[llvm-dev] Regarding PBQP register allocator not working for X86

[Siddharth Jain via llvm-dev]

PBQP is working with clang installed from apt and clang build from source
for AArch64 target but not for X86. Any idea why it could be happening
specifically for the X86 target?

On Wed, Dec 29, 2021 at 12:09 AM Craig Topper <craig.topper at gmail.com>
wrote:

> The registration of register allocators happens via a global static
> variable in RegAllocPBQP.cpp. Perhaps because no functions in that
> function are called from any other file, the file and all its static
> variables got stripped from the binary?
>
> llc and opt both include LinkAllCodegenComponents.h which has a reference
> to a PBQP function which makes the file appear live to the linker. clang
> does not include LinkAllCodegenComponents.h.
>
> ~Craig
>
>
> On Tue, Dec 28, 2021 at 9:58 AM David Blaikie via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> +Lang Hames <lhames at gmail.com> for PBQP questions
>>
>> On Tue, Dec 28, 2021 at 11:49 AM Siddharth Jain via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>>> Hi All,
>>>
>>> I am building LLVM 10.0.1 from source for X86 target, the build
>>> completed successfully but when I am compiling using clang(build from
>>> source) with “regalloc” flag set to “pbqp”, following error is thrown
>>>
>>> "clang (LLVM option parsing): for the --regalloc option: Cannot find
>>> option named 'pbqp'!"
>>>
>>> My query is how can I use the pbqp register allocator with clang(build
>>> from source) for the X86 target?
>>>
>>> Regards,
>>>
>>> Siddharth Jain
>>>
>>>
>>>
>>>
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>

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