Adding barebones pass for inserting ApproxInfo - incomplete

llvm/lib/Transforms/CMakeLists.txt

@@ -16,6 +16,7 @@ add_subdirectory(DFG2LLVM_SPIR)
 add_subdirectory(DFG2LLVM_X86)
 add_subdirectory(LocalMem)
 add_subdirectory(InPlaceDFG)
+add_subdirectory(InsertApproxInfo)
 add_subdirectory(GenVISC)
 add_subdirectory(MergeDFN)
 add_subdirectory(FuseHPVMTensorNodes)

llvm/lib/Transforms/InsertApproxInfo/CMakeLists.txt

+if(WIN32 OR CYGWIN)
+  set(LLVM_LINK_COMPONENTS Core Support)
+endif()
+
+add_llvm_loadable_module( InsertApproxInfo
+  InsertApproxInfo.cpp
+
+  DEPENDS
+  intrinsics_gen
+  PLUGIN_TOOL
+  opt
+  )

llvm/lib/Transforms/InsertApproxInfo/InsertApproxInfo.cpp

+//===------------------------ InPlaceDFGAnalysis.cpp ----------------------===//
+//
+//
+//
+//                     The LLVM Compiler Infrastructure
+//
+//
+//
+// This file is distributed under the University of Illinois Open Source
+//
+// License. See LICENSE.TXT for details.
+//
+//
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "InsertApproxInfo"
+
+#include "llvm/IR/Module.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/InPlaceDFG/InPlaceDFGAnalysis.h"
+#include "llvm/SupportVISC/DFG2LLVM.h"
+
+
+using namespace llvm;
+using namespace builddfg;
+using namespace dfg2llvm;
+using namespace inplacedfg;
+
+
+namespace {
+
+struct InsertApproxInfoWrapperPass : public ModulePass {
+  static char ID; // Pass identification, replacement for typeid
+  InsertApproxInfoWrapperPass() : ModulePass(ID) {}
+  
+public:
+  // Functions
+  bool runOnModule(Module &M);
+  void getAnalysisUsage(AnalysisUsage &AU) const;
+};
+
+
+// Visitor for Code generation traversal (tree traversal for now)
+class InsertApproxInfo : public CodeGenTraversal {
+
+private:
+  // Virtual Functions
+  void init() {}
+  void initRuntimeAPI() {}
+  void codeGen(DFInternalNode* N);
+  void codeGen(DFLeafNode* N);
+
+public:
+  // Constructor
+  InsertApproxInfo(Module &_M, BuildDFG &_DFG) :
+    CodeGenTraversal(_M, _DFG){
+  }
+
+  //void run(Module &M, BuildDFG &DFG);
+  void run();
+
+};
+
+
+
+void InsertApproxInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<BuildDFG>();
+  AU.addPreserved<BuildDFG>();
+}
+
+bool InsertApproxInfoWrapperPass::runOnModule(Module &M) {
+  
+  // Get the BuildDFG Analysis Results:
+  // - Dataflow graph
+  BuildDFG &DFG = getAnalysis<BuildDFG>();
+
+  InsertApproxInfo IApprox(M, DFG);
+  IApprox.run();
+
+  return false;
+}
+
+/*** Methods of InPlaceDFGAnalysis ***/
+void InsertApproxInfo::run() {
+
+  errs() << "\n NOTE: ApproxInfo INSERTION TRANSFORM \n";
+  std::vector<DFInternalNode*> Roots = DFG.getRoots();
+
+  // Iterate over all the DFGs
+  // Analyse the edges for parameters that are valid to be used in place
+  for (auto rootNode: Roots) {
+    //ATVisitor->visit(rootNode);
+   this->visit(rootNode);
+  }
+
+  //delete ATVisitor;
+  return;
+}
+
+/*** Analysis of internal node ***/
+void InsertApproxInfo::codeGen(DFInternalNode* N) {
+  DEBUG(errs() << "Analysing Node: " << N->getFuncPointer()->getName() << "\n");
+}
+
+/*** Analysis of leaf node ***/
+void InsertApproxInfo::codeGen(DFLeafNode* N) {
+  DEBUG(errs() << "Analysing Node: " << N->getFuncPointer()->getName() << "\n");
+
+}
+
+char InsertApproxInfoWrapperPass::ID = 0;
+static RegisterPass<InsertApproxInfoWrapperPass> X("insert-approxinfo",
+  "Pass to add approximation information (l-norm metrics) in the ApproxHPVM DFG",
+  false /* does not modify the CFG */,
+  false /* not transformation, just analysis */);
+
+} // End of namespace
+

llvm/lib/Transforms/InsertApproxInfo/LLVMBuild.txt

+;===- ./lib/Transforms/LocalMem/LLVMBuild.txt ------------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = InsertApproxInfo
+parent = Transforms