Subzero: Initial implementation of BB Local CSE

src/IceOperand.h

Index: src/IceOperand.h
diff --git a/src/IceOperand.h b/src/IceOperand.h
index b3e0f5f027a8a80c8a84f094d4a2d20f4b98d3df..fdb2a66c8a415b52ae78ae5a045692825a7ca799 100644
--- a/src/IceOperand.h
+++ b/src/IceOperand.h
@@ -98,6 +98,12 @@ public:
 
   virtual Variable *asBoolean() { return nullptr; }
 
+  virtual SizeT hashValue() const {
+    llvm::report_fatal_error("Tried to hash unsupported operand type : " +
+                             std::to_string(Kind));
+    return 0;
+  }
+
 protected:
   Operand(OperandKind Kind, Type Ty) : Ty(Ty), Kind(Kind) {
     // It is undefined behavior to have a larger value in the enum
@@ -153,6 +159,7 @@ public:
     ++LookupCount;
   }
   CounterType getLookupCount() const { return LookupCount; }
+  SizeT hashValue() const override { return 0; }
 
 protected:
   Constant(OperandKind Kind, Type Ty) : Operand(Kind, Ty) {
@@ -204,6 +211,10 @@ public:
     return Operand->getKind() == K;
   }
 
+  SizeT hashValue() const override {
+    return std::hash<PrimType>()(Value);
+  }
+
   virtual bool shouldBeRandomizedOrPooled() const override { return false; }
 
 private:
@@ -769,6 +780,10 @@ public:
     return Kind >= kVariable && Kind <= kVariable_Max;
   }
 
+  SizeT hashValue() const override {
+    return std::hash<SizeT>()(getIndex());
+  }
+
 protected:
   Variable(const Cfg *Func, OperandKind K, Type Ty, SizeT Index)
       : Operand(K, Ty), Number(Index),