public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug driver/48832] New: -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q
@ 2011-04-30 12:00 marcus at jet dot franken.de
2011-05-02 10:26 ` [Bug driver/48832] " rguenth at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: marcus at jet dot franken.de @ 2011-04-30 12:00 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48832
Summary: -O2 does not imply -fomit-frame-pointer, contrary to
--help=optimizers -v -Q
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: marcus@jet.franken.de
Host: x86_64-suse-linux
Target: i586-suse-linux
Build: i586-suse-linux
$ gcc -v -O2 -m32 -Q --help=optimizers 2>&1|grep omit-frame
-fomit-frame-pointer [enabled]
$ cat >xx.c
int f() { return 1; }
$ gcc -O2 -m32 -c xx.c ; objdump -d xx.o
...
00000000 <f>:
0: 55 push %ebp
1: b8 01 00 00 00 mov $0x1,%eax
6: 89 e5 mov %esp,%ebp
8: 5d pop %ebp
9: c3 ret
$
seems gcc is lying in --help=optimizers
I cannot see why in the sources though.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/48832] -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q
2011-04-30 12:00 [Bug driver/48832] New: -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q marcus at jet dot franken.de
@ 2011-05-02 10:26 ` rguenth at gcc dot gnu.org
2011-05-02 19:55 ` marcus at jet dot franken.de
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-05-02 10:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48832
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2011.05.02 10:24:33
Ever Confirmed|0 |1
--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-02 10:24:33 UTC ---
Works for me:
> gcc-4.6 -S t.c -m32 -O2
> cat t.s
.file "t.c"
.text
.p2align 4,,15
.globl f
.type f, @function
f:
.LFB0:
movl $1, %eax
ret
...
please show us that output from -v
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/48832] -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q
2011-04-30 12:00 [Bug driver/48832] New: -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q marcus at jet dot franken.de
2011-05-02 10:26 ` [Bug driver/48832] " rguenth at gcc dot gnu.org
@ 2011-05-02 19:55 ` marcus at jet dot franken.de
2011-05-03 11:21 ` rguenth at gcc dot gnu.org
2011-05-03 16:56 ` marcus at jet dot franken.de
3 siblings, 0 replies; 5+ messages in thread
From: marcus at jet dot franken.de @ 2011-05-02 19:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48832
marcus at jet dot franken.de changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|4.6.0 |4.7.0
--- Comment #2 from marcus at jet dot franken.de 2011-05-02 19:48:25 UTC ---
Ok, I tested 4.5 and TRUNK.
both 4.5 and TRUNK have the ebp frame setup.
gcc-4.6 does not.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/48832] -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q
2011-04-30 12:00 [Bug driver/48832] New: -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q marcus at jet dot franken.de
2011-05-02 10:26 ` [Bug driver/48832] " rguenth at gcc dot gnu.org
2011-05-02 19:55 ` marcus at jet dot franken.de
@ 2011-05-03 11:21 ` rguenth at gcc dot gnu.org
2011-05-03 16:56 ` marcus at jet dot franken.de
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-05-03 11:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48832
--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-03 11:15:30 UTC ---
On the 4.5 branch this is expected. On trunk I get as well
> ./xgcc -B. -S t.c -m32 -O2
> cat t.s
.file "t.c"
.text
.p2align 4,,15
.globl f
.type f, @function
f:
.LFB0:
movl $1, %eax
ret
how did you configure? What is the output of the gcc command when appending
-v?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/48832] -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q
2011-04-30 12:00 [Bug driver/48832] New: -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q marcus at jet dot franken.de
` (2 preceding siblings ...)
2011-05-03 11:21 ` rguenth at gcc dot gnu.org
@ 2011-05-03 16:56 ` marcus at jet dot franken.de
3 siblings, 0 replies; 5+ messages in thread
From: marcus at jet dot franken.de @ 2011-05-03 16:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48832
marcus at jet dot franken.de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution| |INVALID
--- Comment #4 from marcus at jet dot franken.de 2011-05-03 16:46:31 UTC ---
configured by /mp3/gcc.trunk/configure, generated by GNU Autoconf 2.64,
with options \" '--prefix=/mp3/buildgcc/BIN' '--enable-lto'
'--enable-checking' '--enable-frame-pointer' '--enable-languages=c,lto'\"
oops. not sure where this came from, but I suspect from an earlier debugging
attempt.
so please disregard, my faul.t
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-05-03 16:56 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-04-30 12:00 [Bug driver/48832] New: -O2 does not imply -fomit-frame-pointer, contrary to --help=optimizers -v -Q marcus at jet dot franken.de
2011-05-02 10:26 ` [Bug driver/48832] " rguenth at gcc dot gnu.org
2011-05-02 19:55 ` marcus at jet dot franken.de
2011-05-03 11:21 ` rguenth at gcc dot gnu.org
2011-05-03 16:56 ` marcus at jet dot franken.de
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).