[llvm-dev] X86 assembler cannot jump NEAR?

[Jun Koi via llvm-dev]

On Sat, Feb 27, 2016 at 3:12 PM, Craig Topper <craig.topper at gmail.com>
wrote:

> I think this is really because the assembler doesn't run layout and
> relaxation when not dumping to an object file. I disassembled an object
> file with this same test case and got e9 00 00 00 00.
>

How can I tell llvm-mc to compile above assembly instruction to an object
file?

Thanks.


> On Fri, Feb 26, 2016 at 9:00 PM, Jun Koi via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi,
>>
>> Currently X86 assembler seems to always compile "jmp _label" as a SHORT
>> jump with "EB" opcode:
>>
>> $ echo "jmp _label"|llvm-mc -assemble -triple=i386 -show-encoding
>>     .text
>>     jmp    _label                  # encoding: [0xeb,A]
>>
>>
>> My question is: can X86 assembler supports NEAR jump with opcode "E9"?
>> I try with "near" keyword, but it is not accepted:
>>
>> $ echo "jmp near _label"|llvm-mc -assemble -triple=i386 -show-encoding
>>     .text
>> <stdin>:1:10: error: unexpected token in argument list
>> jmp near _label
>>          ^
>>
>>
>> Thanks,
>> Jun
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
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>>
>>
>
>
> --
> ~Craig
>
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