[LLVMdev] pbqp register allocator-need help

[Lang Hames]

Hi Smriti,

What version of LLVM are you using? Unfortunately there was a bug in the
PBQP allocator in 3.2 and 3.3 LLVM releases. This bug has been corrected in
the development branch.

If you're building LLVM from source you can fix the bug by applying patches
r181973 and r185378. These should apply cleanly to the source for LLVM 3.2
and 3.3.

If you're still having problems please let me know - I'm very happy to help
you get this working.

Cheers,
Lang.



On Mon, Aug 12, 2013 at 12:05 AM, Smriti Jaiswal
<jaiswal.smriti at gmail.com>wrote:

> The simple C code on which im running the allocator is attached.
> And these are the set of commands. I dont understand ..guess i might be
> doing something very silly.
> Please help
>
> *Commands:*
>
> clang -emit-llvm -c test.c -o test.bc
> opt -mem2reg test.bc -o testssa.bc
> llc -regalloc=pbqp testssa.bc
>
>
> On Mon, Aug 12, 2013 at 7:59 AM, David Blaikie <dblaikie at gmail.com> wrote:
>
>>
>>
>>
>> On Sun, Aug 11, 2013 at 12:36 AM, Smriti Jaiswal <
>> jaiswal.smriti at gmail.com> wrote:
>>
>>> Hello Sir,
>>>
>>> Im trying to test run pbqp register allocator for small C programs.
>>>
>>> by
>>>
>>> llc -regalloc=pbqp -debug <bitcode of the file>
>>>
>>> It is giving me segmentation fault for even very simple programs having
>>> loops or if statements.
>>> Please tell me where I'm going wrong.
>>>
>>
>> Could you provide a specific example file (preferably a particularly
>> simple one) that reproduces this problem? (along with the exact command
>> line)
>>
>> if you can repro this crash with C source and Clang, the Clang crash
>> reporting mechanisms (it will provide a .sh and .i file & instruct you to
>> attach those files to a bug report) are quite handy when reporting bugs.
>>
>
>
>
> --
> Regards,
> Smriti Jaiswal
> MTech
> Dept of Computer Science and Engg,
> IIT Kanpur
>
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