[llvm-dev] Manipulate Register allocation in basic block level

[Quentin Colombet via llvm-dev]

Hi Nisal,

We didn’t have any use case for this kind of things, so no, we don’t have anything to do that.

What you could do is split the live-ranges you are interested in in the place you care and use TargetRegisterInfo::getRegAllocationHints to bias the allocation the way you want.

Cheers,
-Quentin
> On Sep 5, 2017, at 6:09 AM, Nisal Menuka via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi,
> Is it possible to annotate basic blocks in order to manipulate them in
> LLVM backend with fine granularity?
> 
> Eg: I want to reserve registers for some parts of the code, therefore
> need to stop register allocator from using some registers only in
> specific basic blocks.
> 
> Thanks
> Nisal
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