAL : 0.09 0.00 0.10
1865 kB
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu
2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org
@ 2013-11-04 23:21 ` su at cs dot ucdavis.edu
2014-12-10 12:48 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-11-04 23:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
--- Comment #3 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Richard Biener from comment #2)
> I think it's just awfully slow (deep loop nest, possible to unroll
> completely).
> It terminates for me on the branch and for 4.8.2 and 4.8.1.
>
> tree CFG cleanup : 8.49 (88%) usr 0.00 ( 0%) sys 8.52 (87%)
> wall 783 kB ( 2%) ggc
> TOTAL : 9.70 0.06 9.80
> 51528 kB
>
> on trunk and 4.7.3:
>
> TOTAL : 0.09 0.00 0.10
> 1865 kB
You are right Richard --- I didn't wait long enough.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu
2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org
2013-11-04 23:21 ` su at cs dot ucdavis.edu
@ 2014-12-10 12:48 ` rguenth at gcc dot gnu.org
2014-12-19 13:42 ` jakub at gcc dot gnu.org
2015-06-23 8:46 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-12-10 12:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2014-12-10 12:48 ` rguenth at gcc dot gnu.org
@ 2014-12-19 13:42 ` jakub at gcc dot gnu.org
2015-06-23 8:46 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2014-12-19 13:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.8.4 |4.8.5
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.4 has been released.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/58957] [4.8 Regression] compilation slow at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu
` (3 preceding siblings ...)
2014-12-19 13:42 ` jakub at gcc dot gnu.org
@ 2015-06-23 8:46 ` rguenth at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-06-23 8:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58957
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|4.8.5 |4.9.0
Known to fail| |4.8.5
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed for 4.9.0.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2015-06-23 8:44 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2013-11-01 5:25 [Bug tree-optimization/58957] New: compilation hangs at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes) su at cs dot ucdavis.edu
2013-11-04 14:36 ` [Bug tree-optimization/58957] [4.8 Regression] compilation slow " rguenth at gcc dot gnu.org
2013-11-04 23:21 ` su at cs dot ucdavis.edu
2014-12-10 12:48 ` rguenth at gcc dot gnu.org
2014-12-19 13:42 ` jakub at gcc dot gnu.org
2015-06-23 8:46 ` rguenth at gcc dot gnu.org
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