diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index 2b35c8e..c9c76e5 100644
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -195,6 +195,12 @@
   Builder.defineMacro(MacroName, llvm::Twine(TI.getTypeWidth(Ty)));
 }
 
+static void DefineTypeSizeof(llvm::StringRef MacroName, unsigned BitWidth,
+                             const TargetInfo &TI, MacroBuilder &Builder) {
+  Builder.defineMacro(MacroName,
+                      llvm::Twine(BitWidth / TI.getCharWidth()));
+}
+
 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 
                                const TargetInfo &TI, MacroBuilder &Builder) {
   int TypeWidth = TI.getTypeWidth(Ty);
@@ -293,6 +299,8 @@
 
   if (LangOpts.Exceptions)
     Builder.defineMacro("__EXCEPTIONS");
+  if (LangOpts.RTTI)
+    Builder.defineMacro("__GXX_RTTI");
   if (LangOpts.SjLjExceptions)
     Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__");
 
@@ -350,6 +358,23 @@
   DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder);
   DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder);
 
+  DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder);
+  DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_PTRDIFF_T__",
+                   TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_SIZE_T__",
+                   TI.getTypeWidth(TI.getSizeType()), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_WCHAR_T__",
+                   TI.getTypeWidth(TI.getWCharType()), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_WINT_T__",
+                   TI.getTypeWidth(TI.getWIntType()), TI, Builder);
+
   DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder);
   DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder);
   DefineTypeWidth("__INTMAX_WIDTH__",  TI.getIntMaxType(), TI, Builder);
@@ -364,6 +389,8 @@
   DefineType("__WINT_TYPE__", TI.getWIntType(), Builder);
   DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder);
   DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder);
+  DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder);
+  DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder);
 
   DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat());
   DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat());
diff --git a/test/Preprocessor/init.c b/test/Preprocessor/init.c
index b985098..28ead97 100644
--- a/test/Preprocessor/init.c
+++ b/test/Preprocessor/init.c
@@ -14,6 +14,7 @@
 // CXX0X:#define __DEPRECATED 1
 // CXX0X:#define __GNUG__
 // CXX0X:#define __GXX_EXPERIMENTAL_CXX0X__ 1
+// CXX0X:#define __GXX_RTTI 1
 // CXX0X:#define __GXX_WEAK__ 1
 // CXX0X:#define __cplusplus 199711L
 // CXX0X:#define __private_extern__ extern
@@ -23,6 +24,7 @@
 // 
 // CXX98:#define __DEPRECATED 1
 // CXX98:#define __GNUG__
+// CXX98:#define __GXX_RTTI 1
 // CXX98:#define __GXX_WEAK__ 1
 // CXX98:#define __cplusplus 199711L
 // CXX98:#define __private_extern__ extern
@@ -120,6 +122,8 @@
 // ARM:#define __APCS_32__ 1
 // ARM:#define __ARMEL__ 1
 // ARM:#define __ARM_ARCH_6J__ 1
+// ARM:#define __CHAR16_TYPE__ unsigned short
+// ARM:#define __CHAR32_TYPE__ unsigned int
 // ARM:#define __CHAR_BIT__ 8
 // ARM:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
 // ARM:#define __DBL_DIG__ 15
@@ -185,6 +189,18 @@
 // ARM:#define __SCHAR_MAX__ 127
 // ARM:#define __SHRT_MAX__ 32767
 // ARM:#define __SIG_ATOMIC_WIDTH__ 32
+// ARM:#define __SIZEOF_DOUBLE__ 8
+// ARM:#define __SIZEOF_FLOAT__ 4
+// ARM:#define __SIZEOF_INT__ 4
+// ARM:#define __SIZEOF_LONG_DOUBLE__ 8
+// ARM:#define __SIZEOF_LONG_LONG__ 8
+// ARM:#define __SIZEOF_LONG__ 4
+// ARM:#define __SIZEOF_POINTER__ 4
+// ARM:#define __SIZEOF_PTRDIFF_T__ 4
+// ARM:#define __SIZEOF_SHORT__ 2
+// ARM:#define __SIZEOF_SIZE_T__ 4
+// ARM:#define __SIZEOF_WCHAR_T__ 4
+// ARM:#define __SIZEOF_WINT_T__ 4
 // ARM:#define __SIZE_TYPE__ unsigned int
 // ARM:#define __SIZE_WIDTH__ 32
 // ARM:#define __THUMB_INTERWORK__ 1
@@ -205,6 +221,8 @@
 // BFIN:#define __ADSPLPBLACKFIN__ 1
 // BFIN:#define __BFIN 1
 // BFIN:#define __BFIN__ 1
+// BFIN:#define __CHAR16_TYPE__ unsigned short
+// BFIN:#define __CHAR32_TYPE__ unsigned int
 // BFIN:#define __CHAR_BIT__ 8
 // BFIN:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
 // BFIN:#define __DBL_DIG__ 15
@@ -268,6 +286,18 @@
 // BFIN:#define __SCHAR_MAX__ 127
 // BFIN:#define __SHRT_MAX__ 32767
 // BFIN:#define __SIG_ATOMIC_WIDTH__ 32
+// BFIN:#define __SIZEOF_DOUBLE__ 8
+// BFIN:#define __SIZEOF_FLOAT__ 4
+// BFIN:#define __SIZEOF_INT__ 4
+// BFIN:#define __SIZEOF_LONG_DOUBLE__ 8
+// BFIN:#define __SIZEOF_LONG_LONG__ 8
+// BFIN:#define __SIZEOF_LONG__ 4
+// BFIN:#define __SIZEOF_POINTER__ 4
+// BFIN:#define __SIZEOF_PTRDIFF_T__ 4
+// BFIN:#define __SIZEOF_SHORT__ 2
+// BFIN:#define __SIZEOF_SIZE_T__ 4
+// BFIN:#define __SIZEOF_WCHAR_T__ 4
+// BFIN:#define __SIZEOF_WINT_T__ 4
 // BFIN:#define __SIZE_TYPE__ long unsigned int
 // BFIN:#define __SIZE_WIDTH__ 32
 // BFIN:#define __UINTMAX_TYPE__ long long unsigned int
@@ -283,6 +313,8 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=i386-none-none < /dev/null | FileCheck -check-prefix I386 %s
 //
+// I386:#define __CHAR16_TYPE__ unsigned short
+// I386:#define __CHAR32_TYPE__ unsigned int
 // I386:#define __CHAR_BIT__ 8
 // I386:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
 // I386:#define __DBL_DIG__ 15
@@ -349,6 +381,18 @@
 // I386:#define __SCHAR_MAX__ 127
 // I386:#define __SHRT_MAX__ 32767
 // I386:#define __SIG_ATOMIC_WIDTH__ 32
+// I386:#define __SIZEOF_DOUBLE__ 8
+// I386:#define __SIZEOF_FLOAT__ 4
+// I386:#define __SIZEOF_INT__ 4
+// I386:#define __SIZEOF_LONG_DOUBLE__ 12
+// I386:#define __SIZEOF_LONG_LONG__ 8
+// I386:#define __SIZEOF_LONG__ 4
+// I386:#define __SIZEOF_POINTER__ 4
+// I386:#define __SIZEOF_PTRDIFF_T__ 4
+// I386:#define __SIZEOF_SHORT__ 2
+// I386:#define __SIZEOF_SIZE_T__ 4
+// I386:#define __SIZEOF_WCHAR_T__ 4
+// I386:#define __SIZEOF_WINT_T__ 4
 // I386:#define __SIZE_TYPE__ unsigned int
 // I386:#define __SIZE_WIDTH__ 32
 // I386:#define __UINTMAX_TYPE__ long long unsigned int
@@ -368,6 +412,8 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=msp430-none-none < /dev/null | FileCheck -check-prefix MSP430 %s
 //
 // MSP430:#define MSP430 1
+// MSP430:#define __CHAR16_TYPE__ unsigned short
+// MSP430:#define __CHAR32_TYPE__ unsigned int
 // MSP430:#define __CHAR_BIT__ 8
 // MSP430:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
 // MSP430:#define __DBL_DIG__ 15
@@ -431,6 +477,18 @@
 // MSP430:#define __SCHAR_MAX__ 127
 // MSP430:#define __SHRT_MAX__ 32767
 // MSP430:#define __SIG_ATOMIC_WIDTH__ 32
+// MSP430:#define __SIZEOF_DOUBLE__ 8
+// MSP430:#define __SIZEOF_FLOAT__ 4
+// MSP430:#define __SIZEOF_INT__ 2
+// MSP430:#define __SIZEOF_LONG_DOUBLE__ 8
+// MSP430:#define __SIZEOF_LONG_LONG__ 8
+// MSP430:#define __SIZEOF_LONG__ 4
+// MSP430:#define __SIZEOF_POINTER__ 2
+// MSP430:#define __SIZEOF_PTRDIFF_T__ 2
+// MSP430:#define __SIZEOF_SHORT__ 2
+// MSP430:#define __SIZEOF_SIZE_T__ 2
+// MSP430:#define __SIZEOF_WCHAR_T__ 2
+// MSP430:#define __SIZEOF_WINT_T__ 2
 // MSP430:#define __SIZE_TYPE__ unsigned int
 // MSP430:#define __SIZE_WIDTH__ 16
 // MSP430:#define __UINTMAX_TYPE__ long unsigned int
@@ -444,6 +502,8 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=pic16-none-none < /dev/null | FileCheck -check-prefix PIC16 %s
 //
+// PIC16:#define __CHAR16_TYPE__ unsigned short
+// PIC16:#define __CHAR32_TYPE__ unsigned int
 // PIC16:#define __CHAR_BIT__ 8
 // PIC16:#define __DBL_DENORM_MIN__ 1.40129846e-45F
 // PIC16:#define __DBL_DIG__ 6
@@ -507,6 +567,18 @@
 // PIC16:#define __SCHAR_MAX__ 127
 // PIC16:#define __SHRT_MAX__ 32767
 // PIC16:#define __SIG_ATOMIC_WIDTH__ 32
+// PIC16:#define __SIZEOF_DOUBLE__ 4
+// PIC16:#define __SIZEOF_FLOAT__ 4
+// PIC16:#define __SIZEOF_INT__ 2
+// PIC16:#define __SIZEOF_LONG_DOUBLE__ 4
+// PIC16:#define __SIZEOF_LONG_LONG__ 4
+// PIC16:#define __SIZEOF_LONG__ 4
+// PIC16:#define __SIZEOF_POINTER__ 2
+// PIC16:#define __SIZEOF_PTRDIFF_T__ 2
+// PIC16:#define __SIZEOF_SHORT__ 2
+// PIC16:#define __SIZEOF_SIZE_T__ 2
+// PIC16:#define __SIZEOF_WCHAR_T__ 2
+// PIC16:#define __SIZEOF_WINT_T__ 2
 // PIC16:#define __SIZE_TYPE__ unsigned int
 // PIC16:#define __SIZE_WIDTH__ 16
 // PIC16:#define __UINTMAX_TYPE__ long unsigned int
@@ -535,6 +607,8 @@
 // PPC64:#define _BIG_ENDIAN 1
 // PPC64:#define _LP64 1
 // PPC64:#define __BIG_ENDIAN__ 1
+// PPC64:#define __CHAR16_TYPE__ unsigned short
+// PPC64:#define __CHAR32_TYPE__ unsigned int
 // PPC64:#define __CHAR_BIT__ 8
 // PPC64:#define __CHAR_UNSIGNED__ 1
 // PPC64:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
@@ -604,6 +678,18 @@
 // PPC64:#define __SCHAR_MAX__ 127
 // PPC64:#define __SHRT_MAX__ 32767
 // PPC64:#define __SIG_ATOMIC_WIDTH__ 32
+// PPC64:#define __SIZEOF_DOUBLE__ 8
+// PPC64:#define __SIZEOF_FLOAT__ 4
+// PPC64:#define __SIZEOF_INT__ 4
+// PPC64:#define __SIZEOF_LONG_DOUBLE__ 8
+// PPC64:#define __SIZEOF_LONG_LONG__ 8
+// PPC64:#define __SIZEOF_LONG__ 8
+// PPC64:#define __SIZEOF_POINTER__ 8
+// PPC64:#define __SIZEOF_PTRDIFF_T__ 8
+// PPC64:#define __SIZEOF_SHORT__ 2
+// PPC64:#define __SIZEOF_SIZE_T__ 8
+// PPC64:#define __SIZEOF_WCHAR_T__ 4
+// PPC64:#define __SIZEOF_WINT_T__ 4
 // PPC64:#define __SIZE_TYPE__ long unsigned int
 // PPC64:#define __SIZE_WIDTH__ 64
 // PPC64:#define __UINTMAX_TYPE__ long unsigned int
@@ -621,6 +707,8 @@
 // PPC:#define _ARCH_PPC 1
 // PPC:#define _BIG_ENDIAN 1
 // PPC:#define __BIG_ENDIAN__ 1
+// PPC:#define __CHAR16_TYPE__ unsigned short
+// PPC:#define __CHAR32_TYPE__ unsigned int
 // PPC:#define __CHAR_BIT__ 8
 // PPC:#define __CHAR_UNSIGNED__ 1
 // PPC:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
@@ -689,6 +777,18 @@
 // PPC:#define __SCHAR_MAX__ 127
 // PPC:#define __SHRT_MAX__ 32767
 // PPC:#define __SIG_ATOMIC_WIDTH__ 32
+// PPC:#define __SIZEOF_DOUBLE__ 8
+// PPC:#define __SIZEOF_FLOAT__ 4
+// PPC:#define __SIZEOF_INT__ 4
+// PPC:#define __SIZEOF_LONG_DOUBLE__ 8
+// PPC:#define __SIZEOF_LONG_LONG__ 8
+// PPC:#define __SIZEOF_LONG__ 4
+// PPC:#define __SIZEOF_POINTER__ 4
+// PPC:#define __SIZEOF_PTRDIFF_T__ 4
+// PPC:#define __SIZEOF_SHORT__ 2
+// PPC:#define __SIZEOF_SIZE_T__ 4
+// PPC:#define __SIZEOF_WCHAR_T__ 4
+// PPC:#define __SIZEOF_WINT_T__ 4
 // PPC:#define __SIZE_TYPE__ long unsigned int
 // PPC:#define __SIZE_WIDTH__ 32
 // PPC:#define __UINTMAX_TYPE__ long long unsigned int
@@ -702,6 +802,8 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=s390x-none-none -fno-signed-char < /dev/null | FileCheck -check-prefix S390X %s
 //
+// S390X:#define __CHAR16_TYPE__ unsigned short
+// S390X:#define __CHAR32_TYPE__ unsigned int
 // S390X:#define __CHAR_BIT__ 8
 // S390X:#define __CHAR_UNSIGNED__ 1
 // S390X:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
@@ -766,6 +868,18 @@
 // S390X:#define __SCHAR_MAX__ 127
 // S390X:#define __SHRT_MAX__ 32767
 // S390X:#define __SIG_ATOMIC_WIDTH__ 32
+// S390X:#define __SIZEOF_DOUBLE__ 8
+// S390X:#define __SIZEOF_FLOAT__ 4
+// S390X:#define __SIZEOF_INT__ 4
+// S390X:#define __SIZEOF_LONG_DOUBLE__ 8
+// S390X:#define __SIZEOF_LONG_LONG__ 8
+// S390X:#define __SIZEOF_LONG__ 8
+// S390X:#define __SIZEOF_POINTER__ 8
+// S390X:#define __SIZEOF_PTRDIFF_T__ 8
+// S390X:#define __SIZEOF_SHORT__ 2
+// S390X:#define __SIZEOF_SIZE_T__ 8
+// S390X:#define __SIZEOF_WCHAR_T__ 4
+// S390X:#define __SIZEOF_WINT_T__ 4
 // S390X:#define __SIZE_TYPE__ long unsigned int
 // S390X:#define __SIZE_WIDTH__ 64
 // S390X:#define __UINTMAX_TYPE__ long long unsigned int
@@ -780,6 +894,8 @@
 //
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=sparc-none-none < /dev/null | FileCheck -check-prefix SPARC %s
 //
+// SPARC:#define __CHAR16_TYPE__ unsigned short
+// SPARC:#define __CHAR32_TYPE__ unsigned int
 // SPARC:#define __CHAR_BIT__ 8
 // SPARC:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
 // SPARC:#define __DBL_DIG__ 15
@@ -844,6 +960,18 @@
 // SPARC:#define __SCHAR_MAX__ 127
 // SPARC:#define __SHRT_MAX__ 32767
 // SPARC:#define __SIG_ATOMIC_WIDTH__ 32
+// SPARC:#define __SIZEOF_DOUBLE__ 8
+// SPARC:#define __SIZEOF_FLOAT__ 4
+// SPARC:#define __SIZEOF_INT__ 4
+// SPARC:#define __SIZEOF_LONG_DOUBLE__ 8
+// SPARC:#define __SIZEOF_LONG_LONG__ 8
+// SPARC:#define __SIZEOF_LONG__ 4
+// SPARC:#define __SIZEOF_POINTER__ 4
+// SPARC:#define __SIZEOF_PTRDIFF_T__ 4
+// SPARC:#define __SIZEOF_SHORT__ 2
+// SPARC:#define __SIZEOF_SIZE_T__ 4
+// SPARC:#define __SIZEOF_WCHAR_T__ 4
+// SPARC:#define __SIZEOF_WINT_T__ 4
 // SPARC:#define __SIZE_TYPE__ long unsigned int
 // SPARC:#define __SIZE_WIDTH__ 32
 // SPARC:#define __UINTMAX_TYPE__ long long unsigned int
@@ -861,6 +989,8 @@
 // 
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=tce-none-none < /dev/null | FileCheck -check-prefix TCE %s
 //
+// TCE:#define __CHAR16_TYPE__ unsigned short
+// TCE:#define __CHAR32_TYPE__ unsigned int
 // TCE:#define __CHAR_BIT__ 8
 // TCE:#define __DBL_DENORM_MIN__ 1.40129846e-45F
 // TCE:#define __DBL_DIG__ 6
@@ -922,6 +1052,18 @@
 // TCE:#define __SCHAR_MAX__ 127
 // TCE:#define __SHRT_MAX__ 32767
 // TCE:#define __SIG_ATOMIC_WIDTH__ 32
+// TCE:#define __SIZEOF_DOUBLE__ 4
+// TCE:#define __SIZEOF_FLOAT__ 4
+// TCE:#define __SIZEOF_INT__ 4
+// TCE:#define __SIZEOF_LONG_DOUBLE__ 4
+// TCE:#define __SIZEOF_LONG_LONG__ 4
+// TCE:#define __SIZEOF_LONG__ 4
+// TCE:#define __SIZEOF_POINTER__ 4
+// TCE:#define __SIZEOF_PTRDIFF_T__ 4
+// TCE:#define __SIZEOF_SHORT__ 2
+// TCE:#define __SIZEOF_SIZE_T__ 4
+// TCE:#define __SIZEOF_WCHAR_T__ 4
+// TCE:#define __SIZEOF_WINT_T__ 4
 // TCE:#define __SIZE_TYPE__ unsigned int
 // TCE:#define __SIZE_WIDTH__ 32
 // TCE:#define __TCE_V1__ 1
@@ -940,6 +1082,8 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=x86_64-none-none < /dev/null | FileCheck -check-prefix X86_64 %s
 //
 // X86_64:#define _LP64 1
+// X86_64:#define __CHAR16_TYPE__ unsigned short
+// X86_64:#define __CHAR32_TYPE__ unsigned int
 // X86_64:#define __CHAR_BIT__ 8
 // X86_64:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
 // X86_64:#define __DBL_DIG__ 15
@@ -1008,6 +1152,18 @@
 // X86_64:#define __SCHAR_MAX__ 127
 // X86_64:#define __SHRT_MAX__ 32767
 // X86_64:#define __SIG_ATOMIC_WIDTH__ 32
+// X86_64:#define __SIZEOF_DOUBLE__ 8
+// X86_64:#define __SIZEOF_FLOAT__ 4
+// X86_64:#define __SIZEOF_INT__ 4
+// X86_64:#define __SIZEOF_LONG_DOUBLE__ 16
+// X86_64:#define __SIZEOF_LONG_LONG__ 8
+// X86_64:#define __SIZEOF_LONG__ 8
+// X86_64:#define __SIZEOF_POINTER__ 8
+// X86_64:#define __SIZEOF_PTRDIFF_T__ 8
+// X86_64:#define __SIZEOF_SHORT__ 2
+// X86_64:#define __SIZEOF_SIZE_T__ 8
+// X86_64:#define __SIZEOF_WCHAR_T__ 4
+// X86_64:#define __SIZEOF_WINT_T__ 4
 // X86_64:#define __SIZE_TYPE__ long unsigned int
 // X86_64:#define __SIZE_WIDTH__ 64
 // X86_64:#define __SSE2_MATH__ 1
@@ -1032,3 +1188,7 @@
 // RUN: %clang_cc1 -x c++ -triple i686-pc-linux-gnu -E -dM < /dev/null | FileCheck -check-prefix GNUSOURCE %s
 // GNUSOURCE:#define _GNU_SOURCE 1
 // 
+// RUN: %clang_cc1 -x c++ -std=c++98 -fno-rtti -E -dM < /dev/null | FileCheck -check-prefix NORTTI %s
+// NORTTI: __GXX_ABI_VERSION
+// NORTTI-NOT:#define __GXX_RTTI
+// NORTTI: __STDC__