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* [Bug c/18314] New: Abnormal behavior in optimization
@ 2004-11-05 23:57 lamshuyin at netvigator dot com
2004-11-17 13:08 ` [Bug c/18314] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: lamshuyin at netvigator dot com @ 2004-11-05 23:57 UTC (permalink / raw)
To: gcc-bugs
For this program, -O2 will create an infinite loop:
int test=0;
void main(void)
{
while((volatile int)test!=0);
}
If "volatile int" is not allowed, there should be at least some warning or
error, but it compiles successfully.
--
Summary: Abnormal behavior in optimization
Product: gcc
Version: 3.4.2
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: lamshuyin at netvigator dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i386
GCC host triplet: i386
GCC target triplet: ARM
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18314
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/18314] Abnormal behavior in optimization
2004-11-05 23:57 [Bug c/18314] New: Abnormal behavior in optimization lamshuyin at netvigator dot com
@ 2004-11-17 13:08 ` pinskia at gcc dot gnu dot org
2004-11-17 13:45 ` schwab at suse dot de
2004-11-17 15:46 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-11-17 13:08 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-17 13:08 -------
I think you want:
*(volatile int*)&test
volatile only matters on pointers and types of variables and not casts IIRC.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18314
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/18314] Abnormal behavior in optimization
2004-11-05 23:57 [Bug c/18314] New: Abnormal behavior in optimization lamshuyin at netvigator dot com
2004-11-17 13:08 ` [Bug c/18314] " pinskia at gcc dot gnu dot org
@ 2004-11-17 13:45 ` schwab at suse dot de
2004-11-17 15:46 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: schwab at suse dot de @ 2004-11-17 13:45 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From schwab at suse dot de 2004-11-17 13:45 -------
6.7.3#3: The properties associated with qualified types are meaningful only
for expressions that are lvalues.
This is not a constraint, so not an error.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18314
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/18314] Abnormal behavior in optimization
2004-11-05 23:57 [Bug c/18314] New: Abnormal behavior in optimization lamshuyin at netvigator dot com
2004-11-17 13:08 ` [Bug c/18314] " pinskia at gcc dot gnu dot org
2004-11-17 13:45 ` schwab at suse dot de
@ 2004-11-17 15:46 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-11-17 15:46 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-17 15:46 -------
So this is invalid so closing.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18314
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2004-11-17 15:46 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-11-05 23:57 [Bug c/18314] New: Abnormal behavior in optimization lamshuyin at netvigator dot com
2004-11-17 13:08 ` [Bug c/18314] " pinskia at gcc dot gnu dot org
2004-11-17 13:45 ` schwab at suse dot de
2004-11-17 15:46 ` pinskia at gcc dot gnu dot org
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