[llvm-dev] New pass manager, documentation?

[Arthur Eubanks via llvm-dev]

Yes we should definitely document this somewhere. Does it make sense to add
onto https://llvm.org/docs/WritingAnLLVMBackend.html? Or create a new page
since these hooks aren't only used by backends, but also used by Clang to
add sanitizers and other Clang-specific passes?

On Wed, Feb 24, 2021 at 10:48 AM via llvm-dev <llvm-dev at lists.llvm.org>
wrote:

> > For example, what is the rough equivalent to addPreISel() in the old one
> for running target specific passes shortly before instruction selection
>
> Hello,
>
> Code generation passes including target-specific IR passes (usually these
> specified in derived TargetPassConfig class) are not using the new pass
> manager.  I'm working on switching the code generation to use the new pass
> manager but it is not quite there yet. I guess we should document this fact
> in the new pass manager documentation because I think this question comes
> up once in a while.
>
> - Yuanfang
>
> ________________________________________
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Jon
> Chesterfield via llvm-dev <llvm-dev at lists.llvm.org>
> Sent: Wednesday, February 24, 2021 9:31 AM
> To: llvm-dev
> Subject: [llvm-dev] New pass manager, documentation?
>
> Hi,
>
> I'm trying to work out how to use the new pass manager. For example, what
> is the rough equivalent to addPreISel() in the old one for running target
> specific passes shortly before instruction selection, or how do I run a
> module pass shortly before a function pass.
>
> I have a module pass which works if run shortly before instruction
> selection, but not if it is run via EP_ModuleOptimizerEarly. My current
> plan is to make the pass significantly more complicated, so that it can
> handle being run repeatedly from suboptimal points in the pipeline, but I
> can keep the simple/stupid version instead if I can work out how the pass
> manager works.
>
> Thanks,
>
> Jon
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