LLVM

• Retargeting

  1. Tutorial : Building a backend in 24 hours (2009)
  2. Tutorial : Building a backend in 24 hours (2012)
  3. CodeGen Overview and Focus on SelectionDAGs
  4. Design and Implementation of a TriCore Backend for the LLVM Compiler Framework

• Resources

  1. LLVM Developers' Meeting

• Useful Post in llvm-dev list

  1. [LLVMdev] Understanding SelectionDAG construction
  2. [LLVMdev] Data layout and Optimization
  3. [LLVMdev] CodeGen instructions and patterns
  4. [LLVMdev] Pattern matching in a SelectionDAG
  5. [LLVMdev] Conceptual difference between "Unallocatable" and "Reserved" registers.
  6. [LLVMdev] The meaning of SDNPHasChain

• Libraries.

  1. STLPort: A port of the original STL to many platforms. Derived from the SGI implementation.

• Memo

  1. llvm/lib/Target/ISDOpcodes.h. The target-independent operators for a SelectionDAG are defined here.
  2. llvm/include/llvm/CodeGen/SelectionDAGNodes.h. SDNode class and derived classes are defined here.
  3. TokenFactor Node This node takes multiple tokens as input and produces a single token result. This is used to represent the fact that the operand operators are independent of each other.