LLVM

• is a collection of modular and reusable compiler and toolchain technologies
• has little to do with traditional virtual machines

LLVM - Compilation Stages

In the LLVM the compilation takes three stages

The stages are:

• The frontend, parsing the original language and spits out IR code
• The optimizer, mangling one IR into optimized equivalent IR. This stage does all the usual optimizations like constant propagation, dead code removal, and so on
• The backend, taking IR and producing machine code optimized for a specific CPU

LLVM - Intermediate Representation (IR)

see LLVM Intermediate Representation (IR)

LLVM - Frontend Compilers

• LLVM Frontend - Creating Own Custom
• clang

LLVM - Middle-end Compiler

TODO

LLVM - Backend Compiler

The backend supports compiling IR into many different Instruction Set Architectures