[llvm-dev] [RFC] Introducing classes for the codegen driven by new pass manager

[Chen, Yuanfang via llvm-dev]

In codegen with NPM, I've made all codegen passes (IR or MIR pass) to be only driven by `llc`. Both due to the way NPM registering pass (on-demand&dynamic instead of static initialization in Legacy PM), and reduce the confusion about which tool (`llc` or `opt`) to test codegen IR passes.

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From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Matt Arsenault via llvm-dev <llvm-dev at lists.llvm.org>
Sent: Wednesday, July 15, 2020 6:57 AM
To: Robinson, Paul
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] [RFC] Introducing classes for the codegen driven by new pass manager



> On Jul 15, 2020, at 09:16, Robinson, Paul via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
>> I'd just note that not every pass you can run with "opt" is actually part of the optimization pipeline. There are a few important IR-level passes that only run in the codegen pipeline, but are still nameable with opt to run individually for testing purposes. Switching over doesn't need to block on these passes being migrated. So I'm not sure this method of determining progress towards switching to NPM actually makes sense.
>
> FTR, there are IR-level passes that only run in the codegen pipeline,
> and are *not* available in opt, but are available in llc; for example
> the stack protector pass.  Just throwing that out there.
> --paulr

I would consider these to be bugs. These passes tend to be poorly tested and don’t have nice single pass tests

-Matt
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