[PATCH] D104060: Machine IR Profile

[Ellis Hoag via Phabricator via llvm-commits]

ellis added a comment.

In D104060#2811754 <https://reviews.llvm.org/D104060#2811754>, @davidxl wrote:

> Very interesting work.  A high level question, the CSFDO/CSPGO instruments the program after the inlining pass, so it can provide the same level of coverage for machine IR. What additional information do we expect from MIR profile that is not available in CSFDO?

One of the main features of MIP is that the instrumented binaries do not contain any excess metadata so they are very small. In fact, all the metadata is extracted out into a `.mipmap` file. Later diffs (https://github.com/ellishg/llvm-project) add more profile data including function call counts, function call order, and samples of the return address register which we can use to generate a dynamic call graph that includes dynamic dispatch calls.


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