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* [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine
@ 2010-10-31 10:26 astrange at ithinksw dot com
2010-10-31 15:16 ` [Bug rtl-optimization/46248] " hjl.tools at gmail dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: astrange at ithinksw dot com @ 2010-10-31 10:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
Summary: 4.6 regression: crash+infinite recursion in combine
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: astrange@ithinksw.com
Created attachment 22210
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22210
source
gcc r166084 crashes compiling ffmpeg libpostproc on x86-64-apple-darwin10.
Minimized-ish source attached.
> gcc -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc46/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc46/libexec/gcc/x86_64-apple-darwin10.4.0/4.6.0/lto-wrapper
Target: x86_64-apple-darwin10.4.0
Configured with: ../../src/gcc/configure --prefix=/usr/local/gcc46
--with-arch=native --with-tune=native --disable-nls --with-gmp=/sw
--disable-bootstrap --enable-languages=c,c++,lto,objc,obj-c++
Thread model: posix
gcc version 4.6.0 20101030 (experimental) (GCC)
> gcc -O3 -S postprocess.i
gcc: internal compiler error: Segmentation fault (program cc1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
Backtrace:
#0 0x000000010031fc34 in if_then_else_cond (x=0x1425e14b0,
ptrue=0x7fff5f400078, pfalse=0x7fff5f400068) at
../../../src/gcc/gcc/combine.c:8471
#1 0x000000010031fd82 in if_then_else_cond (x=0x1425e1498,
ptrue=0x7fff5f400118, pfalse=0x7fff5f400108) at
../../../src/gcc/gcc/combine.c:8507
#2 0x000000010031fd82 in if_then_else_cond (x=0x1425e14b0,
ptrue=0x7fff5f4001b8, pfalse=0x7fff5f4001a8) at
../../../src/gcc/gcc/combine.c:8507
#3 0x000000010031fd82 in if_then_else_cond (x=0x1425e1498,
ptrue=0x7fff5f400258, pfalse=0x7fff5f400248) at
../../../src/gcc/gcc/combine.c:8507
#4 0x000000010031fd82 in if_then_else_cond (x=0x1425e14b0,
ptrue=0x7fff5f4002f8, pfalse=0x7fff5f4002e8) at
../../../src/gcc/gcc/combine.c:8507
#5 0x000000010031fd82 in if_then_else_cond (x=0x1425e1498,
ptrue=0x7fff5f400398, pfalse=0x7fff5f400388) at
../../../src/gcc/gcc/combine.c:8507
#6 0x000000010031fd82 in if_then_else_cond (x=0x1425e14b0,
ptrue=0x7fff5f400438, pfalse=0x7fff5f400428) at
../../../src/gcc/gcc/combine.c:8507
...
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/46248] 4.6 regression: crash+infinite recursion in combine
2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
@ 2010-10-31 15:16 ` hjl.tools at gmail dot com
2010-10-31 15:27 ` [Bug rtl-optimization/46248] [4.6 regression] " pinskia at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: hjl.tools at gmail dot com @ 2010-10-31 15:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2010.10.31 15:15:00
CC| |bernds at codesourcery dot
| |com, hjl.tools at gmail dot
| |com
Ever Confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-31 15:15:00 UTC ---
It is caused by revision 165674:
http://gcc.gnu.org/ml/gcc-cvs/2010-10/msg00859.html
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/46248] [4.6 regression] crash+infinite recursion in combine
2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
2010-10-31 15:16 ` [Bug rtl-optimization/46248] " hjl.tools at gmail dot com
@ 2010-10-31 15:27 ` pinskia at gcc dot gnu.org
2010-11-01 10:35 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2010-10-31 15:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Target Milestone|--- |4.6.0
Summary|4.6 regression: |[4.6 regression]
|crash+infinite recursion in |crash+infinite recursion in
|combine |combine
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-10-31 15:27:29 UTC ---
Related to PR 46212.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/46248] [4.6 regression] crash+infinite recursion in combine
2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
2010-10-31 15:16 ` [Bug rtl-optimization/46248] " hjl.tools at gmail dot com
2010-10-31 15:27 ` [Bug rtl-optimization/46248] [4.6 regression] " pinskia at gcc dot gnu.org
@ 2010-11-01 10:35 ` jakub at gcc dot gnu.org
2010-11-01 11:24 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2010-11-01 10:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot
| |gnu.org, jakub at gcc dot
| |gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-01 10:34:53 UTC ---
if (added_sets_1)
{
rtx t = i1pat;
if (i0_feeds_i1_n)
t = subst (t, i0dest, i0src, 0, 0);
XVECEXP (newpat, 0, --total_sets) = t;
}
if (added_sets_2)
{
rtx t = i2pat;
if (i0_feeds_i2_n)
t = subst (t, i0dest, i0src, 0, 0);
if (i1_feeds_i2_n)
t = subst (t, i1dest, i1src, 0, 0);
if (i0_feeds_i1_n && i1_feeds_i2_n) <==============
t = subst (t, i0dest, i0src, 0, 0); <==============
XVECEXP (newpat, 0, --total_sets) = t;
}
The two lines above are problematic, because subst may clobber the first
argument's expression and
newpat = subst (newpat, i0dest, i0src, 0,
i0_feeds_i1_n && i0dest_in_i0src);
actually clobbered not just newpat, but also i1src which was in it. Not sure
if we actually can rely it always happened say if substed_i0 is true and not do
the i0dest -> i0src replacement in i2pat here.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/46248] [4.6 regression] crash+infinite recursion in combine
2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
` (2 preceding siblings ...)
2010-11-01 10:35 ` jakub at gcc dot gnu.org
@ 2010-11-01 11:24 ` jakub at gcc dot gnu.org
2010-11-03 8:30 ` jakub at gcc dot gnu.org
2010-11-03 8:39 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2010-11-01 11:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot |jakub at gcc dot gnu.org
|gnu.org |
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-01 11:23:33 UTC ---
Created attachment 22216
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22216
gcc46-pr46034.patch
Untested patch.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/46248] [4.6 regression] crash+infinite recursion in combine
2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
` (3 preceding siblings ...)
2010-11-01 11:24 ` jakub at gcc dot gnu.org
@ 2010-11-03 8:30 ` jakub at gcc dot gnu.org
2010-11-03 8:39 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2010-11-03 8:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-03 08:30:29 UTC ---
Author: jakub
Date: Wed Nov 3 08:30:21 2010
New Revision: 166231
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166231
Log:
PR rtl-optimization/46034
PR rtl-optimization/46212
PR rtl-optimization/46248
* combine.c (try_combine): If added_sets_2 where i0dest_in_i0src
and i0 feeds i1 and i1 feeds i2 or i0 feeds i2, make a copy of i1src
before i0dest -> i0src substitution and pass 1 instead of 0 as last
argument to subst on i2pat.
* gcc.c-torture/compile/pr46034.c: New test.
* gcc.c-torture/compile/pr46248.c: New test.
* gcc.dg/pr46212.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/compile/pr46034.c
trunk/gcc/testsuite/gcc.c-torture/compile/pr46248.c
trunk/gcc/testsuite/gcc.dg/pr46212.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/combine.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug rtl-optimization/46248] [4.6 regression] crash+infinite recursion in combine
2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
` (4 preceding siblings ...)
2010-11-03 8:30 ` jakub at gcc dot gnu.org
@ 2010-11-03 8:39 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2010-11-03 8:39 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46248
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-03 08:38:55 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2010-11-03 8:39 UTC | newest]
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2010-10-31 10:26 [Bug rtl-optimization/46248] New: 4.6 regression: crash+infinite recursion in combine astrange at ithinksw dot com
2010-10-31 15:16 ` [Bug rtl-optimization/46248] " hjl.tools at gmail dot com
2010-10-31 15:27 ` [Bug rtl-optimization/46248] [4.6 regression] " pinskia at gcc dot gnu.org
2010-11-01 10:35 ` jakub at gcc dot gnu.org
2010-11-01 11:24 ` jakub at gcc dot gnu.org
2010-11-03 8:30 ` jakub at gcc dot gnu.org
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