Dependence analyzer that just determines dependences within a loop for loads and stores using alias analysis.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20930 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 73 insertions, 0 deletions

diff --git a/lib/Target/SparcV9/ModuloScheduling/DependenceAnalyzer.h b/lib/Target/SparcV9/ModuloScheduling/DependenceAnalyzer.h
new file mode 100644
index 0000000000..18f64203f4
--- /dev/null
+++ b/lib/Target/SparcV9/ModuloScheduling/DependenceAnalyzer.h
@@ -0,0 +1,73 @@
+//===-- DependenceAnalyzer.h - Dependence Analyzer--------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// 
+// 
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEPENDENCEANALYZER_H
+#define LLVM_DEPENDENCEANALYZER_H
+
+#include "llvm/Instructions.h"
+#include "llvm/Function.h"
+#include "llvm/Pass.h"
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Target/TargetData.h"
+#include <vector>
+
+namespace llvm {
+
+  //class to represent a dependence
+  struct Dependence {
+    
+    enum DataDepType {
+      TrueDep, AntiDep, OutputDep, NonDateDep,
+    };
+    
+    Dependence(int diff, DataDepType dep) : iteDiff(diff), depType(dep) {}
+    unsigned getIteDiff() { return iteDiff; }
+    unsigned getDepType() { return depType; }
+    
+    private:
+    
+    unsigned iteDiff;
+    unsigned depType;
+  };
+
+  
+  struct DependenceResult {
+    std::vector<Dependence> dependences;
+    DependenceResult(const std::vector<Dependence> &d) : dependences(d) {}
+  };
+
+
+  class DependenceAnalyzer : public FunctionPass {
+    AliasAnalysis *AA;
+    TargetData *TD;
+ 
+  public:
+    DependenceAnalyzer() { AA = 0; TD = 0; }
+    virtual bool runOnFunction(Function &F);
+    virtual const char* getPassName() const { return "DependenceAnalyzer"; }
+  
+    // getAnalysisUsage
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.addRequired<AliasAnalysis>();
+      AU.addRequired<TargetData>();
+    }
+
+    //get dependence info
+    DependenceResult getDependenceInfo(Instruction *inst1, Instruction *inst2);
+
+  };
+
+}
+
+
+
+#endif