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* [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2
@ 2005-10-26 20:55 djohnson+gcc at sw dot starentnetworks dot com
2005-10-26 20:55 ` [Bug c/24548] " djohnson+gcc at sw dot starentnetworks dot com
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: djohnson+gcc at sw dot starentnetworks dot com @ 2005-10-26 20:55 UTC (permalink / raw)
To: gcc-bugs
This looks similar to bug 19449, but with just __builtin_constant_p not
__builtin_choose_expr so I'm opening a new bug for this.
The following code works with 3.3.6, but with 3.4.4 it fails to resolve
__builtin_constant_p leading to link errors of unresolved symbols.
Code I'm seeing this in is linux 2.6.12 built for arm. The occurance gcc is
having problems with is alloc_skb()'s call to kmalloc(). That call is for a
non-constant variable (size) so __builtin_constant_p() should result in zero.
Problem is present with -O2, however -O1 is resolving __builtin_constant_p
correctly.
I'll attach full preprocessed output as well as compiled output.
Compile line is:
arm-linux-gcc -Wp,-MD,net/core/.skbuff.o.d -nostdinc -isystem
/net/gia/djohnson/tools/usr/local/starent/bintools/linux-arm/gcc/200510261510/lib/gcc/arm-linux/3.4.4/include
-D__KERNEL__ -Iinclude -mbig-endian -Wall -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -ffreestanding -O2 -fno-omit-frame-pointer
-g -fno-omit-frame-pointer -mapcs -mno-sched-prolog -mapcs-32
-D__LINUX_ARM_ARCH__=5 -march=armv5te -mtune=xscale -Wa,-mcpu=xscale
-malignment-traps -msoft-float -Uarm -Wdeclaration-after-statement
-DKBUILD_BASENAME=skbuff -DKBUILD_MODNAME=skbuff -c -o net/core/.tmp_skbuff.o
net/core/skbuff.c
arm-linux-nm net/core/.tmp_skbuff.o |grep that_much
U __you_cannot_kmalloc_that_much
--
Summary: 3.4 regression: __builtin_constant_p not resolved with -
O2
Product: gcc
Version: 3.4.4
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: djohnson+gcc at sw dot starentnetworks dot com
GCC build triplet: i686-linux
GCC host triplet: i686-linux
GCC target triplet: arm-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c/24548] 3.4 regression: __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com @ 2005-10-26 20:55 ` djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:56 ` djohnson+gcc at sw dot starentnetworks dot com ` (6 subsequent siblings) 7 siblings, 0 replies; 9+ messages in thread From: djohnson+gcc at sw dot starentnetworks dot com @ 2005-10-26 20:55 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:55 ------- Created an attachment (id=10066) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10066&action=view) preprocessed output -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c/24548] 3.4 regression: __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:55 ` [Bug c/24548] " djohnson+gcc at sw dot starentnetworks dot com @ 2005-10-26 20:56 ` djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 21:25 ` [Bug middle-end/24548] " pinskia at gcc dot gnu dot org ` (5 subsequent siblings) 7 siblings, 0 replies; 9+ messages in thread From: djohnson+gcc at sw dot starentnetworks dot com @ 2005-10-26 20:56 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:56 ------- Created an attachment (id=10067) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10067&action=view) compiler output -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/24548] 3.4 regression: __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:55 ` [Bug c/24548] " djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:56 ` djohnson+gcc at sw dot starentnetworks dot com @ 2005-10-26 21:25 ` pinskia at gcc dot gnu dot org 2006-06-04 20:00 ` [Bug middle-end/24548] [4.0/4.1/4.2 Regression] " jsm28 at gcc dot gnu dot org ` (4 subsequent siblings) 7 siblings, 0 replies; 9+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-10-26 21:25 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2005-10-26 21:25 ------- I don't think this is a GCC bug as what is happening is that something is being inlined which did not get inlined before. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/24548] [4.0/4.1/4.2 Regression] __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com ` (2 preceding siblings ...) 2005-10-26 21:25 ` [Bug middle-end/24548] " pinskia at gcc dot gnu dot org @ 2006-06-04 20:00 ` jsm28 at gcc dot gnu dot org 2006-08-27 20:18 ` [Bug middle-end/24548] [4.0/4.1 " pinskia at gcc dot gnu dot org ` (3 subsequent siblings) 7 siblings, 0 replies; 9+ messages in thread From: jsm28 at gcc dot gnu dot org @ 2006-06-04 20:00 UTC (permalink / raw) To: gcc-bugs -- jsm28 at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|3.4 regression: |[4.0/4.1/4.2 Regression] |__builtin_constant_p not |__builtin_constant_p not |resolved with -O2 |resolved with -O2 Target Milestone|--- |4.1.2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/24548] [4.0/4.1 Regression] __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com ` (3 preceding siblings ...) 2006-06-04 20:00 ` [Bug middle-end/24548] [4.0/4.1/4.2 Regression] " jsm28 at gcc dot gnu dot org @ 2006-08-27 20:18 ` pinskia at gcc dot gnu dot org 2007-02-14 9:08 ` mmitchel at gcc dot gnu dot org ` (2 subsequent siblings) 7 siblings, 0 replies; 9+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-08-27 20:18 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from pinskia at gcc dot gnu dot org 2006-08-27 20:18 ------- This works for me on the mainline. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[4.0/4.1/4.2 Regression] |[4.0/4.1 Regression] |__builtin_constant_p not |__builtin_constant_p not |resolved with -O2 |resolved with -O2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/24548] [4.0/4.1 Regression] __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com ` (4 preceding siblings ...) 2006-08-27 20:18 ` [Bug middle-end/24548] [4.0/4.1 " pinskia at gcc dot gnu dot org @ 2007-02-14 9:08 ` mmitchel at gcc dot gnu dot org 2007-11-28 17:33 ` manu at gcc dot gnu dot org 2008-01-26 12:12 ` [Bug middle-end/24548] [4.0 " rguenth at gcc dot gnu dot org 7 siblings, 0 replies; 9+ messages in thread From: mmitchel at gcc dot gnu dot org @ 2007-02-14 9:08 UTC (permalink / raw) To: gcc-bugs -- mmitchel at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|4.1.2 |4.1.3 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/24548] [4.0/4.1 Regression] __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com ` (5 preceding siblings ...) 2007-02-14 9:08 ` mmitchel at gcc dot gnu dot org @ 2007-11-28 17:33 ` manu at gcc dot gnu dot org 2008-01-26 12:12 ` [Bug middle-end/24548] [4.0 " rguenth at gcc dot gnu dot org 7 siblings, 0 replies; 9+ messages in thread From: manu at gcc dot gnu dot org @ 2007-11-28 17:33 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from manu at gcc dot gnu dot org 2007-11-28 17:32 ------- Dave, could you check this with a recent release? -- manu at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |manu at gcc dot gnu dot org Status|UNCONFIRMED |WAITING http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/24548] [4.0 Regression] __builtin_constant_p not resolved with -O2 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com ` (6 preceding siblings ...) 2007-11-28 17:33 ` manu at gcc dot gnu dot org @ 2008-01-26 12:12 ` rguenth at gcc dot gnu dot org 7 siblings, 0 replies; 9+ messages in thread From: rguenth at gcc dot gnu dot org @ 2008-01-26 12:12 UTC (permalink / raw) To: gcc-bugs ------- Comment #6 from rguenth at gcc dot gnu dot org 2008-01-26 12:02 ------- Works for me with 4.1.3. -- rguenth at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution| |FIXED Summary|[4.0/4.1 Regression] |[4.0 Regression] |__builtin_constant_p not |__builtin_constant_p not |resolved with -O2 |resolved with -O2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24548 ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2008-01-26 12:03 UTC | newest] Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-10-26 20:55 [Bug c/24548] New: 3.4 regression: __builtin_constant_p not resolved with -O2 djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:55 ` [Bug c/24548] " djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 20:56 ` djohnson+gcc at sw dot starentnetworks dot com 2005-10-26 21:25 ` [Bug middle-end/24548] " pinskia at gcc dot gnu dot org 2006-06-04 20:00 ` [Bug middle-end/24548] [4.0/4.1/4.2 Regression] " jsm28 at gcc dot gnu dot org 2006-08-27 20:18 ` [Bug middle-end/24548] [4.0/4.1 " pinskia at gcc dot gnu dot org 2007-02-14 9:08 ` mmitchel at gcc dot gnu dot org 2007-11-28 17:33 ` manu at gcc dot gnu dot org 2008-01-26 12:12 ` [Bug middle-end/24548] [4.0 " rguenth at gcc dot gnu dot org
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