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* [Bug c/26213] New: new (within last few days) infinite loop with -O1
@ 2006-02-10 14:10 list+gcc-bugzilla at meyering dot net
2006-02-10 14:24 ` [Bug tree-optimization/26213] [4.2 Regression] " pinskia at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: list+gcc-bugzilla at meyering dot net @ 2006-02-10 14:10 UTC (permalink / raw)
To: gcc-bugs
gcc infloops with -O1 (but not -O, -Os, -O2, or -O3) given the following input.
Note that this happens using gcc built from svn a few hours ago, that it is
also reproducible with a two-day-old binary, but not with one from 2006-02-04.
$ cat xnanosleep.c
void
xnanosleep (_Bool overflow)
{
struct { int tv_nsec; } ts_sleep;
if (0 <= ts_sleep.tv_nsec)
overflow |= 1;
for (;;)
{
if (overflow)
ts_sleep.tv_nsec = 0;
if (foo (ts_sleep))
break;
}
}
$ time gcc -v -O1 xnanosleep.c 2> /t/err
gcc -v -O1 xnanosleep.c 2> /t/err 0.00s user 0.00s system 0% cpu 5.106 total
[Exit 130 (INT)]
$ cat /t/err
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: /mirror/d/gcc/configure --disable-nls
--prefix=/p/p/gcc-2006-02-10.10h41 --disable-multilib --enable-languages=c
Thread model: posix
gcc version 4.2.0 20060210 (experimental)
/nobak/p/p/gcc-2006-02-10.10h41/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.2.0/cc1
-quiet -v -iprefix
/nobak/p/p/gcc-2006-02-10.10h41/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.2.0/
xnanosleep.c -quiet -dumpbase xnanosleep.c -mtune=generic -auxbase xnanosleep
-O1 -version -o /t/cc9XDV6L.s
ignoring nonexistent directory
"/nobak/p/p/gcc-2006-02-10.10h41/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.2.0/../../../../x86_64-unknown-linux-gnu/include"
ignoring duplicate directory
"/p/p/gcc-2006-02-10.10h41/lib/gcc/x86_64-unknown-linux-gnu/4.2.0/include"
ignoring nonexistent directory
"/p/p/gcc-2006-02-10.10h41/lib/gcc/x86_64-unknown-linux-gnu/4.2.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/nobak/p/p/gcc-2006-02-10.10h41/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.2.0/include
/usr/local/include
/p/p/gcc-2006-02-10.10h41/include
/usr/include
End of search list.
GNU C version 4.2.0 20060210 (experimental) (x86_64-unknown-linux-gnu)
compiled by GNU C version 4.2.0 20060210 (experimental).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: ddb06f39f2f5fb93ee768a85a3be125e
--
Summary: new (within last few days) infinite loop with -O1
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: list+gcc-bugzilla at meyering dot net
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26213
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/26213] [4.2 Regression] new (within last few days) infinite loop with -O1
2006-02-10 14:10 [Bug c/26213] New: new (within last few days) infinite loop with -O1 list+gcc-bugzilla at meyering dot net
@ 2006-02-10 14:24 ` pinskia at gcc dot gnu dot org
2006-02-10 16:19 ` law at redhat dot com
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-02-10 14:24 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pinskia at gcc dot gnu dot org 2006-02-10 14:24 -------
Confirmed, the backtrace:
#0 0x004c0784 in thread_across_edge (dummy_cond=0x41ee29f0, e=0x41ee24e0,
handle_dominating_asserts=0 '\0', stack=0x6c9530, simplify=0x422674
<simplify_stmt_for_jump_threading>) at
/Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-threadedge.c:445
#1 0x0042359c in dom_opt_finalize_block (walk_data=0x41ee24e0, bb=0x41ee21b0)
at /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-dom.c:722
#2 0x0042359c in dom_opt_finalize_block (walk_data=0xbffff80c, bb=0x41ee1930)
at /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-dom.c:722
#3 0x0049b044 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1930) at
/Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:234
#4 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1850) at
/Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
#5 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1770) at
/Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
#6 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee15b0) at
/Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu dot org
Status|UNCONFIRMED |NEW
Component|c |tree-optimization
Ever Confirmed|0 |1
GCC build triplet|x86_64-unknown-linux-gnu |
GCC host triplet|x86_64-unknown-linux-gnu |
GCC target triplet|x86_64-unknown-linux-gnu |
Keywords| |compile-time-hog
Last reconfirmed|0000-00-00 00:00:00 |2006-02-10 14:24:16
date| |
Summary|new (within last few days) |[4.2 Regression] new (within
|infinite loop with -O1 |last few days) infinite loop
| |with -O1
Target Milestone|--- |4.2.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26213
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/26213] [4.2 Regression] new (within last few days) infinite loop with -O1
2006-02-10 14:10 [Bug c/26213] New: new (within last few days) infinite loop with -O1 list+gcc-bugzilla at meyering dot net
2006-02-10 14:24 ` [Bug tree-optimization/26213] [4.2 Regression] " pinskia at gcc dot gnu dot org
@ 2006-02-10 16:19 ` law at redhat dot com
2006-02-10 19:23 ` law at redhat dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: law at redhat dot com @ 2006-02-10 16:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from law at redhat dot com 2006-02-10 16:19 -------
Subject: Re: [4.2 Regression] new (within
last few days) infinite loop with -O1
On Fri, 2006-02-10 at 14:24 +0000, pinskia at gcc dot gnu dot org wrote:
>
> ------- Comment #1 from pinskia at gcc dot gnu dot org 2006-02-10 14:24 -------
> Confirmed, the backtrace:
> #0 0x004c0784 in thread_across_edge (dummy_cond=0x41ee29f0, e=0x41ee24e0,
> handle_dominating_asserts=0 '\0', stack=0x6c9530, simplify=0x422674
> <simplify_stmt_for_jump_threading>) at
> /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-threadedge.c:445
> #1 0x0042359c in dom_opt_finalize_block (walk_data=0x41ee24e0, bb=0x41ee21b0)
> at /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-dom.c:722
> #2 0x0042359c in dom_opt_finalize_block (walk_data=0xbffff80c, bb=0x41ee1930)
> at /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-dom.c:722
> #3 0x0049b044 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1930) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:234
> #4 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1850) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
> #5 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1770) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
> #6 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee15b0) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
Fix in testing.
jeff
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26213
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/26213] [4.2 Regression] new (within last few days) infinite loop with -O1
2006-02-10 14:10 [Bug c/26213] New: new (within last few days) infinite loop with -O1 list+gcc-bugzilla at meyering dot net
2006-02-10 14:24 ` [Bug tree-optimization/26213] [4.2 Regression] " pinskia at gcc dot gnu dot org
2006-02-10 16:19 ` law at redhat dot com
@ 2006-02-10 19:23 ` law at redhat dot com
2006-02-10 19:23 ` law at gcc dot gnu dot org
2006-02-10 23:08 ` pinskia at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: law at redhat dot com @ 2006-02-10 19:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from law at redhat dot com 2006-02-10 19:23 -------
Subject: Re: [4.2 Regression] new (within
last few days) infinite loop with -O1
On Fri, 2006-02-10 at 14:24 +0000, pinskia at gcc dot gnu dot org wrote:
>
> ------- Comment #1 from pinskia at gcc dot gnu dot org 2006-02-10 14:24 -------
> Confirmed, the backtrace:
> #0 0x004c0784 in thread_across_edge (dummy_cond=0x41ee29f0, e=0x41ee24e0,
> handle_dominating_asserts=0 '\0', stack=0x6c9530, simplify=0x422674
> <simplify_stmt_for_jump_threading>) at
> /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-threadedge.c:445
> #1 0x0042359c in dom_opt_finalize_block (walk_data=0x41ee24e0, bb=0x41ee21b0)
> at /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-dom.c:722
> #2 0x0042359c in dom_opt_finalize_block (walk_data=0xbffff80c, bb=0x41ee1930)
> at /Users/pinskia/src/gcc/local/gcc/gcc/tree-ssa-dom.c:722
> #3 0x0049b044 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1930) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:234
> #4 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1850) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
> #5 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee1770) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
> #6 0x0049aff0 in walk_dominator_tree (walk_data=0xbffff80c, bb=0x41ee15b0) at
> /Users/pinskia/src/gcc/local/gcc/gcc/domwalk.c:212
I should have known better. It's possible to have loops in the
SSA_NAME_VALUE chain. Dumb dumb dumb.
Bootstrapped and regression tested on i686-pc-linux-gnu.
------- Comment #5 from law at redhat dot com 2006-02-10 19:23 -------
Created an attachment (id=10818)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10818&action=view)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26213
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/26213] [4.2 Regression] new (within last few days) infinite loop with -O1
2006-02-10 14:10 [Bug c/26213] New: new (within last few days) infinite loop with -O1 list+gcc-bugzilla at meyering dot net
` (2 preceding siblings ...)
2006-02-10 19:23 ` law at redhat dot com
@ 2006-02-10 19:23 ` law at gcc dot gnu dot org
2006-02-10 23:08 ` pinskia at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: law at gcc dot gnu dot org @ 2006-02-10 19:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from law at gcc dot gnu dot org 2006-02-10 19:23 -------
Subject: Bug 26213
Author: law
Date: Fri Feb 10 19:22:58 2006
New Revision: 110846
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=110846
Log:
PR tree-optimization/26213
* tree-ssa-threadedge.c (simplify_control_stmt_condition): Do not
loop trying to follow SSA_NAME_VALUE chains.
* gcc.c-torture/compile/pr26213.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/compile/pr26213.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-threadedge.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26213
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug tree-optimization/26213] [4.2 Regression] new (within last few days) infinite loop with -O1
2006-02-10 14:10 [Bug c/26213] New: new (within last few days) infinite loop with -O1 list+gcc-bugzilla at meyering dot net
` (3 preceding siblings ...)
2006-02-10 19:23 ` law at gcc dot gnu dot org
@ 2006-02-10 23:08 ` pinskia at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-02-10 23:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from pinskia at gcc dot gnu dot org 2006-02-10 23:08 -------
Fixed.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26213
^ permalink raw reply [flat|nested] 6+ messages in thread
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2006-02-10 14:10 [Bug c/26213] New: new (within last few days) infinite loop with -O1 list+gcc-bugzilla at meyering dot net
2006-02-10 14:24 ` [Bug tree-optimization/26213] [4.2 Regression] " pinskia at gcc dot gnu dot org
2006-02-10 16:19 ` law at redhat dot com
2006-02-10 19:23 ` law at redhat dot com
2006-02-10 19:23 ` law at gcc dot gnu dot org
2006-02-10 23:08 ` pinskia at gcc dot gnu dot org
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