<div dir="ltr">Hi Saleem,<div>I have a similar situation - I'd appreciate your inputs on it. I noticed that the obj file generated using llvm does not contain "thumb" instructions. I suspect that is what is causing runtime crash for me.</div>
<div><br></div><div><br></div><div>Here's what I've tried -</div><div>Start with a.c (on my linux machine where I have llvm/clang built as of yesterday) </div><div><div> int add(int i, int j) {int k = i + j; return k; }</div>
</div><div><div>clang -S -O0 a.c</div><div>llc -filetype=obj -mtriple=thumbv7-windows -O0 a.ll</div></div><div><br></div><div>I get a.obj from the above steps.</div><div><br></div><div>I take this a.obj over to my windows 8.1 machine where I have VS2013 update 2 installed</div>
<div><br></div><div>I open up a command window and run </div><div><div>C:\Users\kck\arm>"c:\Program Files (x86)\Microsoft Visual Studio 12.0\vc\bin\x86_arm\vcvarsx86_arm.bat"</div></div><div><br></div><div>I create a file file m.c </div>
<div><div>int main() { return add(20,30);}</div></div><div><br></div><div>I build the whole thing like this -</div><div><br></div><div>cl m.c a.obj</div><div><br></div><div>Things seem to work fine and m.exe gets generated.</div>
<div><br></div><div>However I noticed a difference in the dumpbin output for a.obj and m.obj - In m.obj, I can see "Thumb instructions" where as in a.obj, I don't see that.</div><div><br></div><div>I'd appreciate any pointers on this.</div>
<div><br></div><div>Regards,</div><div>Kashyap</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 30, 2014 at 10:45 PM, Saleem Abdulrasool <span dir="ltr"><<a href="mailto:abdulras@fb.com" target="_blank">abdulras@fb.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class=""><br>
On May 28, 2014, at 5:18 AM, Rajat Mahajan <<a href="mailto:rmahajan@adobe.com">rmahajan@adobe.com</a>> wrote:<br>
<br>
> I am talking about Windows Mobile 8 and 8.1 and not CE.<br>
> Not sure though that the Windows 8 (ARM NT) is similar to Windows Mobile 8 platform.<br>
><br>
> I used the following command to generate the obj file<br>
> Llc.exe -mtriple=thumbv7-windows -filetype=obj <some_name>.bc<br>
><br>
> The object file generated in the above object doesn't get linked when I try to link it with the windows mobile library as it fails to recognize the object format. ( Not a valid object file )<br>
><br>
> Hope I am clear.<br>
<br>
</div>Unfortunately, you have merely repeated your previous statement. I don’t have enough here to diagnose nor even speculate what is going on.<br>
<br>
If you can provide the object file, it would be helpful as I am unable to reproduce this issue. Although, I ran it via clang, I see no reason that the output would be different as the backend is the same.<br>
<br>
The triple is certainly correct (particularly for llc, clang will treat armv7-windows as thumbv7-windows). How did you generate the bit code? My testing has usually started from C or LLVM IR rather than bit code, but, I suspect that shouldn’t be a real issue.<br>
<br>
With the given information, the only thing that comes to mind is that your environment is setup improperly, resulting in the wrong link.exe being invoked.<br>
<div class="HOEnZb"><div class="h5"><br>
> ~rajat<br>
><br>
> -----Original Message-----<br>
> From: Saleem Abdulrasool [mailto:<a href="mailto:abdulras@fb.com">abdulras@fb.com</a>]<br>
> Sent: Friday, May 16, 2014 11:23 PM<br>
> To: Rajat Mahajan<br>
> Cc: <a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a><br>
> Subject: Re: [LLVMdev] Code generation support in llvm for windows phone<br>
><br>
><br>
> On May 16, 2014, at 6:53 AM, Rajat Mahajan <<a href="mailto:rmahajan@adobe.com">rmahajan@adobe.com</a>> wrote:<br>
><br>
>> Hi,<br>
>><br>
>> Is there support available in llc to convert llvm bytecode to Windows Mobile binary?<br>
>> I have tried triples like arm-pc-win32 , thumbv7-window ... but the object file generated is not getting linked to the windows native project.<br>
>> Any pointers will be greatly appreciated?<br>
><br>
> As Reid mentioned, I have been working on this recently. Just to make sure that we are talking about the same environment, I assume that you are talking about Windows 8 (ARM NT) rather than the Windows CE based environment.<br>
><br>
> Can you please explain what exactly you mean by "the object file generated is not getting linked to the windows native project". The object file that we generate should be pretty compatible with MSVC. If you have specific cases where we are generating something that is incompatible, I would be quite interested in hearing about that.<br>
><br>
>> Thanks,<br>
>> ~rajat<br>
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> --<br>
> Saleem Abdulrasool<br>
> abdulras (at) fb (dot) com<br>
><br>
><br>
><br>
><br>
><br>
<br>
--<br>
Saleem Abdulrasool<br>
abdulras (at) fb (dot) com<br>
<br>
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