c/6916: Wrong assembler code for ARM/Thumb
omakarenko@cyberplat.ru
omakarenko@cyberplat.ru
Mon Jun 3 04:56:00 GMT 2002
>Number: 6916
>Category: c
>Synopsis: Wrong assembler code for ARM/Thumb
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Mon Jun 03 04:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: omakarenko@cyberplat.ru
>Release: unknown-1.0
>Organization:
>Environment:
GNU C version 3.1 (arm-elf)
compiled by GNU C version 2.96 20000731 (RedHat Linux 7.3 2.96-110)
Configured with: /home/oleg/arm/tools/gcc/configure --target=arm-elf --enable-languages=c,c++ --disable-shared --disable-nls --with-gnu-as --with-gnu-ld --disable-checking -
-with-multilibs --with-newlib --disable-newlib-io-float
Thread model:single
>Description:
The following simple file when compiled with
arm-elf-gcc -o test.Os.s -S -Os -mthumb test.c
produces code like:
ldr r3, [r3, sp]
which is wrong for Thumb mode (sp can not be used in thumb mode)
gas then complains with "Error: lo register required"
-O2 and -O3 give the same result.
>How-To-Repeat:
arm-elf-gcc -o test.Os.s -S -Os test.c
or
arm-elf-gcc -o test.Os.o -c -Os test.c
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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