Added LLVM copyright header (for lack of a better term).

[oota-llvm.git] / include / llvm / Instruction.h

diff --git a/include/llvm/Instruction.h b/include/llvm/Instruction.h
index 89c64098c3c279a800318b902b3ab4975e91b437..f23fe32ef359982d3e6ebb74421a3e3343fd7212 100644 (file)
--- a/include/llvm/Instruction.h
+++ b/include/llvm/Instruction.h
@@ -1,4 +1,11 @@
 //===-- llvm/Instruction.h - Instruction class definition -------*- 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.
+// 
+//===----------------------------------------------------------------------===//
 //
 // This file contains the declaration of the Instruction class, which is the
 // base class for all of the LLVM instructions.
@@ -9,6 +16,7 @@
 #define LLVM_INSTRUCTION_H
 
 #include "llvm/User.h"
+
 template<typename SC> struct ilist_traits;
 template<typename ValueSubClass, typename ItemParentClass, typename SymTabClass,
          typename SubClass> class SymbolTableListTraits;
@@ -29,9 +37,6 @@ protected:
   Instruction(const Type *Ty, unsigned iType, const std::string &Name = "",
               Instruction *InsertBefore = 0);
 public:
-  virtual ~Instruction() {
-    assert(Parent == 0 && "Instruction still embedded in basic block!");
-  }
 
   // Specialize setName to handle symbol table majik...
   virtual void setName(const std::string &name, SymbolTable *ST = 0);
@@ -55,7 +60,9 @@ public:
         Instruction *getPrev()       { return Prev; }
   const Instruction *getPrev() const { return Prev; }
 
-  virtual bool hasSideEffects() const { return false; }  // Memory & Call insts
+  /// mayWriteToMemory - Return true if this instruction may modify memory.
+  ///
+  virtual bool mayWriteToMemory() const { return false; }
 
   // ---------------------------------------------------------------------------
   /// Subclass classification... getOpcode() returns a member of 
@@ -74,6 +81,33 @@ public:
     return iType >= BinaryOpsBegin && iType < BinaryOpsEnd;
   }
 
+  /// isAssociative - Return true if the instruction is associative:
+  ///
+  ///   Associative operators satisfy:  x op (y op z) === (x op y) op z
+  ///
+  /// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when
+  /// not applied to floating point types.
+  ///
+  bool isAssociative() const { return isAssociative(getOpcode(), getType()); }
+  static bool isAssociative(unsigned op, const Type *Ty);
+
+  /// isCommutative - Return true if the instruction is commutative:
+  ///
+  ///   Commutative operators satisfy: (x op y) === (y op x)
+  ///
+  /// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
+  /// applied to any type.
+  ///
+  bool isCommutative() const { return isCommutative(getOpcode()); }
+  static bool isCommutative(unsigned op);
+
+  /// isTrappingInstruction - Return true if the instruction may trap.
+  ///
+  bool isTrapping() const {
+    return isTrapping(getOpcode()); 
+  }
+  static bool isTrapping(unsigned op);
+  
   virtual void print(std::ostream &OS) const;
 
   /// Methods for support type inquiry through isa, cast, and dyn_cast: