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* [Bug middle-end/43323] New: Wrong code with bitfields and type casting.
@ 2010-03-10 15:37 marbacz at gmail dot com
2010-03-10 15:55 ` [Bug middle-end/43323] [4.4 Regression] " rguenth at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 9+ messages in thread
From: marbacz at gmail dot com @ 2010-03-10 15:37 UTC (permalink / raw)
To: gcc-bugs
When compiled with gcc 4.4.[34] The following code prints fe 01, while it
should fe ff. Current svn trunk produces correct results.
No flags needed to reproduce.
extern int printf(const char * __restrict, ...);
int main()
{
struct { unsigned bar:1; } foo;
foo.bar = 0x1;
printf("%02x\n", (unsigned char)(foo.bar * 0xfe));
printf("%02x\n", (unsigned char)(foo.bar * 0xff));
return 0;
}
gcc -v:
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-svn/configure --enable-stage1-languages-c
--enable-languages=c,c++
Thread model: posix
gcc version 4.4.4 20100309 (prerelease) (GCC)
--
Summary: Wrong code with bitfields and type casting.
Product: gcc
Version: 4.4.4
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: marbacz at gmail dot com
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
2010-03-10 15:37 [Bug middle-end/43323] New: Wrong code with bitfields and type casting marbacz at gmail dot com
@ 2010-03-10 15:55 ` rguenth at gcc dot gnu dot org
2010-03-10 20:05 ` hjl dot tools at gmail dot com
` (3 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-03-10 15:55 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2010-03-10 15:55 -------
Confirmed.
extern void abort (void);
int main()
{
struct { unsigned bar:1; } foo;
foo.bar = 0x1;
if ((unsigned char)(foo.bar * 0xfe) != 0xfeu)
abort ();
if ((unsigned char)(foo.bar * 0xff) != 0xffu)
abort ();
return 0;
}
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |wrong-code
Known to fail| |4.4.0 4.4.3
Known to work| |4.3.4 4.5.0
Last reconfirmed|0000-00-00 00:00:00 |2010-03-10 15:55:16
date| |
Summary|Wrong code with bitfields |[4.4 Regression] Wrong code
|and type casting. |with bitfields and type
| |casting.
Target Milestone|--- |4.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
2010-03-10 15:37 [Bug middle-end/43323] New: Wrong code with bitfields and type casting marbacz at gmail dot com
2010-03-10 15:55 ` [Bug middle-end/43323] [4.4 Regression] " rguenth at gcc dot gnu dot org
@ 2010-03-10 20:05 ` hjl dot tools at gmail dot com
2010-03-11 15:20 ` mikpe at it dot uu dot se
` (2 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: hjl dot tools at gmail dot com @ 2010-03-10 20:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from hjl dot tools at gmail dot com 2010-03-10 20:05 -------
It is fixed on trunk on revision 148631:
http://gcc.gnu.org/ml/gcc-cvs/2009-06/msg00613.html
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nemet at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
2010-03-10 15:37 [Bug middle-end/43323] New: Wrong code with bitfields and type casting marbacz at gmail dot com
2010-03-10 15:55 ` [Bug middle-end/43323] [4.4 Regression] " rguenth at gcc dot gnu dot org
2010-03-10 20:05 ` hjl dot tools at gmail dot com
@ 2010-03-11 15:20 ` mikpe at it dot uu dot se
2010-03-13 11:03 ` mikpe at it dot uu dot se
2010-04-30 8:58 ` jakub at gcc dot gnu dot org
4 siblings, 0 replies; 9+ messages in thread
From: mikpe at it dot uu dot se @ 2010-03-11 15:20 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from mikpe at it dot uu dot se 2010-03-11 15:19 -------
Created an attachment (id=20082)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20082&action=view)
backport of Adam Nemet's STRIP_NOPS patch to gcc-4.4.3
I've backported Adam Nemet's STRIP_NOPS patch in r148631 to gcc-4.4.3 and added
the second PR43323 test case. Bootstrapped and regtested on i686-linux w/o
regressions. Both Adam's original test case and the PR43323 one pass with this
patch but fail without it.
I'll do more testing on other archs (arm, sparc64, powerpc64, amd64) next.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
2010-03-10 15:37 [Bug middle-end/43323] New: Wrong code with bitfields and type casting marbacz at gmail dot com
` (2 preceding siblings ...)
2010-03-11 15:20 ` mikpe at it dot uu dot se
@ 2010-03-13 11:03 ` mikpe at it dot uu dot se
2010-04-30 8:58 ` jakub at gcc dot gnu dot org
4 siblings, 0 replies; 9+ messages in thread
From: mikpe at it dot uu dot se @ 2010-03-13 11:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from mikpe at it dot uu dot se 2010-03-13 11:03 -------
Patch posted to gcc-patches:
http://gcc.gnu.org/ml/gcc-patches/2010-03/msg00510.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
2010-03-10 15:37 [Bug middle-end/43323] New: Wrong code with bitfields and type casting marbacz at gmail dot com
` (3 preceding siblings ...)
2010-03-13 11:03 ` mikpe at it dot uu dot se
@ 2010-04-30 8:58 ` jakub at gcc dot gnu dot org
4 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-04-30 8:58 UTC (permalink / raw)
To: gcc-bugs
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.4.4 |4.4.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
[not found] <bug-43323-4@http.gcc.gnu.org/bugzilla/>
2010-10-01 11:59 ` jakub at gcc dot gnu.org
2011-04-16 10:38 ` jakub at gcc dot gnu.org
@ 2012-03-13 16:11 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-03-13 16:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|4.4.7 |4.5.0
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-13 13:04:07 UTC ---
Fixed in 4.5+, 4.4 is no longer supported.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
[not found] <bug-43323-4@http.gcc.gnu.org/bugzilla/>
2010-10-01 11:59 ` jakub at gcc dot gnu.org
@ 2011-04-16 10:38 ` jakub at gcc dot gnu.org
2012-03-13 16:11 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-04-16 10:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.4.6 |4.4.7
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/43323] [4.4 Regression] Wrong code with bitfields and type casting.
[not found] <bug-43323-4@http.gcc.gnu.org/bugzilla/>
@ 2010-10-01 11:59 ` jakub at gcc dot gnu.org
2011-04-16 10:38 ` jakub at gcc dot gnu.org
2012-03-13 16:11 ` jakub at gcc dot gnu.org
2 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2010-10-01 11:59 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43323
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.4.5 |4.4.6
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2012-03-13 16:10 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-03-10 15:37 [Bug middle-end/43323] New: Wrong code with bitfields and type casting marbacz at gmail dot com
2010-03-10 15:55 ` [Bug middle-end/43323] [4.4 Regression] " rguenth at gcc dot gnu dot org
2010-03-10 20:05 ` hjl dot tools at gmail dot com
2010-03-11 15:20 ` mikpe at it dot uu dot se
2010-03-13 11:03 ` mikpe at it dot uu dot se
2010-04-30 8:58 ` jakub at gcc dot gnu dot org
[not found] <bug-43323-4@http.gcc.gnu.org/bugzilla/>
2010-10-01 11:59 ` jakub at gcc dot gnu.org
2011-04-16 10:38 ` jakub at gcc dot gnu.org
2012-03-13 16:11 ` jakub at gcc dot gnu.org
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