What is LVM?

Question

C++ / C#

Please explain what is LLVM ?, and how it works / works.
Wiki and related posts did not help, all these backends, frontends optimizers only confuse the explanation.
I would also like such a "diagram"
source code -> code state A (what happened) -> B (what happened) -> ... -> processor instructions.

Answer 1

Source code -> parser (frontend) -> IR code generator (we got an intermediate virtual machine bytecode) -> LLVM backend (from IR code we generate code for the target platform (llc) or we can directly execute it (lli) )
this is a "layer" between the source code and machine code for a specific platform.
What is it for? To generate better (optimized) code.

Answer 2

>backends, frontends optimizers only confuse explanations
And how can you explain without this, if these are the basic concepts?
Here you can read www.aosabook.org/en/llvm.html with diagrams and examples.