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Date: Thu, 30 May 2002 13:36:00 -0000
From: mmitchel@qualcomm.com
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To: gcc-gnats@gcc.gnu.org
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Subject: c/6873: Improper Alignment Parameters Emitted by Compiler for .comm Section
X-SW-Source: 2002-05/txt/msg00998.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         6873
>Category:       c
>Synopsis:       Improper Alignment Parameters Emitted by Compiler for .comm Section
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 30 13:26:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     mmitchel@qualcomm.com
>Release:        gcc version 3.1 arm-elf
>Organization:
>Environment:
cross compile, windows nt, cygwin

$ arm-elf-gcc -v
Reading specs from /gnude/lib/gcc-lib/arm-elf/3.1/specs
Configured with: ../src/configure --target=arm-elf --host=i686-pc-cygwin --prefi
x=/gnude --with-local-prefix=/gnude/local --with-gnu-as --with-gnu-ld
Thread model: single
gcc version 3.1
>Description:
The compiler not emitting correct assembly output for following example:

$ more test.c
int i;
int j;
$ arm-elf-gcc -S test.c
$ more test.s
        .file   "test.c"
        .comm   i, 4, 32
        .comm   j, 4, 32
        .ident  "GCC: (GNU) 3.1"

the third paramater, alignment parameter, to the .comm pseudo op is incorrect.

Incorrect output impacts memory use and requirements of generating small code for embedded targets.
>How-To-Repeat:

>Fix:
In the file gcc\config\arm\elf.h, at line 172, scale the parameter ALIGN by dividing by BITS_PER_UNIT. This is how this macro is implemented for other targets; this may be an undesired omission for this target.
>Release-Note:
>Audit-Trail:
>Unformatted: