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* [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode)
@ 2013-09-13 21:04 su at cs dot ucdavis.edu
2013-09-13 22:02 ` [Bug middle-end/58418] [4.9 Regression] " hjl.tools at gmail dot com
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-09-13 21:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58418
Bug ID: 58418
Summary: wrong code at -O2 and -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 produces wrong code for the attached testcase on
x86_64-linux-gnu when compiled at -O2 and -O3 in 32-bit mode.
It appears to be 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 -O1 small.c
$ a.out
0
$ gcc-4.8 -m32 -O2 small.c
$ a.out
0
$ gcc-trunk -m64 -O2 small.c
$ a.out
0
$ gcc-trunk -m32 -O2 small.c
$ a.out
1
$
------------------------------------------
int printf (const char *, ...);
int a, b, *c = &b, d = -1, e, f, *g, *h = &f, **i = &g, j;
unsigned int
foo (unsigned int p)
{
return p == 0 ? 0 : 1 / p;
}
static int *
bar ()
{
*c = *h = foo (d) & (-9 < d);
for (e = 0; e; e++)
;
return 0;
}
int
main ()
{
for (; j; j++)
for (;; a--)
;
*i = bar ();
printf ("%d\n", f);
return 0;
}
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug middle-end/58418] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) 2013-09-13 21:04 [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) su at cs dot ucdavis.edu @ 2013-09-13 22:02 ` hjl.tools at gmail dot com 2013-09-16 15:12 ` vmakarov at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: hjl.tools at gmail dot com @ 2013-09-13 22:02 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58418 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 -O2 and -O3 |[4.9 Regression] wrong code |on x86_64-linux-gnu (in |at -O2 and -O3 on |32-bit mode) |x86_64-linux-gnu (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] 6+ messages in thread
* [Bug middle-end/58418] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) 2013-09-13 21:04 [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) su at cs dot ucdavis.edu 2013-09-13 22:02 ` [Bug middle-end/58418] [4.9 Regression] " hjl.tools at gmail dot com @ 2013-09-16 15:12 ` vmakarov at gcc dot gnu.org 2013-09-16 19:29 ` law at redhat dot com ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: vmakarov at gcc dot gnu.org @ 2013-09-16 15:12 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58418 --- Comment #2 from Vladimir Makarov <vmakarov at gcc dot gnu.org> --- Author: vmakarov Date: Mon Sep 16 15:12:22 2013 New Revision: 202630 URL: http://gcc.gnu.org/viewcvs?rev=202630&root=gcc&view=rev Log: 2013-09-16 Vladimir Makarov <vmakarov@redhat.com> PR middle-end/58418 * lra-constraints.c (undo_optional_reloads): Consider all optional reload even if it did not get a hard reg. 2013-09-16 Vladimir Makarov <vmakarov@redhat.com> * gcc.target/i386/pr58418.c: New. Added: trunk/gcc/testsuite/gcc.target/i386/pr58418.c Modified: trunk/gcc/ChangeLog trunk/gcc/lra-constraints.c trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/58418] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) 2013-09-13 21:04 [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) su at cs dot ucdavis.edu 2013-09-13 22:02 ` [Bug middle-end/58418] [4.9 Regression] " hjl.tools at gmail dot com 2013-09-16 15:12 ` vmakarov at gcc dot gnu.org @ 2013-09-16 19:29 ` law at redhat dot com 2013-09-17 7:52 ` rguenth at gcc dot gnu.org 2013-10-30 13:41 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: law at redhat dot com @ 2013-09-16 19:29 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58418 --- Comment #3 from Jeffrey A. Law <law at redhat dot com> --- *** Bug 58431 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/58418] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) 2013-09-13 21:04 [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) su at cs dot ucdavis.edu ` (2 preceding siblings ...) 2013-09-16 19:29 ` law at redhat dot com @ 2013-09-17 7:52 ` rguenth at gcc dot gnu.org 2013-10-30 13:41 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2013-09-17 7:52 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58418 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/58418] [4.9 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) 2013-09-13 21:04 [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) su at cs dot ucdavis.edu ` (3 preceding siblings ...) 2013-09-17 7:52 ` rguenth at gcc dot gnu.org @ 2013-10-30 13:41 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ 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=58418 --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- *** Bug 58419 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-10-30 13:41 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-09-13 21:04 [Bug middle-end/58418] New: wrong code at -O2 and -O3 on x86_64-linux-gnu (in 32-bit mode) su at cs dot ucdavis.edu 2013-09-13 22:02 ` [Bug middle-end/58418] [4.9 Regression] " hjl.tools at gmail dot com 2013-09-16 15:12 ` vmakarov at gcc dot gnu.org 2013-09-16 19:29 ` law at redhat dot com 2013-09-17 7:52 ` rguenth at gcc dot gnu.org 2013-10-30 13:41 ` rguenth at gcc dot gnu.org
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