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2013 Nov 03
0
[LLVMdev] DominanceFrontier/PostDominanceFrontier for PRE
...simply want to write a PRE pass to get a better understanding of the
transformation. Any tips on where to get started (beyond the papers you
provided) for someone -new- to the game?
>
> If you want to implement the original SSAPRE, i suggest looking at
> http://jcse.kiise.org/posting/2-3/jcse_2-3_31.pdf
>
>
Thanks - I will read through this paper.
Chris
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2013 Nov 04
1
[LLVMdev] DominanceFrontier/PostDominanceFrontier for PRE
...calar/GVNPRE.cpp?revision=80766&view=markup&pathrev=83192
(GVNPRE)
Making a worthwhile PRE that is not slow tends to be quite an engineering task.
>
>>
>>
>> If you want to implement the original SSAPRE, i suggest looking at
>> http://jcse.kiise.org/posting/2-3/jcse_2-3_31.pdf
>>
>
> Thanks - I will read through this paper.
>
> Chris
2013 Nov 03
4
[LLVMdev] DominanceFrontier/PostDominanceFrontier for PRE
...ould not).
As for a "better" way to implement PRE, it depends on what algorithm
you want to use. If you just want to write a PRE pass, that's easy
enough without dominance frontiers.
If you want to implement the original SSAPRE, i suggest looking at
http://jcse.kiise.org/posting/2-3/jcse_2-3_31.pdf
On Fri, Nov 1, 2013 at 11:33 PM, Shuxin Yang <shuxin.llvm at gmail.com> wrote:
> Hi,
>
> I'm not able to answer your question. I'm wondering if you can create
> your own if it is just your own hobby project,
> or a project that you don't have to commi...
2013 Nov 02
0
[LLVMdev] DominanceFrontier/PostDominanceFrontier for PRE
Hi,
I'm not able to answer your question. I'm wondering if you can
create your own if it is just your own hobby project,
or a project that you don't have to commit to the main repository.
Creating DominatorFrontier seems to be expensive. However, if you
are using bit-vector to represent a basic-block-set, I
guess it can be done in linear time in practice. Following is the
2013 Nov 02
2
[LLVMdev] DominanceFrontier/PostDominanceFrontier for PRE
Hi all,
Does anyone know how to recreate the DominanceFronter and
PostDominanceFrontier structures using the API of the latest release? To my
knowledge, these are needed to implement a PRE pass (as done in the
past<https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_13/lib/Transforms/Scalar/PRE.cpp>),
but they were removed a while ago for efficiency reasons. Is there a better
way to