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* [Bug middle-end/58419] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
@ 2013-09-13 23:19 su at cs dot ucdavis.edu
2013-09-13 23:45 ` [Bug middle-end/58419] [4.9 Regression] " hjl.tools at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-09-13 23:19 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58419
Bug ID: 58419
Summary: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The current gcc trunk mis-compiles the following code on x86_64-linux at -O3 in
32-bit mode.
This is a regression from 4.8.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure
--enable-languages=c,c++,objc,obj-c++,fortran,lto
--with-gmp=/usr/local/gcc-trunk --with-mpfr=/usr/local/gcc-trunk
--with-mpc=/usr/local/gcc-trunk --with-cloog=/usr/local/gcc-trunk
--prefix=/usr/local/gcc-trunk
Thread model: posix
gcc version 4.9.0 20130913 (experimental) [trunk revision 202556] (GCC)
$ gcc-trunk -m32 -O2 small.c
$ a.out
0
$ gcc-4.8 -m32 -O3 small.c
$ a.out
0
$ gcc-trunk -m64 -O3 small.c
$ a.out
0
$ gcc-trunk -m32 -O3 small.c
$ a.out
Segmentation fault (core dumped)
$
-----------------------------------
int printf(const char *, ...);
int a, g, i, k, *p;
char b, e;
short c, h;
static short *d = &c;
char
foo (int p1, int p2)
{
return p1 - p2;
}
int
bar ()
{
short *q = &c;
*q = 1;
*p = 0;
return 0;
}
int
main ()
{
for (b = -22; b >= -29; b--)
{
short *l = &h;
char *m = &e;
*l = a;
g = foo (*m = k && *d, 1 > i) || bar ();
}
printf("0\n");
return 0;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/58419] [4.9 Regression] wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
2013-09-13 23:19 [Bug middle-end/58419] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
@ 2013-09-13 23:45 ` hjl.tools at gmail dot com
2013-09-13 23:48 ` su at cs dot ucdavis.edu
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2013-09-13 23:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58419
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-09-13
CC| |vmakarov at redhat dot com
Target Milestone|--- |4.9.0
Summary|wrong code at -O3 on |[4.9 Regression] wrong code
|x86_64-linux-gnu in 32-bit |at -O3 on x86_64-linux-gnu
|mode |in 32-bit mode
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by r202468.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/58419] [4.9 Regression] wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
2013-09-13 23:19 [Bug middle-end/58419] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2013-09-13 23:45 ` [Bug middle-end/58419] [4.9 Regression] " hjl.tools at gmail dot com
@ 2013-09-13 23:48 ` su at cs dot ucdavis.edu
2013-09-16 15:14 ` vmakarov at redhat dot com
2013-10-30 13:41 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-09-13 23:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58419
--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to H.J. Lu from comment #1)
> It is caused by r202468.
So it may have been a dup of 58418?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/58419] [4.9 Regression] wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
2013-09-13 23:19 [Bug middle-end/58419] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2013-09-13 23:45 ` [Bug middle-end/58419] [4.9 Regression] " hjl.tools at gmail dot com
2013-09-13 23:48 ` su at cs dot ucdavis.edu
@ 2013-09-16 15:14 ` vmakarov at redhat dot com
2013-10-30 13:41 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: vmakarov at redhat dot com @ 2013-09-16 15:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58419
--- Comment #3 from Vladimir Makarov <vmakarov at redhat dot com> ---
(In reply to Zhendong Su from comment #2)
> (In reply to H.J. Lu from comment #1)
> > It is caused by r202468.
>
> So it may have been a dup of 58418?
Yes, it is a duplication.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/58419] [4.9 Regression] wrong code at -O3 on x86_64-linux-gnu in 32-bit mode
2013-09-13 23:19 [Bug middle-end/58419] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
` (2 preceding siblings ...)
2013-09-16 15:14 ` vmakarov at redhat dot com
@ 2013-10-30 13:41 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-10-30 13:41 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58419
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 58418 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-10-30 13:41 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2013-09-13 23:19 [Bug middle-end/58419] New: wrong code at -O3 on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2013-09-13 23:45 ` [Bug middle-end/58419] [4.9 Regression] " hjl.tools at gmail dot com
2013-09-13 23:48 ` su at cs dot ucdavis.edu
2013-09-16 15:14 ` vmakarov at redhat dot com
2013-10-30 13:41 ` rguenth at gcc dot gnu.org
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