diff --git a/lib/Basic/TargetInfo.cpp b/lib/Basic/TargetInfo.cpp
index a513cb1..ba7f190 100644
--- a/lib/Basic/TargetInfo.cpp
+++ b/lib/Basic/TargetInfo.cpp
@@ -41,6 +41,7 @@
   UIntMaxType = UnsignedLongLong;
   IntPtrType = SignedLong;
   WCharType = SignedInt;
+  Int64Type = SignedLongLong;
   FloatFormat = &llvm::APFloat::IEEEsingle;
   DoubleFormat = &llvm::APFloat::IEEEdouble;
   LongDoubleFormat = &llvm::APFloat::IEEEdouble;
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 286b2e1..88dd6f7 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -549,6 +549,9 @@
 public:
   PPC64TargetInfo(const std::string& triple) : PPCTargetInfo(triple) {
     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
+    IntMaxType = SignedLong;
+    UIntMaxType = UnsignedLong;
+    Int64Type = SignedLong;
     DescriptionString = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
                         "i64:64:64-f32:32:32-f64:64:64-v128:128:128";
   }
@@ -940,11 +943,11 @@
 public:
   X86_64TargetInfo(const std::string &triple) : X86TargetInfo(triple) {
     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
-    DoubleAlign = LongLongAlign = 64;
     LongDoubleWidth = 128;
     LongDoubleAlign = 128;
     IntMaxType = SignedLong;
     UIntMaxType = UnsignedLong;
+    Int64Type = SignedLong;
     RegParmMax = 6;
 
     DescriptionString = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
@@ -963,6 +966,16 @@
 } // end anonymous namespace
 
 namespace {
+class DarwinX86_64TargetInfo : public DarwinTargetInfo<X86_64TargetInfo> {
+public:
+  DarwinX86_64TargetInfo(const std::string& triple) 
+      : DarwinTargetInfo<X86_64TargetInfo>(triple) {
+    Int64Type = SignedLongLong;
+  }
+};
+} // end anonymous namespace
+
+namespace {
 class ARMTargetInfo : public TargetInfo {
   enum {
     Armv4t,
@@ -1363,7 +1376,7 @@
 
   if (T.find("x86_64-") == 0 || T.find("amd64-") == 0) {
     if (isDarwin)
-      return new DarwinTargetInfo<X86_64TargetInfo>(T);
+      return new DarwinX86_64TargetInfo(T);
     if (isLinux)
       return new LinuxTargetInfo<X86_64TargetInfo>(T);
     if (isOpenBSD)
diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index 05f9607..e41dfdd 100644
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -383,7 +383,7 @@
   
   // 16-bit targets doesn't necessarily have a 64-bit type.
   if (TI.getLongLongWidth() == 64)
-    DefineBuiltinMacro(Buf, "__INT64_TYPE__=long long");
+    DefineType("__INT64_TYPE__", TI.getInt64Type(), Buf);
   
   // Add __builtin_va_list typedef.
   {