* [Bug c/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
@ 2006-02-06 9:18 ` cajus dot hahn at de dot abb dot com
2006-02-06 19:46 ` [Bug target/26118] " lmorrison at nautel dot com
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: cajus dot hahn at de dot abb dot com @ 2006-02-06 9:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from cajus dot hahn at de dot abb dot com 2006-02-06 09:18 -------
Created an attachment (id=10783)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10783&action=view)
Complete project.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
2006-02-06 9:18 ` [Bug c/26118] " cajus dot hahn at de dot abb dot com
@ 2006-02-06 19:46 ` lmorrison at nautel dot com
2006-02-06 19:49 ` lmorrison at nautel dot com
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: lmorrison at nautel dot com @ 2006-02-06 19:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from lmorrison at nautel dot com 2006-02-06 19:46 -------
Created an attachment (id=10791)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10791&action=view)
preprocessed source demonstrating bug
produced with commandline:
avr-gcc -E -mmcu=atmega32 -I. -gdwarf-2 -DF_CPU=8000000UL -Os -funsigned-char
-funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes
-Wa,-adhlns=main.lst -std=gnu99 main.c -o main.i
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
2006-02-06 9:18 ` [Bug c/26118] " cajus dot hahn at de dot abb dot com
2006-02-06 19:46 ` [Bug target/26118] " lmorrison at nautel dot com
@ 2006-02-06 19:49 ` lmorrison at nautel dot com
2006-02-06 19:54 ` lmorrison at nautel dot com
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: lmorrison at nautel dot com @ 2006-02-06 19:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from lmorrison at nautel dot com 2006-02-06 19:49 -------
Created an attachment (id=10792)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10792&action=view)
assembly output from previous preprocessed source
Generated with commandline:
avr-gcc -c -mmcu=atmega32 -I. -gdwarf-2 -DF_CPU=8000000UL -Os -funsigned-char
-funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes
-Wa,-adhlns=main.lst -std=gnu99 -MD -MP -MF .dep/main.o.d main.c -o main.o
Using gcc 3.4.5 on Win32 host, avr target.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
` (2 preceding siblings ...)
2006-02-06 19:49 ` lmorrison at nautel dot com
@ 2006-02-06 19:54 ` lmorrison at nautel dot com
2006-02-06 20:05 ` cajus dot hahn at de dot abb dot com
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: lmorrison at nautel dot com @ 2006-02-06 19:54 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from lmorrison at nautel dot com 2006-02-06 19:54 -------
(From update of attachment 10792)
assembly output from previous preprocessed source
Generated with commandline:
avr-gcc -c -mmcu=atmega32 -I. -gdwarf-2 -DF_CPU=8000000UL -Os -funsigned-char
-funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes
-Wa,-adhlns=main.lst -std=gnu99 -MD -MP -MF .dep/main.o.d main.c -o main.o
Using gcc 3.4.5 on Win32 host, avr target.
In the first two examples ( *ptr++ = struct; and memcpy(ptr++, &struct,
sizeof(struct)); ) the source pointer is being incremented by sizeof(struct)
for each byte being copied.
In the third example, the pointer increment is set aside as a distinct
statement. Here, things behave as expected.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
` (3 preceding siblings ...)
2006-02-06 19:54 ` lmorrison at nautel dot com
@ 2006-02-06 20:05 ` cajus dot hahn at de dot abb dot com
2006-03-01 18:53 ` j at uriah dot heep dot sax dot de
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: cajus dot hahn at de dot abb dot com @ 2006-02-06 20:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from cajus dot hahn at de dot abb dot com 2006-02-06 20:05 -------
You are right,
*ptr = struct;
ptr++;
works.I must have mixed up some of my testing results.
Cajus
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
` (4 preceding siblings ...)
2006-02-06 20:05 ` cajus dot hahn at de dot abb dot com
@ 2006-03-01 18:53 ` j at uriah dot heep dot sax dot de
2008-12-26 16:12 ` tkoenig at gcc dot gnu dot org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: j at uriah dot heep dot sax dot de @ 2006-03-01 18:53 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from j at uriah dot heep dot sax dot de 2006-03-01 18:53 -------
After tracking it down, it turns out to be the following change,
introduced between GCC 3.4.3 and 3.4.4:
2005-03-19 Andy Hutchinson <HutchinsonAndy@netscape.net>
PR target/18251
* config/avr/avr.md (movstrhi): Rewrite as RTL loop.
(*movstrqi_insn): Delete.
(*movstrhi): Delete.
Here's the corresponding SVN log entry:
Revision 96732 - (view) (download) - [select for diffs]
Modified Sat Mar 19 15:45:41 2005 UTC (11 months, 1 week ago) by marekm
File length: 79688 byte(s)
Diff to previous 96394 (colored)
PR target/18251
* config/avr/avr.md (movstrhi): Rewrite as RTL loop.
(*movstrqi_insn): Delete.
(*movstrhi): Delete.
When unpatching the diff for that revision, the generated code for the
testcase looks OK again.
--
j at uriah dot heep dot sax dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |j at uriah dot heep dot sax
| |dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
` (5 preceding siblings ...)
2006-03-01 18:53 ` j at uriah dot heep dot sax dot de
@ 2008-12-26 16:12 ` tkoenig at gcc dot gnu dot org
2009-08-20 9:47 ` anitha dot boyapati at atmel dot com
2009-08-20 22:13 ` eric dot weddington at atmel dot com
8 siblings, 0 replies; 10+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2008-12-26 16:12 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from tkoenig at gcc dot gnu dot org 2008-12-26 16:08 -------
Is this still an issue with current trunk?
gcc 3.4 has been out of maintenance for some time.
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
` (6 preceding siblings ...)
2008-12-26 16:12 ` tkoenig at gcc dot gnu dot org
@ 2009-08-20 9:47 ` anitha dot boyapati at atmel dot com
2009-08-20 22:13 ` eric dot weddington at atmel dot com
8 siblings, 0 replies; 10+ messages in thread
From: anitha dot boyapati at atmel dot com @ 2009-08-20 9:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from anitha dot boyapati at atmel dot com 2009-08-20 09:46 -------
Created an attachment (id=18403)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18403&action=view)
Images display the contents of rx_tel_in_ptr before and after the assignment
This issue does not arise with avr-studio 4.17 (win-avr 4.3.2). The memory
contents of rx_tel_in_ptr before assignment and after increment are observed.
The contents of RXtemp got copied to the address pointed by rx_tel_in_ptr as
well as the pointer is post-incremented. Screenshots attached.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug target/26118] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer
2006-02-06 9:17 [Bug c/26118] New: avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer cajus dot hahn at de dot abb dot com
` (7 preceding siblings ...)
2009-08-20 9:47 ` anitha dot boyapati at atmel dot com
@ 2009-08-20 22:13 ` eric dot weddington at atmel dot com
8 siblings, 0 replies; 10+ messages in thread
From: eric dot weddington at atmel dot com @ 2009-08-20 22:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from eric dot weddington at atmel dot com 2009-08-20 22:13 -------
According to comment #8, the problem no longer exists in gcc 4.3.2. Closing bug
as WONTFIX.
--
eric dot weddington at atmel dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Known to work| |4.3.2
Resolution| |WONTFIX
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118
^ permalink raw reply [flat|nested] 10+ messages in thread