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

[Matt Arsenault via llvm-dev]

> On Jul 15, 2020, at 12:28, Chen, Yuanfang <Yuanfang.Chen at sony.com> wrote:
> 
> 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.
> 


I think there’s no real distinction between “codegen” IR passes and noncodegen IR passes. I routinely run “codegen only” passes with opt in conjunction with other passes when experimenting. I think losing the ability to run any IR pass with opt would be a functionality regression.

-Matt