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

[Craig Topper via llvm-dev]

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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