Three libs?

[WhiteBlackGoose]

Codegen

That one is just the core. It has the CodegenInfo object, and everything to get it.

var ci =  CodegenInfoResolver.GetCodegen(() => Add(4, 5));
Console.WriteLine(ci);

Codegen.Assertions

That one is a test suite: it has multiple assertions to verify the behaviour of JIT.

AssertCodegen.BranchesLessThan(5, () => Add(3, 5));

Codegen.Benchmarks

This one will build a report based on a codegen.

CodegenBenchmarkRunner.Run<Bench>();

class Bench
{
    [Benchmark]
    [Input(3, 5)]
    public void Add(int a, int b) => a + b;

    [Benchmark]
    [Input(3, 5, 6)]
    public void Add(int a, int b, int c) => a + b + c;
}

Output:

Method	Code size	Branches	Calls	Stack allocated memory	Backward jumps (loops)
SomeMethod	43 B	3	-	-	2
OtherMethod	164 B	7	11	164 B	-

(and prints the codegen)

[WhiteBlackGoose]

Done!