Split ConstantInteger into ConstantInteger32 and ConstantInteger64.

src/IceDefs.h

 //===- subzero/src/IceDefs.h - Common Subzero declaraions -------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares various useful types and classes that have
 // widespread use across Subzero.  Every Subzero source file is
 // expected to include IceDefs.h.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEDEFS_H
 #define SUBZERO_SRC_ICEDEFS_H
 
 #include <stdint.h> // TODO: <cstdint> with C++11
 
 #include <cassert>
 #include <cstdio>     // snprintf
 #include <functional> // std::less
+#include <limits>
 #include <list>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/SmallBitVector.h"
 #include "llvm/ADT/STLExtras.h"
@@ skipping 87 matching lines @@
     return End.getWallTime() - Start.getWallTime();
   }
   void printElapsedUs(GlobalContext *Ctx, const IceString &Tag) const;
 
 private:
   const llvm::TimeRecord Start;
   Timer(const Timer &) LLVM_DELETED_FUNCTION;
   Timer &operator=(const Timer &) LLVM_DELETED_FUNCTION;
 };
 
+template <typename T> bool WouldOverflowAdd(T X, T Y) {
+  return ((X > 0 && Y > 0 && (X > std::numeric_limits<T>::max() - Y)) ||
+          (X < 0 && Y < 0 && (X < std::numeric_limits<T>::min() - Y)));
+}
+
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H