http://sourceware.org/bugzilla/show_bug.cgi?id=13145
Bug #: 13145
Summary: movem zero offset not removed on ColdFire
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassig...@sources.redhat.com
ReportedBy: vincent.rivi...@freesbee.fr
Classification: Unclassified
Target: m68k-elf
Usually, gas transparently transforms a "register indirect with offset" operand
to a simple "register indirect" when the offset is zero. But this does not
happen with movem on ColdFire.
$ cat bug.s
move.l (%a0),%d0
move.l 0(%a0),%d0
movem.l (%a0),%d0
movem.l 0(%a0),%d0
$ as bug.s -o bug.o -m68000
$ objdump -d bug.o
...
0: 2010 movel %a0@,%d0
2: 2010 movel %a0@,%d0
4: 4cd0 0001 moveml %a0@,%d0
8: 4cd0 0001 moveml %a0@,%d0
We can see that on 68000 a zero offset is ignored, with both move and movem.
Now, to the same for ColdFire:
$ as bug.s -o bug.o -mcpu=5475
$ objdump -d bug.o
...
0: 2010 movel %a0@,%d0
2: 2010 movel %a0@,%d0
4: 4cd0 0001 moveml %a0@,%d0
8: 4ce8 0001 0000 moveml %a0@(0),%d0
We can see that on ColdFire the zero offset is ignored with move, but is kept
unoptimized on ColdFire. This behavior is inconsistent. movem should be fixed
and behave on ColdFire as it works on 68000.
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