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* [Bug target/15781] New: ARM ELF - incorrectly aligned .comm data
@ 2004-06-02 18:19 gcc-bugzilla at gcc dot gnu dot org
2004-06-02 19:49 ` [Bug target/15781] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: gcc-bugzilla at gcc dot gnu dot org @ 2004-06-02 18:19 UTC (permalink / raw)
To: gcc-bugs
Global data (.comm) are improperly aligned on 32-byte boundary.
As a result, 4-byte variables occupy 32 bytes - 78% memory loss.
Environment:
System: Linux hanum.cronyx.ru 2.4.18-5aspsmp #1 SMP Sat Jul 6 19:58:36 EEST 2002 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: /soft/gnu/gcc-3.3.3/configure --prefix=/usr/local/gcc333 --disable-nls --enable-languages=c,c++,ada,java --enable-shared
How-To-Repeat:
Compile and link the following file:
long x;
long y;
_start(){}
Look at "nm -n" output:
00008000 T _start
00008114 A __bss_start
00008114 A __bss_start__
00008114 D __data_start
00008114 A _edata
00008120 B x
00008140 B y
00008144 A __bss_end__
00008144 A _bss_end__
00008144 A _end
00008144 A __end__
00080000 ? _stack
You can see that "x" variable takes 0x20 bytes.
------- Additional Comments From vak at hanoi dot cronyx dot ru 2004-06-02 18:19 -------
Fix:
GCC generates ".comm" directive with alignment in bits,
while GAS expects alignment in bytes. Fix gcc/config/arm/elf.h,
macro ASM_OUTPUT_ALIGNED_COMMON() - divide ALIGN by 8.
--
Summary: ARM ELF - incorrectly aligned .comm data
Product: gcc
Version: 3.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: vak at hanoi dot cronyx dot ru
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15781
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/15781] ARM ELF - incorrectly aligned .comm data
2004-06-02 18:19 [Bug target/15781] New: ARM ELF - incorrectly aligned .comm data gcc-bugzilla at gcc dot gnu dot org
@ 2004-06-02 19:49 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-06-02 19:49 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-06-02 19:49 -------
Fixed on the mainline by:
2003-04-28 Nick Clifton <nickc@redhat.com>
* config/arm/elf.h (ASM_OUTPUT_ALIGNED_COMMON): Remove definition.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
GCC target triplet|i686-pc-linux-gnu |arm-elf
Resolution| |FIXED
Target Milestone|--- |3.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15781
^ permalink raw reply [flat|nested] 2+ messages in thread
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2004-06-02 18:19 [Bug target/15781] New: ARM ELF - incorrectly aligned .comm data gcc-bugzilla at gcc dot gnu dot org
2004-06-02 19:49 ` [Bug target/15781] " pinskia at gcc dot gnu dot org
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