[LLVMbugs] [Bug 7757] New: Some ARM instructions contain extra \n when disassembled

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7757

           Summary: Some ARM instructions contain extra \n when
                    disassembled
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sliedes at cc.hut.fi
                CC: llvmbugs at cs.uiuc.edu


Hi,

When I use llvm-mc to disassemble blocks of ARM instructions, some instructions
 contain an extra newline after them. One such instruction is '0xc9 0xff 0x87
0x00' (add pc, r7, r9). For example:

No extra newline (works correctly, instruction '0 0 0 0'):

--------------------------------------------------
$ echo '0 0 0 0'|Debug+Asserts/bin/llvm-mc --disassemble --triple=arm
        andeq   r0, r0, r0
$ echo '0 0 0 0 0 0 0 0' |Debug+Asserts/bin/llvm-mc --disassemble --triple=arm
$ echo '0 0 0 0 0 0 0 0' |Debug+Asserts/bin/llvm-mc --disassemble --triple=arm
        andeq   r0, r0, r0
        andeq   r0, r0, r0
$
--------------------------------------------------

Incorrect extra newline, instruction c9 ff 87 00:

--------------------------------------------------
$ echo '0xc9 0xff 0x87 0x00' |Debug+Asserts/bin/llvm-mc --disassemble
--triple=arm
        add     pc, r7, r9 

$ echo '0xc9 0xff 0x87 0x00 0 0 0 0' |Debug+Asserts/bin/llvm-mc --disassemble
--triple=arm
        add     pc, r7, r9 

        andeq   r0, r0, r0
--------------------------------------------------

As can be seen, there's an extra newline after the add instruction.

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