assert(MO.getReg().isVirtual() && "Can only allocate a virtual register");
    

    auto const allocUse = [this](MachineOperand &MO){ this->allocateOperand(MO, true); };
    auto const allocDef = [this](MachineOperand &MO){ this->allocateOperand(MO, false); };

    auto const allocUse = [this](MachineOperand &MO){ 
      assert(MO.isUse());
      LLVM_DEBUG(dbgs() << "Regalloc: Allocating use " << MO << "\n");
      this->allocateOperand(MO, true); 
    };
    auto const allocDef = [this](MachineOperand &MO){ 
      assert(MO.isDef());
      LLVM_DEBUG(dbgs() << "Regalloc: Allocating def " << MO << "\n");
      this->allocateOperand(MO, false); 
    };

          LLVM_DEBUG(dbgs() << "Regalloc: Spilling clobbered reg " << R << "\n");

    assert(MO.getReg().isVirtual() && "Cannot bind a physical register to a non-virtual register");

set(LLVM_ALL_PROJECTS "bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;libcxx;libcxxabi;libunwind;lld;lldb;mlir;openmp;polly;pstl")
# The flang project is not yet part of "all" projects (see C++ requirements)
set(LLVM_EXTRA_PROJECTS "flang")

##
## Removed projects not vendored
##
set(LLVM_ALL_PROJECTS "clang")

This is a monorepo of my compiler projects that use LLVM. It is primarily intended to be built with Bazel, but CMake is also supported.
`coollang/` contains the frontend and runtime for COOL (Classroom Object-Oriented Language), which is a small language that still supports static typing, garbage collection, polymorphism, and dynamic dispatch.
`clang/` is the unmodified clang 15.0.7 source tree
`llvm/` is the unmodified llvm 15.0.7 source tree with the addition of optimizations I developed:
- `llvm/lib/CodeGen/RegAllocSimple.cpp` is a bottom-up local register allocator
- `llvm/lib/Analysis/UnitLoopInfo.cpp` is a natural-loop detector
- `llvm/lib/Transforms/Scalar/UnitLICM.cpp` is a loop-invariant code motion pass
- `llvm/lib/Transforms/Scalar/UnitSCCP.cpp` is a sparse conditional-constant propagation pass
Corresponding headers and tests can be found in the usual places

build --fission=yes

#build --fission=yes