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Mar 9, 2016 at 09:14

What is the difference between O0, O1, O2, O3, Os and Oz? When should you USSR each? A spec just landed in LLVM:

[PM] Wire up optimization levels and default pipeline construction APIs · llvm/llvm-project@8b5a741

[PM] Wire up optimization levels and default pipeline construction APIs · llvm/llvm-project@8b5a741

in the PassBuilder. These are really just stubs for now, but they give a nice API surface that Clang or other tools can start learning about and enabling for experimentation. I've also wired ...