Add new classes for working with optional optimization data

for binary operators Add, Sub, Mul, and UDiv.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76217 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/BinaryOperators.h

@@ -0,0 +1,112 @@
+//===-- llvm/BinaryOperators.h - BinaryOperator subclasses ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines various classes for working with specific BinaryOperators,
+// exposing special properties that individual operations have.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BINARY_OPTERATORS_H
+#define LLVM_BINARY_OPTERATORS_H
+
+#include "llvm/InstrTypes.h"
+
+namespace llvm {
+
+//===----------------------------------------------------------------------===//
+//                      SpecificBinaryOperator Class
+//===----------------------------------------------------------------------===//
+
+/// SpecificBinaryOperator - This is a base class for utility classes that
+/// provide additional information about binary operator instructions with
+/// specific opcodes.
+///
+class SpecificBinaryOperator : public BinaryOperator {
+private:
+  // Do not implement any of these. The SpecificBinaryOperator class is
+  // intended to be used as a utility, and is never itself instantiated.
+  void *operator new(size_t, unsigned);
+  void *operator new(size_t s);
+  void Create(BinaryOps Op, Value *S1, Value *S2,
+              const std::string &Name = "",
+              Instruction *InsertBefore = 0);
+  void Create(BinaryOps Op, Value *S1, Value *S2,
+              const std::string &Name,
+              BasicBlock *InsertAtEnd);
+  SpecificBinaryOperator();
+  ~SpecificBinaryOperator();
+  void init(BinaryOps iType);
+};
+
+/// OverflowingBinaryOperator - Base class for integer arithmetic operators
+/// which may exhibit overflow - Add, Sub, and Mul.
+///
+class OverflowingBinaryOperator : public SpecificBinaryOperator {
+public:
+  /// hasNoSignedOverflow - Test whether this operation is known to never
+  /// undergo signed overflow.
+  bool hasNoSignedOverflow() const {
+    return SubclassOptionalData & (1 << 0);
+  }
+  void setHasNoSignedOverflow(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+  }
+
+  /// hasNoUnsignedOverflow - Test whether this operation is known to never
+  /// undergo unsigned overflow.
+  bool hasNoUnsignedOverflow() const {
+    return SubclassOptionalData & (1 << 1);
+  }
+  void setHasNoUnsignedOverflow(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~(1 << 1)) | (B << 1);
+  }
+
+  static inline bool classof(const OverflowingBinaryOperator *) { return true; }
+  static inline bool classof(const BinaryOperator *BO) {
+    return BO->getOpcode() == Instruction::Add ||
+           BO->getOpcode() == Instruction::Sub ||
+           BO->getOpcode() == Instruction::Mul;
+  }
+  static inline bool classof(const Instruction *I) {
+    return I->isBinaryOp() && classof(cast<BinaryOperator>(I));
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+};
+
+/// UDivInst - BinaryOperators with opcode Instruction::UDiv.
+///
+class UDivInst : public SpecificBinaryOperator {
+public:
+  /// isExact - Test whether this division is known to be exact, with
+  /// zero remainder.
+  bool isExact() const {
+    return SubclassOptionalData & (1 << 0);
+  }
+  void setIsExact(bool B) {
+    SubclassOptionalData = (SubclassOptionalData & ~(1 << 0)) | (B << 0);
+  }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const UDivInst *) { return true; }
+  static inline bool classof(const BinaryOperator *BO) {
+    return BO->getOpcode() == Instruction::UDiv;
+  }
+  static inline bool classof(const Instruction *I) {
+    return I->isBinaryOp() && classof(cast<BinaryOperator>(I));
+  }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) && classof(cast<Instruction>(V));
+  }
+};
+
+} // End llvm namespace
+
+#endif