llvm dev - Aug 2015 - Print the Binary Form of an Instruction

Hi all,

I have defined an instruction in the InstFormat.td and InstrInfo.td files.
I also wrote a CodeEmitter class for that, and now I have a .inc file after
compilation that seems like it might be correct, BUT, I would like to see
what will be generated when the assembly code is converted to the binary
machine code!
Is there any command in TableGen or a test class to do so?

Cheers,
ES
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Hi,

If you have an AsmParser implemented, you could put an instruction into
a file and then run it through llvm-mc with the -show-encoding option.
For example:

  llvm-mc -triple=foo -show-encoding test.s

Hope this helps.
Thanks,
Simon

On 17/08/15 09:33, Sky Flyer via llvm-dev wrote:
> Hi all,
> 
> I have defined an instruction in the InstFormat.td and InstrInfo.td
> files. I also wrote a CodeEmitter class for that, and now I have a .inc
> file after compilation that seems like it might be correct, BUT, I would
> like to see what will be generated when the assembly code is converted
> to the binary machine code!
> Is there any command in TableGen or a test class to do so?
> 
> Cheers,
> ES
>

Hello all,
Hello Simon,

Thank you very much for your tutorial "Howto: Implementing LLVM Integrated
Assembler". It was indeed very helpful for me.
I am having a little bit difficulties with the AsmParser which I would like
to postpone for the moment.
I have the LLVM IR for a simple add that I want to see its emitted binary.
Do you think it's possible/doable to give this internal representation to
the CodeEmitter and see the binary representation instead of going through
writing the assembly code, then parsing it, and then run it with the
show-encoding option?
Thanks a lot.

Cheers,
ES


On Mon, Aug 17, 2015 at 1:17 PM, Simon Cook via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hi,
>
> If you have an AsmParser implemented, you could put an instruction into
> a file and then run it through llvm-mc with the -show-encoding option.
> For example:
>
>   llvm-mc -triple=foo -show-encoding test.s
>
> Hope this helps.
> Thanks,
> Simon
>
> On 17/08/15 09:33, Sky Flyer via llvm-dev wrote:
> > Hi all,
> >
> > I have defined an instruction in the InstFormat.td and InstrInfo.td
> > files. I also wrote a CodeEmitter class for that, and now I have a
.inc
> > file after compilation that seems like it might be correct, BUT, I
would
> > like to see what will be generated when the assembly code is converted
> > to the binary machine code!
> > Is there any command in TableGen or a test class to do so?
> >
> > Cheers,
> > ES
> >
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org         http://llvm.cs.uiuc.edu
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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