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* [Bug tree-optimization/53045] New: Missing loop termination
@ 2012-04-19 17:00 ubizjak at gmail dot com
2012-04-20 9:23 ` [Bug tree-optimization/53045] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: ubizjak at gmail dot com @ 2012-04-19 17:00 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53045
Bug #: 53045
Summary: Missing loop termination
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: ubizjak@gmail.com
Following testcase
--cut here--
struct { double d[1]; } foo0, foo1, foo2, foo3, foo4, foo5, foo6, foo7;
int main ()
{
struct { double d; } bar[8]
= { 48.394, 39.3, -397.9, 3484.9, -8.394, -93.3, 7.9, 84.94 };
int i;
for (i = 0; i < 8; i++)
foo0.d[i] = bar[i].d;
return 0;
}
-- cut here--
segfaults when compiled with -O2,
xgcc (GCC) 4.8.0 20120419 (experimental) [trunk revision 186596]
Loop termination is missing from asm dump:
.L2:
movsd %xmm0, foo0(%rax)
movsd -64(%rsp,%rax), %xmm0
addq $8, %rax
jmp .L2
Loop termination is already missing from .optimized dump:
This problem is the reason for following testsuite failures on x86 AVX:
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution, -O2
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution, -O3
-fomit-frame-pointer
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution, -O3
-fomit-frame-pointer -funroll-loops
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution, -O3
-fomit-frame-pointer -funroll-all-loops -finli
ne-functions
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution, -O3 -g
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution, -Os
FAIL: gcc.target/x86_64/abi/avx/test_passing_unions.c execution, -O2
FAIL: gcc.target/x86_64/abi/avx/test_passing_unions.c execution, -O3
-fomit-frame-pointer
FAIL: gcc.target/x86_64/abi/avx/test_passing_unions.c execution, -O3
-fomit-frame-pointer -funroll-loops
FAIL: gcc.target/x86_64/abi/avx/test_passing_unions.c execution, -O3
-fomit-frame-pointer -funroll-all-loops -finlin
e-functions
FAIL: gcc.target/x86_64/abi/avx/test_passing_unions.c execution, -O3 -g
FAIL: gcc.target/x86_64/abi/avx/test_passing_unions.c execution, -Os
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/53045] Missing loop termination
2012-04-19 17:00 [Bug tree-optimization/53045] New: Missing loop termination ubizjak at gmail dot com
@ 2012-04-20 9:23 ` rguenth at gcc dot gnu.org
2012-04-20 9:24 ` rguenth at gcc dot gnu.org
2012-04-20 16:14 ` ubizjak at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-04-20 9:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53045
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-20 09:23:09 UTC ---
struct { double d[1]; } foo0, foo1, foo2, foo3, foo4, foo5, foo6, foo7;
int main ()
{
struct { double d; } bar[8]
= { 48.394, 39.3, -397.9, 3484.9, -8.394, -93.3, 7.9, 84.94 };
int i;
for (i = 0; i < 8; i++)
foo0.d[i] = bar[i].d;
return 0;
}
This is invalid source - foo0.d[1] is an out-of-bound access. Number of
iteration analysis correctly concludes that i is in the range of [0, 0]
and optimizes away the loop exit test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/53045] Missing loop termination
2012-04-19 17:00 [Bug tree-optimization/53045] New: Missing loop termination ubizjak at gmail dot com
2012-04-20 9:23 ` [Bug tree-optimization/53045] " rguenth at gcc dot gnu.org
@ 2012-04-20 9:24 ` rguenth at gcc dot gnu.org
2012-04-20 16:14 ` ubizjak at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-04-20 9:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53045
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-20 09:24:06 UTC ---
Btw, see how I fixed
2012-04-18 Richard Guenther <rguenther@suse.de>
* gcc.target/x86_64/abi/test_passing_unions.c: Avoid undefined
array access.
* gcc.target/x86_64/abi/test_passing_structs.c: Likewise.
* gcc.target/i386/avx256-unaligned-load-4.c: Fix array sizes.
I suppose I didn't see the AVX fails because my testing box doesn't have AVX.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/53045] Missing loop termination
2012-04-19 17:00 [Bug tree-optimization/53045] New: Missing loop termination ubizjak at gmail dot com
2012-04-20 9:23 ` [Bug tree-optimization/53045] " rguenth at gcc dot gnu.org
2012-04-20 9:24 ` rguenth at gcc dot gnu.org
@ 2012-04-20 16:14 ` ubizjak at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: ubizjak at gmail dot com @ 2012-04-20 16:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53045
--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2012-04-20 16:13:49 UTC ---
(In reply to comment #2)
> Btw, see how I fixed
>
> 2012-04-18 Richard Guenther <rguenther@suse.de>
>
> * gcc.target/x86_64/abi/test_passing_unions.c: Avoid undefined
> array access.
> * gcc.target/x86_64/abi/test_passing_structs.c: Likewise.
> * gcc.target/i386/avx256-unaligned-load-4.c: Fix array sizes.
>
> I suppose I didn't see the AVX fails because my testing box doesn't have AVX.
Thanks, I have fixed AVX testcases in the same way.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-04-20 16:14 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2012-04-19 17:00 [Bug tree-optimization/53045] New: Missing loop termination ubizjak at gmail dot com
2012-04-20 9:23 ` [Bug tree-optimization/53045] " rguenth at gcc dot gnu.org
2012-04-20 9:24 ` rguenth at gcc dot gnu.org
2012-04-20 16:14 ` ubizjak at gmail dot com
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