LLVM研习

Table of Contents 1. Prepare LLVM project. 2. Make your pass 3. Compile your pass 4. Test it with op

Some notes about tablegen and its data structures with some explaination.

The LLVM Tablegen target description for RISCV ADD instruction and its variants.

The tablegen pattern syntax and tablegen related notes.

LLVM basic steps for writing an llvm backend and its initializations for backend componenets.

During the DAG-based Instruction Selection in LLVM, each IR instruction will be turned into a DAG no

This is a new series of posts for craft an LLVM Backend for LCC architecture for tutorial purpose. (

We know that for the DAG-based instruction selector in LLVM, we specifies the pattern in a target-sp

InLLVMDocument,wecanseethereare8stepsforDAG-basedInstructionSelections.Moreoverinitssourcecode,i.e.v

ThereisanexcellentarticleexplainingthebackendstructureofLLVM,i.e. Tutorial:CreatinganLLVMBackendfort

AssumingthetargetneededtoregisteriscalledNT,i.e.NewTarget.1.Createatargetdirectoryunderllvm/lib/Targ

A DataLayout string is used to determine the datat layout of a target machine.

InWritinganLLVMPass,wecanknowalotaboutthePassesandPassManagersinLLVM.Thereforethefollowingcontentisb

ThispostistoseehowthevisualizeSelectionDAGlookslike.Thereforeweuseasimpleaddfunctioninctodepictthisp

Inmypreviouspostaboutvisitorpattern,C++:VisitorPatternDynamicvs.Static,ImentionedtheStaticVisitorpat