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...ng experience of disabling specific passes. In my mind, -Og probably would incorporate a few things: * Tweak certain pass behaviors in order to be more favorable towards debugging [ https://reviews.llvm.org/D59431#1437716 ] * Enable features favorable to debugging [ http://llvm.org/devmtg/2017-10/#lightning8 ] * Disable whole passes that are known to fundamentally harm the debugging experience if there is no other alternative approach (this proposal?) * Still give a decent debug experience when used in conjunction with LTO. Thanks again for writing up your proposal. I'm really happy to see moveme...

Hi All, I’ve been thinking about both O1 and Og optimization levels and have a proposal for an improved O1 that I think overlaps in functionality with our desires for Og. The design goal is to rewrite the O1 optimization and code generation pipeline to include the set of optimizations that minimizes build and test time while retaining our ability to debug. This isn’t to minimize efforts around