[llvm-dev] Use Global ISel or SelectionDAG

floris westermann via llvm-dev llvm-dev at lists.llvm.org
Thu Feb 13 15:06:02 PST 2020

Hi matt,
Thanks for your advice, ill stick to SelectionDAG then, since my target
isn't that strange and I'll have more examples to look at.


On Thu, Feb 13, 2020, 11:59 PM Matt Arsenault <arsenm2 at gmail.com> wrote:

> > On Feb 13, 2020, at 17:08, floris westermann via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Hi llvm-dev,
> >
> > I am currently writing a backend for an architecture I am designing in
> my bachelor's thesis and recently came across the GlobalISel Selection
> Framework.
> > Should already start using this over the more common Selection DAG?
> > Being new llvm backend development, I am not sure if GlobalISel would be
> "easier" to implement than ISelDAG and if there is any decent documentation
> on how to do so.
> >
> > Cheers,
> > Floris
> I think it depends on how much you care about optimization, how weird your
> target is, and how long you plan to maintain it. If you don’t care about
> optimization, and have a very strange target, you would probably be better
> off with GlobalISel. There will be fewer examples to work with however.
> -Matt
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