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On Thu, Mar 6, 2014 at 2:44 PM, Tobias Grosser <tobias at grosser.es> wrote: as others already pointed out, I committed the first piece of such an > infrastructure in LLVM commit 202474 and clang commit 202475. This is > mostly the backend and printing infrastructure. > Thanks, Tobias. I've browsed the two patches and I think they're going to be exactly what I need. IIUC, the patches add two new LLVM instructions remark and note. These are inserted in the IL by th...

The context of this is performance analysis of generated code. My interest is to trace at a high-level the major decisions done by the various optimizers. For instance, when the inliner decides to inline foo into bar, or the loop unroller decides to unroll a loop N times, or the vectorizer decides to vectorize a loop body. Many of these details are usually available via -debug-only. However, this