[llvm-dev] Mark code from source to IR

[Jonas Wagner via llvm-dev]

Hi,

I am looking at a way to mark part of a source code for an optimisation
> pass (or how to transfert information from source code to IR).
>

Does it have to be comments, or could you do something like this?

if (optimize_me(i%2)) {
  ...
}

You could look at how __builtin_expect is handled inside the compiler. In
lib/Transforms/Scalar/LowerExpectIntrinsic.cpp, branch weight metadata is
generated based on that function. You could probably adapt this to generate
the metadata that you need.

Best,
Jonas
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