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* [Bug tree-optimization/66185] New: ICE on valid code at -O3 on x86_64-linux-gnu
@ 2015-05-17 19:13 su at cs dot ucdavis.edu
2015-05-18 12:43 ` [Bug tree-optimization/66185] [6 Regression] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: su at cs dot ucdavis.edu @ 2015-05-17 19:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66185
Bug ID: 66185
Summary: ICE on valid code at -O3 on x86_64-linux-gnu
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The following code causes an ICE when compiled with the current gcc trunk at
-O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 5.1.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/6.0.0/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 6.0.0 20150517 (experimental) [trunk revision 223265] (GCC)
$
$ gcc-trunk -O2 small.c; ./a.out
$ gcc-5.1 -O3 small.c; ./a.out
$
$ gcc-trunk -O3 small.c
small.c: In function ‘main’:
small.c:5:1: internal compiler error: Segmentation fault
main ()
^
0xacd85f crash_signal
../../gcc-trunk/gcc/toplev.c:380
0xd066c8 vec<gimple_statement_base*, va_heap, vl_embed>::operator[](unsigned
int)
../../gcc-trunk/gcc/vec.h:736
0xd066c8 vec<gimple_statement_base*, va_heap, vl_ptr>::operator[](unsigned int)
../../gcc-trunk/gcc/vec.h:1202
0xd066c8 vect_analyze_slp_instance
../../gcc-trunk/gcc/tree-vect-slp.c:1805
0xd07606 vect_analyze_slp(_loop_vec_info*, _bb_vec_info*, unsigned int)
../../gcc-trunk/gcc/tree-vect-slp.c:1897
0xd07ad6 vect_slp_analyze_bb_1
../../gcc-trunk/gcc/tree-vect-slp.c:2431
0xd07ad6 vect_slp_analyze_bb(basic_block_def*)
../../gcc-trunk/gcc/tree-vect-slp.c:2561
0xd09e42 execute
../../gcc-trunk/gcc/tree-vectorizer.c:662
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$
------------------------------------
unsigned int a;
int b[5], c;
int
main ()
{
for (c = 0; c < 4; c++)
b[c] = b[c+1] > ((b[0] > 0) > a);
return 0;
}
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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/66186] New: wrong code at -O3 on x86_64-linux-gnu
Date: Sun, 17 May 2015 19:20:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 6.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: su at cs dot ucdavis.edu
X-Bugzilla-Status: UNCONFIRMED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf186
Bug ID: 66186
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The current gcc trunk (as well as 4.9.x and 5.1.x) miscompiles the following
code on x86_64-linux at -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/6.0.0/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 6.0.0 20150517 (experimental) [trunk revision 223265] (GCC)
$
$ gcc-trunk -O2 small.c; ./a.out
$ gcc-4.8.4 -O3 small.c; ./a.out
$
$ gcc-trunk -O3 small.c
$ ./a.out
Segmentation fault (core dumped)
$ gcc-5.1 -O3 small.c
$ ./a.out
Segmentation fault (core dumped)
$ gcc-4.9.2 -O3 small.c
$ ./a.out
Segmentation fault (core dumped)
$
--------------------------------------
int a;
int
main ()
{
int b = -1, d, e = 0, f[2] = { 0 };
unsigned short c = b;
for (; e < 3; e++)
for (d = 0; d < 2; d++)
if (a < 0)
for (d = 0; d < 2; d++)
if (f[c])
break;
return 0;
}
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/66185] [6 Regression] ICE on valid code at -O3 on x86_64-linux-gnu
2015-05-17 19:13 [Bug tree-optimization/66185] New: ICE on valid code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
@ 2015-05-18 12:43 ` rguenth at gcc dot gnu.org
2015-05-19 9:37 ` rguenth at gcc dot gnu.org
2015-05-19 9:37 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-05-18 12:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66185
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine (probably a dup).
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/66185] [6 Regression] ICE on valid code at -O3 on x86_64-linux-gnu
2015-05-17 19:13 [Bug tree-optimization/66185] New: ICE on valid code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-05-18 12:43 ` [Bug tree-optimization/66185] [6 Regression] " rguenth at gcc dot gnu.org
2015-05-19 9:37 ` rguenth at gcc dot gnu.org
@ 2015-05-19 9:37 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-05-19 9:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66185
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/66185] [6 Regression] ICE on valid code at -O3 on x86_64-linux-gnu
2015-05-17 19:13 [Bug tree-optimization/66185] New: ICE on valid code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-05-18 12:43 ` [Bug tree-optimization/66185] [6 Regression] " rguenth at gcc dot gnu.org
@ 2015-05-19 9:37 ` rguenth at gcc dot gnu.org
2015-05-19 9:37 ` rguenth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-05-19 9:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66185
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue May 19 09:36:35 2015
New Revision: 223349
URL: https://gcc.gnu.org/viewcvs?rev=223349&root=gcc&view=rev
Log:
2015-05-19 Richard Biener <rguenther@suse.de>
PR tree-optimization/66165
* tree-vect-slp.c (vect_supported_load_permutation_p): Add guard
for no load permutation.
* gcc.dg/torture/pr66165.c: New testcase.
PR tree-optimization/66185
* tree-vect-slp.c (vect_build_slp_tree): Properly roll back
when building the SLP node from scalars.
* gcc.dg/torture/pr66185.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr66165.c
trunk/gcc/testsuite/gcc.dg/torture/pr66185.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-slp.c
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-05-17 19:13 [Bug tree-optimization/66185] New: ICE on valid code at -O3 on x86_64-linux-gnu su at cs dot ucdavis.edu
2015-05-18 12:43 ` [Bug tree-optimization/66185] [6 Regression] " rguenth at gcc dot gnu.org
2015-05-19 9:37 ` rguenth at gcc dot gnu.org
2015-05-19 9:37 ` rguenth at gcc dot gnu.org
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