llvm dev - Feb 2021 - 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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+Arthur


On Wed, Feb 24, 2021 at 9:31 AM Jon Chesterfield via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> 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
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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> 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