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* [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void*
@ 2007-09-10 23:47 debian-gcc at lists dot debian dot org
2007-09-11 3:32 ` [Bug target/33381] " mmitchel at gcc dot gnu dot org
` (10 more replies)
0 siblings, 11 replies; 12+ messages in thread
From: debian-gcc at lists dot debian dot org @ 2007-09-10 23:47 UTC (permalink / raw)
To: gcc-bugs
[forwarded from http://bugs.debian.org/440545]
seen with 4.2 branch 20070902, works with 4,1 branch and trunk
Matthias
Output from attached program, if compiled with optimization level -O2:
>From 0 to 2:
0 - In: -1, -1 (0xffffffffffffffff), Out: -1
1 - In: 0, 0 (0xffffffffffffffff), Out: 0
2 - In: 1, 1 (0xffffffffffffffff), Out: 1
>From 1 to 3:
1 - In: 0, 0 ((nil)), Out: 0
2 - In: 1, 1 (0x1), Out: 1
3 - In: 2, 2 (0x2), Out: 2
Should be
>From 0 to 2:
0 - In: -1, -1 (0xffffffffffffffff), Out: -1
1 - In: 0, 0 ((nil)), Out: 0
2 - In: 1, 1 (0x1), Out: 1
>From 1 to 3:
1 - In: 0, 0 ((nil)), Out: 0
2 - In: 1, 1 (0x1), Out: 1
3 - In: 2, 2 (0x2), Out: 2
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
int i = 0;
printf("From 0 to 2:\n");
for (i = 0; i < 3; i++) {
int iin = i - 1;
signed long lin = iin;
void *pin = (void *) lin;
signed long iout = (signed long) pin;
printf(" %d - In: %d, %ld (%p), Out: %ld\n", i, iin, lin, pin, iout);
}
printf("From 1 to 3:\n");
for (i = 1; i < 4; i++) {
int iin = i - 1;
signed long lin = iin;
void *pin = (void *) lin;
signed long iout = (signed long) pin;
printf(" %d - In: %d, %ld (%p), Out: %ld\n", i, iin, lin, pin, iout);
}
return EXIT_SUCCESS;
}
--
Summary: [4.2 regression] miscompilation casting signed long to
void*
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: debian-gcc at lists dot debian dot org
GCC target triplet: x64_86-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
@ 2007-09-11 3:32 ` mmitchel at gcc dot gnu dot org
2007-09-11 10:21 ` pinskia at gcc dot gnu dot org
` (9 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2007-09-11 3:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from mmitchel at gcc dot gnu dot org 2007-09-11 03:32 -------
Ian --
Is this a VRP issue?
Thanks,
-- Mark
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ian at airs dot com
Priority|P3 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
2007-09-11 3:32 ` [Bug target/33381] " mmitchel at gcc dot gnu dot org
@ 2007-09-11 10:21 ` pinskia at gcc dot gnu dot org
2007-09-11 11:31 ` rguenth at gcc dot gnu dot org
` (8 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-09-11 10:21 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.2.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
2007-09-11 3:32 ` [Bug target/33381] " mmitchel at gcc dot gnu dot org
2007-09-11 10:21 ` pinskia at gcc dot gnu dot org
@ 2007-09-11 11:31 ` rguenth at gcc dot gnu dot org
2007-09-11 11:34 ` rguenth at gcc dot gnu dot org
` (7 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-09-11 11:31 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from rguenth at gcc dot gnu dot org 2007-09-11 11:31 -------
A bug in VRP respective its friend SCEV.
iin_5 = i_1 - 1;
lin_6 = iin_5;
pin_7 = (void *) iin_5;
iout_8 = iin_5;
printf (&" %d - In: %d, %ld (%p), Out: %ld\n"[0], i_1, iin_5, iin_5, pin_7,
iin_5);
i_9 = i_1 + 1;
(scalar = pin_7)
(scalar_evolution = {-1B, +, 1B}_1))
)
(instantiate_parameters
(loop_nb = 1)
(chrec = {-1B, +, 1B}_1)
(res = {-1B, +, 1B}_1))
Found new range for pin_7: [-1B, -1B]
Value ranges after VRP:
i_1: VARYING
i_2: ~[0, 0] EQUIVALENCES: { } (0 elements)
iin_5: [-1, 1] EQUIVALENCES: { } (0 elements)
lin_6: [-1, 1] EQUIVALENCES: { iin_5 } (1 elements)
pin_7: [-1B, -1B] EQUIVALENCES: { } (0 elements)
<L0>:;
iin_5 = i_27 - 1;
lin_6 = iin_5;
pin_7 = (void *) iin_5;
iout_8 = iin_5;
printf (&" %d - In: %d, %ld (%p), Out: %ld\n"[0], i_27, iin_5, iin_5, -1B,
iin_5);
i_9 = i_27 + 1;
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-09-11 11:31:46
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (2 preceding siblings ...)
2007-09-11 11:31 ` rguenth at gcc dot gnu dot org
@ 2007-09-11 11:34 ` rguenth at gcc dot gnu dot org
2007-09-21 13:04 ` rguenth at gcc dot gnu dot org
` (6 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-09-11 11:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from rguenth at gcc dot gnu dot org 2007-09-11 11:33 -------
I think this is related (but not exactly dup) of PR33099.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |33099
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (3 preceding siblings ...)
2007-09-11 11:34 ` rguenth at gcc dot gnu dot org
@ 2007-09-21 13:04 ` rguenth at gcc dot gnu dot org
2007-09-21 13:37 ` rguenth at gcc dot gnu dot org
` (5 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-09-21 13:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from rguenth at gcc dot gnu dot org 2007-09-21 13:04 -------
Shorter testcase:
void x(void *data);
void test()
{
long i;
for (i = 0; i < 5; i++)
if (i > 0)
x((void *)(i - 1));
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (4 preceding siblings ...)
2007-09-21 13:04 ` rguenth at gcc dot gnu dot org
@ 2007-09-21 13:37 ` rguenth at gcc dot gnu dot org
2007-09-25 7:16 ` debian-gcc at lists dot debian dot org
` (4 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-09-21 13:37 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from rguenth at gcc dot gnu dot org 2007-09-21 13:36 -------
This was fixed by the introduction of pointer-plus, which removed all traces
of fold_used_pointer* in tree-scalar-evolution.c.
A safe patch would go along the following:
Index: tree-vrp.c
===================================================================
--- tree-vrp.c (revision 128649)
+++ tree-vrp.c (working copy)
@@ -2482,6 +2482,13 @@ adjust_range_with_scev (value_range_t *v
if (vr->type == VR_ANTI_RANGE)
return;
+ /* Don't try to feed SCEV with casts to pointer type. */
+ if (TREE_CODE (stmt) == MODIFY_EXPR
+ && (TREE_CODE (TREE_OPERAND (stmt, 1)) == NOP_EXPR
+ || TREE_CODE (TREE_OPERAND (stmt, 1)) == CONVERT_EXPR)
+ && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (stmt, 1))))
+ return;
+
chrec = instantiate_parameters (loop, analyze_scalar_evolution (loop, var));
if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
return;
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2007-09-11 11:31:46 |2007-09-21 13:36:53
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (5 preceding siblings ...)
2007-09-21 13:37 ` rguenth at gcc dot gnu dot org
@ 2007-09-25 7:16 ` debian-gcc at lists dot debian dot org
2007-09-25 8:25 ` rguenther at suse dot de
` (3 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: debian-gcc at lists dot debian dot org @ 2007-09-25 7:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from debian-gcc at lists dot debian dot org 2007-09-25 07:15 -------
comparing 4.2 20070902 with 4.2 20070925 + plus the proposed patch, I see two
regressions:
FAIL: g++.dg/ext/vla4.C (test for errors, line 10)
FAIL: g++.dg/other/unused1.C scan-assembler
(string|ascii?)z?\\t"class2("|\\\\\\\\000)
Currently checking 20070925 without the proposed patch.
Matthias
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (6 preceding siblings ...)
2007-09-25 7:16 ` debian-gcc at lists dot debian dot org
@ 2007-09-25 8:25 ` rguenther at suse dot de
2007-09-25 13:37 ` debian-gcc at lists dot debian dot org
` (2 subsequent siblings)
10 siblings, 0 replies; 12+ messages in thread
From: rguenther at suse dot de @ 2007-09-25 8:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from rguenther at suse dot de 2007-09-25 08:25 -------
Subject: Re: [4.2 regression] miscompilation casting signed
long to void*
On Tue, 25 Sep 2007, debian-gcc at lists dot debian dot org wrote:
> ------- Comment #6 from debian-gcc at lists dot debian dot org 2007-09-25 07:15 -------
> comparing 4.2 20070902 with 4.2 20070925 + plus the proposed patch, I see two
> regressions:
>
> FAIL: g++.dg/ext/vla4.C (test for errors, line 10)
> FAIL: g++.dg/other/unused1.C scan-assembler
> (string|ascii?)z?\\t"class2("|\\\\\\\\000)
>
> Currently checking 20070925 without the proposed patch.
They also happened w/o the patch for me.
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (7 preceding siblings ...)
2007-09-25 8:25 ` rguenther at suse dot de
@ 2007-09-25 13:37 ` debian-gcc at lists dot debian dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: debian-gcc at lists dot debian dot org @ 2007-09-25 13:37 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from debian-gcc at lists dot debian dot org 2007-09-25 13:36 -------
> > Currently checking 20070925 without the proposed patch.
>
> They also happened w/o the patch for me.
same here, Matthias
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (8 preceding siblings ...)
2007-09-25 13:37 ` debian-gcc at lists dot debian dot org
@ 2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-10-10 9:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from rguenth at gcc dot gnu dot org 2007-10-10 09:24 -------
Fixed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
* [Bug target/33381] [4.2 regression] miscompilation casting signed long to void*
2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
` (9 preceding siblings ...)
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
@ 2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-10-10 9:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from rguenth at gcc dot gnu dot org 2007-10-10 09:24 -------
Subject: Bug 33381
Author: rguenth
Date: Wed Oct 10 09:24:43 2007
New Revision: 129197
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=129197
Log:
2007-10-10 Richard Guenther <rguenther@suse.de>
PR tree-optimization/33099
PR tree-optimization/33381
* tree-vrp.c (adjust_range_with_scev): Do not adjust ranges
from pointer typed chrecs.
* gcc.c-torture/execute/pr33099.c: New testcase.
* gcc.c-torture/execute/pr33381.c: Likewise.
Added:
branches/gcc-4_2-branch/gcc/testsuite/gcc.c-torture/execute/pr33099.c
branches/gcc-4_2-branch/gcc/testsuite/gcc.c-torture/execute/pr33381.c
Modified:
branches/gcc-4_2-branch/gcc/ChangeLog
branches/gcc-4_2-branch/gcc/testsuite/ChangeLog
branches/gcc-4_2-branch/gcc/tree-vrp.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33381
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2007-10-10 9:25 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
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2007-09-10 23:47 [Bug target/33381] New: [4.2 regression] miscompilation casting signed long to void* debian-gcc at lists dot debian dot org
2007-09-11 3:32 ` [Bug target/33381] " mmitchel at gcc dot gnu dot org
2007-09-11 10:21 ` pinskia at gcc dot gnu dot org
2007-09-11 11:31 ` rguenth at gcc dot gnu dot org
2007-09-11 11:34 ` rguenth at gcc dot gnu dot org
2007-09-21 13:04 ` rguenth at gcc dot gnu dot org
2007-09-21 13:37 ` rguenth at gcc dot gnu dot org
2007-09-25 7:16 ` debian-gcc at lists dot debian dot org
2007-09-25 8:25 ` rguenther at suse dot de
2007-09-25 13:37 ` debian-gcc at lists dot debian dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
2007-10-10 9:25 ` rguenth at gcc dot gnu dot org
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