[Bug binutils/23242] New: aarch64: objdump requires ignores bits to be set in ldar

[i-bugzilla-sourceware-org-kasujfzh at rf dot risimo.net]

https://sourceware.org/bugzilla/show_bug.cgi?id=23242

            Bug ID: 23242
           Summary: aarch64: objdump requires ignores bits to be set in
                    ldar
           Product: binutils
           Version: 2.30
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: i-bugzilla-sourceware-org-kasujfzh at rf dot risimo.net
  Target Milestone: ---

$ cat ldarb.asm
.global main
.section .text
.balign 4

main:
        ldarb w11,[x5]
        .inst 0x08c0b8ab
        ret
$ as -mcpu=saphira -o ldarb.o ldarb.asm
$ objdump -d ldarb.o 

ldarb.o:     file format elf64-littleaarch64


Disassembly of section .text:

0000000000000000 <main>:
   0:   08dffcab        ldarb   w11, [x5]
   4:   08c0b8ab        .inst   0x08c0b8ab ; undefined
   8:   d65f03c0        ret
$

The bits which differ between 0x08dffcab and 0x08c0b8ab all belong to Rs and 
Rt2. The doc says that these are ignored. From my interpretation this means 
that the bits should be set to 1 by the assembler but the disassembler should 
ignore these bits. So 0x08c0b8ab should also be disassembled as 'ldarb  w11,
[x5]'.

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