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* [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL
@ 2007-06-15 12:23 jakub at gcc dot gnu dot org
2007-06-15 14:48 ` [Bug tree-optimization/32353] " jakub at gcc dot gnu dot org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: jakub at gcc dot gnu dot org @ 2007-06-15 12:23 UTC (permalink / raw)
To: gcc-bugs
extern "C" void abort ();
struct A
{
int f;
A (int x) : f (x) {}
};
A
foo (const A &x, const A &y)
{
A r (0);
r = x.f == -111 ? y : (y.f == -111 || x.f > y.f) ? x : y;
A s (0);
r = r.f == -111 ? s : (r.f > s.f) ? r : s;
return r;
}
int
main ()
{
A a (A(0));
int b[] = { 1, 2, 9 };
for (int i = 0; i < 3; i++)
{
A c (b[i]);
if (foo (a, c).f != b[i])
abort ();
a = c;
}
}
is miscompiled on i?86-linux with -O2 -m32. From quick glance at the dumps,
dce3 removes a needed statement:
<retval>.fD.2005 = SR.23D.2103_26;
but already *.alias1 seems to be wrong:
# BLOCK 11
# PRED: 10 (true)
<L8>:;
iftmp.3D.2049_27 = &<retval>;
goto <bb 13> (<L10>);
# SUCC: 13 (fallthru)
# BLOCK 12
# PRED: 10 (false)
<L9>:;
iftmp.3D.2049_28 = &sD.2036;
# SUCC: 13 (fallthru)
# BLOCK 13
# PRED: 11 (fallthru) 12 (fallthru)
# iftmp.3D.2049_2 = PHI <iftmp.3D.2049_27(11), iftmp.3D.2049_28(12)>;
<L10>:;
iftmp.2D.2047_29 = iftmp.3D.2049_2;
goto <bb 15> (<L12>);
# SUCC: 15 (fallthru)
# BLOCK 14
# PRED: 9 (false)
<L11>:;
iftmp.2D.2047_30 = &sD.2036;
# SUCC: 15 (fallthru)
# BLOCK 15
# PRED: 13 (fallthru) 14 (fallthru)
# iftmp.2D.2047_1 = PHI <iftmp.2D.2047_29(13), iftmp.2D.2047_30(14)>;
<L12>:;
# D.2051_32 = V_MUST_DEF <D.2051_31>;
# VUSE <SFT.6D.2086_23>;
D.2051 = *iftmp.2D.2047_1;
Note that iftmp.2D.2047_1 can be either &sD.2036 (in that case it really VUSEs
SFT.6D.2086_23), but it can also be &<retval> and that's not stored anywhere.
--
Summary: [4.1/4.2 Regression] Miscompilation with RESULT_DECL
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
GCC target triplet: i386-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
@ 2007-06-15 14:48 ` jakub at gcc dot gnu dot org
2007-06-18 11:27 ` rguenth at gcc dot gnu dot org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu dot org @ 2007-06-15 14:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from jakub at gcc dot gnu dot org 2007-06-15 14:47 -------
--- gcc/tree-ssa-structalias.c.jj 2007-06-11 11:12:27.000000000 +0200
+++ gcc/tree-ssa-structalias.c 2007-06-15 16:40:29.000000000 +0200
@@ -4343,7 +4343,8 @@ set_uids_in_ptset (tree ptr, bitmap into
bitmap_set_bit (into, DECL_UID (sv->var));
}
else if (TREE_CODE (vi->decl) == VAR_DECL
- || TREE_CODE (vi->decl) == PARM_DECL)
+ || TREE_CODE (vi->decl) == PARM_DECL
+ || TREE_CODE (vi->decl) == RESULT_DECL)
{
if (var_can_have_subvars (vi->decl)
&& get_subvars_for_var (vi->decl))
seems to cure this, will try to bootstrap/regtest it now.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dberlin at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
2007-06-15 14:48 ` [Bug tree-optimization/32353] " jakub at gcc dot gnu dot org
@ 2007-06-18 11:27 ` rguenth at gcc dot gnu dot org
2007-06-19 9:09 ` jakub at gcc dot gnu dot org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-06-18 11:27 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-06-18 11:26:54
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
2007-06-15 14:48 ` [Bug tree-optimization/32353] " jakub at gcc dot gnu dot org
2007-06-18 11:27 ` rguenth at gcc dot gnu dot org
@ 2007-06-19 9:09 ` jakub at gcc dot gnu dot org
2007-06-19 9:11 ` jakub at gcc dot gnu dot org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu dot org @ 2007-06-19 9:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from jakub at gcc dot gnu dot org 2007-06-19 09:08 -------
Subject: Bug 32353
Author: jakub
Date: Tue Jun 19 09:08:39 2007
New Revision: 125841
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125841
Log:
PR tree-optimization/32353
* tree-ssa-structalias.c (set_uids_in_ptset): Also handle RESULT_DECL.
* g++.dg/opt/nrv13.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/opt/nrv13.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-structalias.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
` (2 preceding siblings ...)
2007-06-19 9:09 ` jakub at gcc dot gnu dot org
@ 2007-06-19 9:11 ` jakub at gcc dot gnu dot org
2007-06-19 9:18 ` jakub at gcc dot gnu dot org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu dot org @ 2007-06-19 9:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from jakub at gcc dot gnu dot org 2007-06-19 09:11 -------
Subject: Bug 32353
Author: jakub
Date: Tue Jun 19 09:11:22 2007
New Revision: 125842
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125842
Log:
PR tree-optimization/32353
* tree-ssa-structalias.c (set_uids_in_ptset): Also handle RESULT_DECL.
* g++.dg/opt/nrv13.C: New test.
Added:
branches/gcc-4_2-branch/gcc/testsuite/g++.dg/opt/nrv13.C
Modified:
branches/gcc-4_2-branch/gcc/ChangeLog
branches/gcc-4_2-branch/gcc/testsuite/ChangeLog
branches/gcc-4_2-branch/gcc/tree-ssa-structalias.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
` (3 preceding siblings ...)
2007-06-19 9:11 ` jakub at gcc dot gnu dot org
@ 2007-06-19 9:18 ` jakub at gcc dot gnu dot org
2007-06-19 9:19 ` jakub at gcc dot gnu dot org
2008-04-03 1:03 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu dot org @ 2007-06-19 9:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from jakub at gcc dot gnu dot org 2007-06-19 09:18 -------
Subject: Bug 32353
Author: jakub
Date: Tue Jun 19 09:18:13 2007
New Revision: 125843
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125843
Log:
PR tree-optimization/32353
* tree-ssa-structalias.c (set_uids_in_ptset): Also handle RESULT_DECL.
* g++.dg/opt/nrv13.C: New test.
Added:
branches/gcc-4_1-branch/gcc/testsuite/g++.dg/opt/nrv13.C
Modified:
branches/gcc-4_1-branch/gcc/ChangeLog
branches/gcc-4_1-branch/gcc/testsuite/ChangeLog
branches/gcc-4_1-branch/gcc/tree-ssa-structalias.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
` (4 preceding siblings ...)
2007-06-19 9:18 ` jakub at gcc dot gnu dot org
@ 2007-06-19 9:19 ` jakub at gcc dot gnu dot org
2008-04-03 1:03 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 8+ messages in thread
From: jakub at gcc dot gnu dot org @ 2007-06-19 9:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from jakub at gcc dot gnu dot org 2007-06-19 09:19 -------
Fixed.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug tree-optimization/32353] [4.1/4.2 Regression] Miscompilation with RESULT_DECL
2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
` (5 preceding siblings ...)
2007-06-19 9:19 ` jakub at gcc dot gnu dot org
@ 2008-04-03 1:03 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 8+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2008-04-03 1:03 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.1.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32353
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2008-04-03 1:03 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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2007-06-15 12:23 [Bug tree-optimization/32353] New: [4.1/4.2 Regression] Miscompilation with RESULT_DECL jakub at gcc dot gnu dot org
2007-06-15 14:48 ` [Bug tree-optimization/32353] " jakub at gcc dot gnu dot org
2007-06-18 11:27 ` rguenth at gcc dot gnu dot org
2007-06-19 9:09 ` jakub at gcc dot gnu dot org
2007-06-19 9:11 ` jakub at gcc dot gnu dot org
2007-06-19 9:18 ` jakub at gcc dot gnu dot org
2007-06-19 9:19 ` jakub at gcc dot gnu dot org
2008-04-03 1:03 ` pinskia at gcc dot gnu dot org
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