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Hi, Several weeks ago a prototyped a feature similar to what you're describing. I was experimenting to see how one might implement a feature like ICC's -vec–report feature in clang/llvm. My approach was to create an ImmutablePass which stores notes. I modified the loop vectorizer and the unroll pass to add notes when loops were vectorized or unrolled. On the clang side I add an OptReport

Hi, I would like to start a discussion about error/warning reporting in LLVM and how we can extend the current mechanism to take advantage of clang capabilities. ** Motivation ** Currently LLVM provides a way to report error either directly (print to stderr) or by using a user defined error handler. For instance, in inline asm parsing, we can specify the diagnostic handler to report the errors