Eigen package is optional (support for removed eigen)

CMakeLists.txt

@@ -8,8 +8,12 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
-find_package (Eigen3 3.3.7 REQUIRED NO_MODULE)
-message(STATUS "Found Eigen3 in: ${Eigen3_DIR}")
+find_package (Eigen3 3.3.7 QUIET NO_MODULE)
+
+if (Eigen3_FOUND)
+    message(STATUS "Found Eigen3: ${Eigen3_DIR}")
+    add_definitions(-DEIGEN_FOUND)
+endif()
 
 set(CMAKE_CXX_STANDARD 17 CACHE STRING "")
 

README.md

@@ -77,7 +77,7 @@ If you're a C++ developer and require low-level control, optimization, or integr
 * GNU Make (4.2.1)
 * LLVM (17.0.6) - [src](https://github.com/llvm/llvm-project/tree/release/17.x), [release](https://releases.llvm.org/download.html#17.0.6)
     * Support for latest LLVM versions would be added soon
-* Eigen library (3.3.7)
+* Eigen library (3.3.7) (Optional)
 * Python (3.6.7)
 * Other python requirements
     * For training the vocabulary are available in [seed_embeddings/OpenKE/requirements.txt](./seed_embeddings/OpenKE/requirements.txt), and

src/CMakeLists.txt

@@ -30,7 +30,9 @@ if(NOT LLVM_IR2VEC)
 
   add_library(objlib OBJECT ${libsrc})
   set_property(TARGET objlib PROPERTY POSITION_INDEPENDENT_CODE 1)
-  target_link_libraries (objlib Eigen3::Eigen)
+  if(Eigen3_FOUND)
+    target_link_libraries (objlib Eigen3::Eigen)
+  endif()
 
   add_library(${IR2VEC_LIB} SHARED $<TARGET_OBJECTS:objlib>)
   add_library(${IR2VEC_LIB_STATIC} STATIC $<TARGET_OBJECTS:objlib>)
@@ -71,7 +73,9 @@ else()
     intrinsics_gen
   )
 
-  target_link_libraries(LLVMIR2Vec PRIVATE Eigen3::Eigen)
+  if(Eigen3_FOUND)
+    target_link_libraries(LLVMIR2Vec PRIVATE Eigen3::Eigen)
+  endif()
   target_include_directories(LLVMIR2Vec PRIVATE ${LLVM_MAIN_INCLUDE_DIR})
   target_include_directories(LLVMIR2Vec PRIVATE .)
 

src/FlowAware.cpp

@@ -5,7 +5,11 @@
 // file in the top-level directory for more details.
 //
 #include "FlowAware.h"
+#ifdef EIGEN_FOUND
+#include "VectorSolverEigen.h"
+#else
 #include "VectorSolver.h"
+#endif
 
 #include "llvm/ADT/DepthFirstIterator.h"
 #include "llvm/ADT/MapVector.h"

src/include/VectorSolverEigen.h

@@ -0,0 +1,63 @@
+// Copyright (c) 2021, S. VenkataKeerthy, Rohit Aggarwal
+// Department of Computer Science and Engineering, IIT Hyderabad
+//
+// This software is available under the BSD 4-Clause License. Please see LICENSE
+// file in the top-level directory for more details.
+//
+#ifndef __VECTOR_SOLVER_H__
+#define __VECTOR_SOLVER_H__
+#define EIGEN_MPL2_ONLY
+
+#include "Eigen/LU"
+#include "Eigen/QR"
+#include "llvm/ADT/SmallVector.h"
+#include <vector>
+
+using namespace Eigen;
+using namespace llvm;
+
+typedef std::vector<std::vector<double>> matrix;
+
+MatrixXd calculate(MatrixXd A, MatrixXd B) {
+  if (A.determinant() != 0) {
+    return A.fullPivHouseholderQr().solve(B);
+  } else {
+    // To-Do: perturb probabilities
+    llvm_unreachable("inconsistent/infinitely many solutions");
+  }
+}
+
+MatrixXd formMatrix(std::vector<std::vector<double>> a, int r, int l) {
+  MatrixXd M(r, l);
+  for (int i = 0; i < r; i++)
+    M.row(i) = VectorXd::Map(&a[i][0], a[i].size());
+
+  return M;
+}
+
+matrix solve(matrix A, matrix B) {
+  int r = A.size();
+  int c = A[0].size();
+  MatrixXd mA(r, c);
+  mA = formMatrix(A, r, c);
+
+  r = B.size();
+  c = B[0].size();
+  MatrixXd mB(r, c);
+  mB = formMatrix(B, r, c);
+
+  r = A.size();
+  MatrixXd x(r, c);
+  x = calculate(mA, mB);
+  std::vector<std::vector<double>> raw_data;
+  // raw_data.resize(x.rows());
+  for (unsigned i = 0; i < x.rows(); i++) {
+    std::vector<double> tmp;
+    tmp.resize(x.cols());
+    VectorXd::Map(&tmp[0], x.cols()) = x.row(i);
+    raw_data.push_back(tmp);
+  }
+  return raw_data;
+}
+
+#endif