Index: lib/Basic/CMakeLists.txt
===================================================================
--- lib/Basic/CMakeLists.txt
+++ lib/Basic/CMakeLists.txt
@@ -83,6 +83,7 @@
   Targets/OSTargets.cpp
   Targets/PNaCl.cpp
   Targets/PPC.cpp
+  Targets/RISCV.cpp
   Targets/SPIR.cpp
   Targets/Sparc.cpp
   Targets/SystemZ.cpp
Index: lib/Basic/Targets.cpp
===================================================================
--- lib/Basic/Targets.cpp
+++ lib/Basic/Targets.cpp
@@ -29,6 +29,7 @@
 #include "Targets/OSTargets.h"
 #include "Targets/PNaCl.h"
 #include "Targets/PPC.h"
+#include "Targets/RISCV.h"
 #include "Targets/SPIR.h"
 #include "Targets/Sparc.h"
 #include "Targets/SystemZ.h"
@@ -370,6 +371,11 @@
   case llvm::Triple::r600:
     return new AMDGPUTargetInfo(Triple, Opts);
 
+  case llvm::Triple::riscv32:
+    return new RISCV32TargetInfo(Triple, Opts);
+  case llvm::Triple::riscv64:
+    return new RISCV64TargetInfo(Triple, Opts);
+
   case llvm::Triple::sparc:
     switch (os) {
     case llvm::Triple::Linux:
Index: lib/Basic/Targets/RISCV.h
===================================================================
--- /dev/null
+++ lib/Basic/Targets/RISCV.h
@@ -0,0 +1,103 @@
+//===--- RISCV.h - Declare RISCV target feature support ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares RISCV TargetInfo objects.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H
+#define LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H
+
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/TargetOptions.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/Compiler.h"
+
+namespace clang {
+namespace targets {
+
+// RISC-V Target
+class RISCVTargetInfo : public TargetInfo {
+protected:
+  std::string ABI;
+
+public:
+  RISCVTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
+      : TargetInfo(Triple) {
+    TLSSupported = false;
+    LongDoubleWidth = 128;
+    LongDoubleAlign = 128;
+    LongDoubleFormat = &llvm::APFloat::IEEEquad();
+    SuitableAlign = 128;
+    WCharType = SignedInt;
+    WIntType = UnsignedInt;
+  }
+
+  StringRef getABI() const override { return ABI; }
+  void getTargetDefines(const LangOptions &Opts,
+                        MacroBuilder &Builder) const override;
+
+  ArrayRef<Builtin::Info> getTargetBuiltins() const override { return None; }
+
+  BuiltinVaListKind getBuiltinVaListKind() const override {
+    return TargetInfo::VoidPtrBuiltinVaList;
+  }
+
+  const char *getClobbers() const override { return ""; }
+
+  ArrayRef<const char *> getGCCRegNames() const override;
+
+  ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override;
+
+  bool validateAsmConstraint(const char *&Name,
+                             TargetInfo::ConstraintInfo &Info) const override {
+    return false;
+  }
+};
+class LLVM_LIBRARY_VISIBILITY RISCV32TargetInfo : public RISCVTargetInfo {
+public:
+  RISCV32TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : RISCVTargetInfo(Triple, Opts) {
+    IntPtrType = SignedInt;
+    PtrDiffType = SignedInt;
+    SizeType = UnsignedInt;
+    resetDataLayout("e-m:e-p:32:32-i64:64-n32-S128");
+  }
+
+  bool setABI(const std::string &Name) override {
+    // TODO: support ilp32f and ilp32d ABIs.
+    if (Name == "ilp32") {
+      ABI = Name;
+      return true;
+    }
+    return false;
+  }
+};
+class LLVM_LIBRARY_VISIBILITY RISCV64TargetInfo : public RISCVTargetInfo {
+public:
+  RISCV64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : RISCVTargetInfo(Triple, Opts) {
+    LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
+    IntMaxType = Int64Type = SignedLong;
+    resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n64-S128");
+  }
+
+  bool setABI(const std::string &Name) override {
+    // TODO: support lp64f and lp64d ABIs.
+    if (Name == "lp64") {
+      ABI = Name;
+      return true;
+    }
+    return false;
+  }
+};
+} // namespace targets
+} // namespace clang
+
+#endif // LLVM_CLANG_LIB_BASIC_TARGETS_RISCV_H
Index: lib/Basic/Targets/RISCV.cpp
===================================================================
--- /dev/null
+++ lib/Basic/Targets/RISCV.cpp
@@ -0,0 +1,52 @@
+//===--- RISCV.cpp - Implement RISCV target feature support ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements RISCV TargetInfo objects.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RISCV.h"
+#include "clang/Basic/MacroBuilder.h"
+#include "llvm/ADT/StringSwitch.h"
+
+using namespace clang;
+using namespace clang::targets;
+
+ArrayRef<const char *> RISCVTargetInfo::getGCCRegNames() const {
+  static const char *const GCCRegNames[] = {
+      "x0",  "x1",  "x2",  "x3",  "x4",  "x5",  "x6",  "x7",
+      "x8",  "x9",  "x10", "x11", "x12", "x13", "x14", "x15",
+      "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
+      "x24", "x25", "x26", "x27", "x28", "x29", "x30", "x31"};
+  return llvm::makeArrayRef(GCCRegNames);
+}
+
+ArrayRef<TargetInfo::GCCRegAlias> RISCVTargetInfo::getGCCRegAliases() const {
+  static const TargetInfo::GCCRegAlias GCCRegAliases[] = {
+      {{"zero"}, "x0"}, {{"ra"}, "x1"},  {{"sp"}, "x2"},   {{"gp"}, "x3"},
+      {{"tp"}, "x4"},   {{"t0"}, "x5"},  {{"t1"}, "x6"},   {{"t2"}, "x7"},
+      {{"s0"}, "x8"},   {{"s1"}, "x9"},  {{"a0"}, "x10"},  {{"a1"}, "x11"},
+      {{"a2"}, "x12"},  {{"a3"}, "x13"}, {{"a4"}, "x15"},  {{"a5"}, "x15"},
+      {{"a6"}, "x16"},  {{"a7"}, "x17"}, {{"s2"}, "x18"},  {{"s3"}, "x19"},
+      {{"s4"}, "x20"},  {{"s5"}, "x21"}, {{"s6"}, "x22"},  {{"s7"}, "x23"},
+      {{"s8"}, "x24"},  {{"s9"}, "x25"}, {{"s10"}, "x26"}, {{"s11"}, "x27"},
+      {{"t3"}, "x28"},  {{"t4"}, "x29"}, {{"t5"}, "x30"},  {{"t6"}, "x31"}};
+  return llvm::makeArrayRef(GCCRegAliases);
+}
+
+void RISCVTargetInfo::getTargetDefines(const LangOptions &Opts,
+                                       MacroBuilder &Builder) const {
+  Builder.defineMacro("__ELF__");
+  Builder.defineMacro("__riscv");
+  bool Is64Bit = getTriple().getArch() == llvm::Triple::riscv64;
+  Builder.defineMacro("__riscv_xlen", Is64Bit ? "64" : "32");
+  // TODO: modify when more code models and ABIs are supported.
+  Builder.defineMacro("__riscv_cmodel_medlow");
+  Builder.defineMacro("__riscv_float_abi_soft");
+}
Index: lib/Driver/CMakeLists.txt
===================================================================
--- lib/Driver/CMakeLists.txt
+++ lib/Driver/CMakeLists.txt
@@ -25,6 +25,7 @@
   ToolChains/Arch/ARM.cpp
   ToolChains/Arch/Mips.cpp
   ToolChains/Arch/PPC.cpp
+  ToolChains/Arch/RISCV.cpp
   ToolChains/Arch/Sparc.cpp
   ToolChains/Arch/SystemZ.cpp
   ToolChains/Arch/X86.cpp
Index: lib/Driver/ToolChains/Arch/RISCV.h
===================================================================
--- /dev/null
+++ lib/Driver/ToolChains/Arch/RISCV.h
@@ -0,0 +1,32 @@
+//===--- RISCV.h - RISCV-specific Tool Helpers ------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_ARCH_RISCV_H
+#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_ARCH_RISCV_H
+
+#include "clang/Driver/Driver.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Option/Option.h"
+#include <string>
+#include <vector>
+
+namespace clang {
+namespace driver {
+namespace tools {
+namespace riscv {
+void getRISCVTargetFeatures(const Driver &D, const llvm::opt::ArgList &Args,
+                            std::vector<llvm::StringRef> &Features);
+StringRef getRISCVABI(const llvm::opt::ArgList &Args,
+                      const llvm::Triple &Triple);
+} // end namespace riscv
+} // namespace tools
+} // end namespace driver
+} // end namespace clang
+
+#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_ARCH_RISCV_H
Index: lib/Driver/ToolChains/Arch/RISCV.cpp
===================================================================
--- /dev/null
+++ lib/Driver/ToolChains/Arch/RISCV.cpp
@@ -0,0 +1,61 @@
+//===--- RISCV.cpp - RISCV Helpers for Tools --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RISCV.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/DriverDiagnostic.h"
+#include "clang/Driver/Options.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Support/TargetParser.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang::driver;
+using namespace clang::driver::tools;
+using namespace clang;
+using namespace llvm::opt;
+
+void riscv::getRISCVTargetFeatures(const Driver &D, const ArgList &Args,
+                                   std::vector<StringRef> &Features) {
+  if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
+    StringRef MArch = A->getValue();
+    // TODO: handle rv64
+    std::pair<StringRef, StringRef> MArchSplit = StringRef(MArch).split("rv32");
+    if (!MArchSplit.second.size())
+      return;
+
+    for (char c : MArchSplit.second) {
+      switch (c) {
+      case 'i':
+        break;
+      case 'm':
+        Features.push_back("+m");
+        break;
+      case 'a':
+        Features.push_back("+a");
+        break;
+      case 'f':
+        Features.push_back("+f");
+        break;
+      case 'd':
+        Features.push_back("+d");
+        break;
+      case 'c':
+        Features.push_back("+c");
+        break;
+      }
+    }
+  }
+}
+
+StringRef riscv::getRISCVABI(const ArgList &Args, const llvm::Triple &Triple) {
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
+    return A->getValue();
+
+  return Triple.getArch() == llvm::Triple::riscv32 ? "ilp32" : "lp64";
+}
Index: lib/Driver/ToolChains/Clang.h
===================================================================
--- lib/Driver/ToolChains/Clang.h
+++ lib/Driver/ToolChains/Clang.h
@@ -60,6 +60,8 @@
                         llvm::opt::ArgStringList &CmdArgs) const;
   void AddR600TargetArgs(const llvm::opt::ArgList &Args,
                          llvm::opt::ArgStringList &CmdArgs) const;
+  void AddRISCVTargetArgs(const llvm::opt::ArgList &Args,
+                          llvm::opt::ArgStringList &CmdArgs) const;
   void AddSparcTargetArgs(const llvm::opt::ArgList &Args,
                           llvm::opt::ArgStringList &CmdArgs) const;
   void AddSystemZTargetArgs(const llvm::opt::ArgList &Args,
Index: lib/Driver/ToolChains/Clang.cpp
===================================================================
--- lib/Driver/ToolChains/Clang.cpp
+++ lib/Driver/ToolChains/Clang.cpp
@@ -12,6 +12,7 @@
 #include "Arch/ARM.h"
 #include "Arch/Mips.h"
 #include "Arch/PPC.h"
+#include "Arch/RISCV.h"
 #include "Arch/Sparc.h"
 #include "Arch/SystemZ.h"
 #include "Arch/X86.h"
@@ -306,6 +307,10 @@
   case llvm::Triple::ppc64le:
     ppc::getPPCTargetFeatures(D, Triple, Args, Features);
     break;
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
+    riscv::getRISCVTargetFeatures(D, Args, Features);
+    break;
   case llvm::Triple::systemz:
     systemz::getSystemZTargetFeatures(Args, Features);
     break;
@@ -526,6 +531,14 @@
     }
   }
 
+  switch (Triple.getArch()) {
+    case llvm::Triple::riscv32:
+    case llvm::Triple::riscv64:
+      return !areOptimizationsEnabled(Args);
+    default:
+      break;
+  }
+
   if (Triple.isOSWindows()) {
     switch (Triple.getArch()) {
     case llvm::Triple::x86:
@@ -1261,6 +1274,8 @@
 
   case llvm::Triple::hexagon:
   case llvm::Triple::ppc64le:
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
   case llvm::Triple::systemz:
   case llvm::Triple::xcore:
     return false;
@@ -1370,6 +1385,11 @@
     AddPPCTargetArgs(Args, CmdArgs);
     break;
 
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
+    AddRISCVTargetArgs(Args, CmdArgs);
+    break;
+
   case llvm::Triple::sparc:
   case llvm::Triple::sparcel:
   case llvm::Triple::sparcv9:
@@ -1647,6 +1667,25 @@
   }
 }
 
+void Clang::AddRISCVTargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  // FIXME: currently defaults to the soft-float ABIs. Will need to be
+  // expanded to select ilp32f, ilp32d, lp64f, lp64d when appropiate.
+  const char *ABIName = nullptr;
+  const llvm::Triple &Triple = getToolChain().getTriple();
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
+    ABIName = A->getValue();
+  else if (Triple.getArch() == llvm::Triple::riscv32)
+    ABIName = "ilp32";
+  else if (Triple.getArch() == llvm::Triple::riscv64)
+    ABIName = "lp64";
+  else
+    llvm_unreachable("Unexpected triple!");
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName);
+}
+
 void Clang::AddSparcTargetArgs(const ArgList &Args,
                                ArgStringList &CmdArgs) const {
   sparc::FloatABI FloatABI =
Index: lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- lib/Driver/ToolChains/Gnu.cpp
+++ lib/Driver/ToolChains/Gnu.cpp
@@ -8,13 +8,14 @@
 //===----------------------------------------------------------------------===//
 
 #include "Gnu.h"
-#include "Linux.h"
 #include "Arch/ARM.h"
 #include "Arch/Mips.h"
 #include "Arch/PPC.h"
+#include "Arch/RISCV.h"
 #include "Arch/Sparc.h"
 #include "Arch/SystemZ.h"
 #include "CommonArgs.h"
+#include "Linux.h"
 #include "clang/Basic/VirtualFileSystem.h"
 #include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
 #include "clang/Driver/Compilation.h"
@@ -271,6 +272,10 @@
     return "elf64ppc";
   case llvm::Triple::ppc64le:
     return "elf64lppc";
+  case llvm::Triple::riscv32:
+    return "elf32lriscv";
+  case llvm::Triple::riscv64:
+    return "elf64lriscv";
   case llvm::Triple::sparc:
   case llvm::Triple::sparcel:
     return "elf32_sparc";
@@ -856,6 +861,10 @@
   return A && A->getOption().matches(options::OPT_mmicromips);
 }
 
+static bool isRISCV(llvm::Triple::ArchType Arch) {
+  return Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64;
+}
+
 static Multilib makeMultilib(StringRef commonSuffix) {
   return Multilib(commonSuffix, commonSuffix, commonSuffix);
 }
@@ -1401,6 +1410,41 @@
     Result.Multilibs = AndroidArmMultilibs;
 }
 
+static void findRISCVMultilibs(const Driver &D,
+                               const llvm::Triple &TargetTriple, StringRef Path,
+                               const ArgList &Args, DetectedMultilibs &Result) {
+
+  FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
+  Multilib Ilp32 = makeMultilib("lib32/ilp32").flag("+m32").flag("+mabi=ilp32");
+  Multilib Ilp32f =
+      makeMultilib("lib32/ilp32f").flag("+m32").flag("+mabi=ilp32f");
+  Multilib Ilp32d =
+      makeMultilib("lib32/ilp32d").flag("+m32").flag("+mabi=ilp32d");
+  Multilib Lp64 = makeMultilib("lib64/lp64").flag("+m64").flag("+mabi=lp64");
+  Multilib Lp64f = makeMultilib("lib64/lp64f").flag("+m64").flag("+mabi=lp64f");
+  Multilib Lp64d = makeMultilib("lib64/lp64d").flag("+m64").flag("+mabi=lp64d");
+  MultilibSet RISCVMultilibs =
+      MultilibSet()
+          .Either({Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
+          .FilterOut(NonExistent);
+
+  Multilib::flags_list Flags;
+  bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
+  StringRef ABIName = tools::riscv::getRISCVABI(Args, TargetTriple);
+
+  addMultilibFlag(!IsRV64, "m32", Flags);
+  addMultilibFlag(IsRV64, "m64", Flags);
+  addMultilibFlag(ABIName == "ilp32", "mabi=ilp32", Flags);
+  addMultilibFlag(ABIName == "ilp32f", "mabi=ilp32f", Flags);
+  addMultilibFlag(ABIName == "ilp32d", "mabi=ilp32d", Flags);
+  addMultilibFlag(ABIName == "lp64", "mabi=lp64", Flags);
+  addMultilibFlag(ABIName == "lp64f", "mabi=lp64f", Flags);
+  addMultilibFlag(ABIName == "lp64d", "mabi=lp64d", Flags);
+
+  if (RISCVMultilibs.select(Flags, Result.SelectedMultilib))
+    Result.Multilibs = RISCVMultilibs;
+}
+
 static bool findBiarchMultilibs(const Driver &D,
                                 const llvm::Triple &TargetTriple,
                                 StringRef Path, const ArgList &Args,
@@ -1783,6 +1827,10 @@
       "powerpc64le-linux-gnu", "powerpc64le-unknown-linux-gnu",
       "powerpc64le-suse-linux", "ppc64le-redhat-linux"};
 
+  static const char *const RISCV32LibDirs[] = {"/lib", "/lib32"};
+  static const char *const RISCVTriples[] = {"riscv32-unknown-linux-gnu",
+                                             "riscv64-unknown-linux-gnu"};
+
   static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
   static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
                                                "sparcv8-linux-gnu"};
@@ -1928,6 +1976,12 @@
     LibDirs.append(begin(PPC64LELibDirs), end(PPC64LELibDirs));
     TripleAliases.append(begin(PPC64LETriples), end(PPC64LETriples));
     break;
+  case llvm::Triple::riscv32:
+    LibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
+    BiarchLibDirs.append(begin(RISCV32LibDirs), end(RISCV32LibDirs));
+    TripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
+    BiarchTripleAliases.append(begin(RISCVTriples), end(RISCVTriples));
+    break;
   case llvm::Triple::sparc:
   case llvm::Triple::sparcel:
     LibDirs.append(begin(SPARCv8LibDirs), end(SPARCv8LibDirs));
@@ -2025,6 +2079,8 @@
   } else if (tools::isMipsArch(TargetArch)) {
     if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Detected))
       return false;
+  } else if (isRISCV(TargetArch)) {
+    findRISCVMultilibs(D, TargetTriple, Path, Args, Detected);
   } else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
                                   NeedsBiarchSuffix, Detected)) {
     return false;
@@ -2240,6 +2296,8 @@
   case llvm::Triple::ppc:
   case llvm::Triple::ppc64:
   case llvm::Triple::ppc64le:
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
   case llvm::Triple::systemz:
   case llvm::Triple::mips:
   case llvm::Triple::mipsel:
Index: lib/Driver/ToolChains/Linux.cpp
===================================================================
--- lib/Driver/ToolChains/Linux.cpp
+++ lib/Driver/ToolChains/Linux.cpp
@@ -11,6 +11,7 @@
 #include "Arch/ARM.h"
 #include "Arch/Mips.h"
 #include "Arch/PPC.h"
+#include "Arch/RISCV.h"
 #include "CommonArgs.h"
 #include "clang/Basic/VirtualFileSystem.h"
 #include "clang/Config/config.h"
@@ -176,6 +177,9 @@
       Triple.getEnvironment() == llvm::Triple::GNUX32)
     return "libx32";
 
+  if (Triple.getArch() == llvm::Triple::riscv32)
+    return "lib32";
+
   return Triple.isArch32Bit() ? "lib" : "lib64";
 }
 
@@ -226,6 +230,8 @@
   const bool IsAndroid = Triple.isAndroid();
   const bool IsMips = tools::isMipsArch(Arch);
   const bool IsHexagon = Arch == llvm::Triple::hexagon;
+  const bool IsRISCV =
+      Arch == llvm::Triple::riscv32 || Arch == llvm::Triple::riscv64;
 
   if (IsMips && !SysRoot.empty())
     ExtraOpts.push_back("--sysroot=" + SysRoot);
@@ -333,6 +339,11 @@
   addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
   addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
   addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
+  if (IsRISCV) {
+    StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple);
+    addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths);
+    addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths);
+  }
 
   // Try walking via the GCC triple path in case of biarch or multiarch GCC
   // installations with strange symlinks.
@@ -511,6 +522,18 @@
     Loader =
         (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2";
     break;
+  case llvm::Triple::riscv32: {
+    StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple);
+    LibDir = "lib";
+    Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str();
+    break;
+  }
+  case llvm::Triple::riscv64: {
+    StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple);
+    LibDir = "lib";
+    Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str();
+    break;
+  }
   case llvm::Triple::sparc:
   case llvm::Triple::sparcel:
     LibDir = "lib";
Index: test/Driver/Inputs/multilib_riscv_linux_sdk/riscv64-unknown-linux-gnu/bin/ld
===================================================================
--- /dev/null
+++ test/Driver/Inputs/multilib_riscv_linux_sdk/riscv64-unknown-linux-gnu/bin/ld
@@ -0,0 +1 @@
+#!/bin/true
Index: test/Driver/frame-pointer.c
===================================================================
--- test/Driver/frame-pointer.c
+++ test/Driver/frame-pointer.c
@@ -33,6 +33,18 @@
 // RUN: %clang -target mips64el-linux-gnu -### -S -O0 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK0-32 %s
 // RUN: %clang -target mips64el-linux-gnu -### -S -O1 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK1-32 %s
 
+// RUN: %clang -target riscv32-unknown-elf -### -S -O0 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK0-32 %s
+// RUN: %clang -target riscv32-unknown-elf -### -S -O1 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK1-32 %s
+// RUN: %clang -target riscv32-unknown-elf -### -S -O2 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK2-32 %s
+// RUN: %clang -target riscv32-unknown-elf -### -S -O3 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK3-32 %s
+// RUN: %clang -target riscv32-unknown-elf -### -S -Os %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECKs-32 %s
+
+// RUN: %clang -target riscv64-unknown-elf -### -S -O0 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK0-64 %s
+// RUN: %clang -target riscv64-unknown-elf -### -S -O1 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK1-64 %s
+// RUN: %clang -target riscv64-unknown-elf -### -S -O2 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK2-64 %s
+// RUN: %clang -target riscv64-unknown-elf -### -S -O3 %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECK3-64 %s
+// RUN: %clang -target riscv64-unknown-elf -### -S -Os %s -o %t.s 2>&1 | FileCheck -check-prefix=CHECKs-64 %s
+
 // CHECK0-32: -mdisable-fp-elim
 // CHECK1-32-NOT: -mdisable-fp-elim
 // CHECK2-32-NOT: -mdisable-fp-elim
Index: test/Driver/riscv-abi.c
===================================================================
--- /dev/null
+++ test/Driver/riscv-abi.c
@@ -0,0 +1,47 @@
+// RUN: %clang -target riscv32-unknown-elf %s -### -o %t.o 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-ILP32 %s
+// RUN: %clang -target riscv32-unknown-elf %s -### -o %t.o -mabi=ilp32 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-ILP32 %s
+
+// CHECK-ILP32: "-target-abi" "ilp32"
+
+// TODO: ilp32f support.
+// RUN: not %clang -target riscv32-unknown-elf %s -o %t.o -mabi=ilp32f 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-ILP32F %s
+
+// CHECK-ILP32F: error: unknown target ABI 'ilp32f'
+
+// TODO: ilp32d support.
+// RUN: not %clang -target riscv32-unknown-elf %s -o %t.o -mabi=ilp32d 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-ILP32D %s
+
+// CHECK-ILP32D: error: unknown target ABI 'ilp32d'
+
+// RUN: not %clang -target riscv32-unknown-elf %s -o %t.o -mabi=lp64 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-RV32-LP64 %s
+
+// CHECK-RV32-LP64: error: unknown target ABI 'lp64'
+
+// RUN: %clang -target riscv64-unknown-elf %s -### -o %t.o 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-LP64 %s
+// RUN: %clang -target riscv64-unknown-elf %s -### -o %t.o -mabi=lp64 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-LP64 %s
+
+// CHECK-LP64: "-target-abi" "lp64"
+
+// TODO: lp64f support.
+// RUN: not %clang -target riscv64-unknown-elf %s -o %t.o -mabi=lp64f 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-LP64F %s
+
+// CHECK-LP64F: error: unknown target ABI 'lp64f'
+
+// TODO: lp64d support.
+// RUN: not %clang -target riscv64-unknown-elf %s -o %t.o -mabi=lp64d 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-LP64D %s
+
+// CHECK-LP64D: error: unknown target ABI 'lp64d'
+
+// RUN: not %clang -target riscv64-unknown-elf %s -o %t.o -mabi=ilp32 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-RV64-ILP32 %s
+
+// CHECK-RV64-ILP32: error: unknown target ABI 'ilp32'
Index: test/Driver/riscv-features.c
===================================================================
--- /dev/null
+++ test/Driver/riscv-features.c
@@ -0,0 +1,4 @@
+// RUN: %clang -target riscv32-unknown-elf -### %s -fsyntax-only 2>&1 | FileCheck %s
+// RUN: %clang -target riscv64-unknown-elf -### %s -fsyntax-only 2>&1 | FileCheck %s
+
+// CHECK: fno-signed-char
Index: test/Driver/riscv32-toolchain.c
===================================================================
--- /dev/null
+++ test/Driver/riscv32-toolchain.c
@@ -0,0 +1,75 @@
+// A basic clang -cc1 command-line, and simple environment check.
+
+// RUN: %clang %s -### -no-canonical-prefixes -target riscv32 2>&1 | FileCheck -check-prefix=CC1 %s
+// CC1: clang{{.*}} "-cc1" "-triple" "riscv32"
+
+
+// RUN: %clang %s -### -no-canonical-prefixes \
+// RUN:   -target riscv32-linux-unknown-elf \
+// RUN:   --gcc-toolchain=%S/Inputs/multilib_riscv_linux_sdk \
+// RUN:   --sysroot=%S/Inputs/multilib_riscv_linux_sdk/sysroot 2>&1 \
+// RUN:   | FileCheck -check-prefix=CC1-RV32-LINUX-ILP32 %s
+
+// CC1-RV32-LINUX-ILP32: "{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld"
+// CC1-RV32-LINUX-ILP32: "--sysroot={{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot"
+// CC1-RV32-LINUX-ILP32: "-m" "elf32lriscv"
+// CC1-RV32-LINUX-ILP32: "-dynamic-linker" "/lib/ld-linux-riscv32-ilp32.so.1"
+// CC1-RV32-LINUX-ILP32: "{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/lib32/ilp32/crtbegin.o"
+// CC1-RV32-LINUX-ILP32: "-L{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/lib32/ilp32"
+// CC1-RV32-LINUX-ILP32: "-L{{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot/lib32/ilp32"
+// CC1-RV32-LINUX-ILP32: "-L{{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot/usr/lib32/ilp32"
+
+// RUN: %clang %s -### -no-canonical-prefixes \
+// RUN:   -target riscv32-linux-unknown-elf -march=rv32imafd -mabi=ilp32d \
+// RUN:   --gcc-toolchain=%S/Inputs/multilib_riscv_linux_sdk \
+// RUN:   --sysroot=%S/Inputs/multilib_riscv_linux_sdk/sysroot 2>&1 \
+// RUN:   | FileCheck -check-prefix=CC1-RV32-LINUX-ILP32D %s
+
+// CC1-RV32-LINUX-ILP32D: "{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld"
+// CC1-RV32-LINUX-ILP32D: "--sysroot={{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot"
+// CC1-RV32-LINUX-ILP32D: "-m" "elf32lriscv"
+// CC1-RV32-LINUX-ILP32D: "-dynamic-linker" "/lib/ld-linux-riscv32-ilp32d.so.1"
+// CC1-RV32-LINUX-ILP32D: "{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/lib32/ilp32d/crtbegin.o"
+// CC1-RV32-LINUX-ILP32D: "-L{{.*}}/Inputs/multilib_riscv_linux_sdk/lib/gcc/riscv64-unknown-linux-gnu/7.2.0/lib32/ilp32d"
+// CC1-RV32-LINUX-ILP32D: "-L{{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot/lib32/ilp32d"
+// CC1-RV32-LINUX-ILP32D: "-L{{.*}}/Inputs/multilib_riscv_linux_sdk/sysroot/usr/lib32/ilp32d"
+
+// RUN: %clang -target riscv32 %s -emit-llvm -S -o - | FileCheck %s
+
+typedef __builtin_va_list va_list;
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+typedef __WCHAR_TYPE__ wchar_t;
+
+// CHECK: @align_c = global i32 1
+int align_c = __alignof(char);
+
+// CHECK: @align_s = global i32 2
+int align_s = __alignof(short);
+
+// CHECK: @align_i = global i32 4
+int align_i = __alignof(int);
+
+// CHECK: @align_wc = global i32 4
+int align_wc = __alignof(wchar_t);
+
+// CHECK: @align_l = global i32 4
+int align_l = __alignof(long);
+
+// CHECK: @align_ll = global i32 8
+int align_ll = __alignof(long long);
+
+// CHECK: @align_p = global i32 4
+int align_p = __alignof(void*);
+
+// CHECK: @align_f = global i32 4
+int align_f = __alignof(float);
+
+// CHECK: @align_d = global i32 8
+int align_d = __alignof(double);
+
+// CHECK: @align_ld = global i32 16
+int align_ld = __alignof(long double);
+
+// CHECK: @align_vl = global i32 4
+int align_vl = __alignof(va_list);
Index: test/Driver/riscv64-toolchain.c
===================================================================
--- /dev/null
+++ test/Driver/riscv64-toolchain.c
@@ -0,0 +1,44 @@
+// A basic clang -cc1 command-line, and simple environment check.
+
+// RUN: %clang %s -### -no-canonical-prefixes -target riscv64 2>&1 | FileCheck -check-prefix=CC1 %s
+// CC1: clang{{.*}} "-cc1" "-triple" "riscv64"
+
+// RUN: %clang -target riscv64 %s -emit-llvm -S -o - | FileCheck %s
+
+typedef __builtin_va_list va_list;
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+typedef __WCHAR_TYPE__ wchar_t;
+
+// CHECK: @align_c = global i32 1
+int align_c = __alignof(char);
+
+// CHECK: @align_s = global i32 2
+int align_s = __alignof(short);
+
+// CHECK: @align_i = global i32 4
+int align_i = __alignof(int);
+
+// CHECK: @align_wc = global i32 4
+int align_wc = __alignof(wchar_t);
+
+// CHECK: @align_l = global i32 8
+int align_l = __alignof(long);
+
+// CHECK: @align_ll = global i32 8
+int align_ll = __alignof(long long);
+
+// CHECK: @align_p = global i32 8
+int align_p = __alignof(void*);
+
+// CHECK: @align_f = global i32 4
+int align_f = __alignof(float);
+
+// CHECK: @align_d = global i32 8
+int align_d = __alignof(double);
+
+// CHECK: @align_ld = global i32 16
+int align_ld = __alignof(long double);
+
+// CHECK: @align_vl = global i32 8
+int align_vl = __alignof(va_list);
Index: test/Preprocessor/init.c
===================================================================
--- test/Preprocessor/init.c
+++ test/Preprocessor/init.c
@@ -10003,3 +10003,398 @@
 // ARM-DARWIN-BAREMETAL-64: #define __PTRDIFF_TYPE__ long int
 // ARM-DARWIN-BAREMETAL-64: #define __SIZE_TYPE__ long unsigned int
 
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=riscv32 < /dev/null \
+// RUN:   | FileCheck -match-full-lines -check-prefix=RISCV32 %s
+// RISCV32: #define _ILP32 1
+// RISCV32: #define __ATOMIC_ACQUIRE 2
+// RISCV32: #define __ATOMIC_ACQ_REL 4
+// RISCV32: #define __ATOMIC_CONSUME 1
+// RISCV32: #define __ATOMIC_RELAXED 0
+// RISCV32: #define __ATOMIC_RELEASE 3
+// RISCV32: #define __ATOMIC_SEQ_CST 5
+// RISCV32: #define __BIGGEST_ALIGNMENT__ 16
+// RISCV32: #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+// RISCV32: #define __CHAR16_TYPE__ unsigned short
+// RISCV32: #define __CHAR32_TYPE__ unsigned int
+// RISCV32: #define __CHAR_BIT__ 8
+// RISCV32: #define __DBL_DECIMAL_DIG__ 17
+// RISCV32: #define __DBL_DENORM_MIN__ 4.9406564584124654e-324
+// RISCV32: #define __DBL_DIG__ 15
+// RISCV32: #define __DBL_EPSILON__ 2.2204460492503131e-16
+// RISCV32: #define __DBL_HAS_DENORM__ 1
+// RISCV32: #define __DBL_HAS_INFINITY__ 1
+// RISCV32: #define __DBL_HAS_QUIET_NAN__ 1
+// RISCV32: #define __DBL_MANT_DIG__ 53
+// RISCV32: #define __DBL_MAX_10_EXP__ 308
+// RISCV32: #define __DBL_MAX_EXP__ 1024
+// RISCV32: #define __DBL_MAX__ 1.7976931348623157e+308
+// RISCV32: #define __DBL_MIN_10_EXP__ (-307)
+// RISCV32: #define __DBL_MIN_EXP__ (-1021)
+// RISCV32: #define __DBL_MIN__ 2.2250738585072014e-308
+// RISCV32: #define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
+// RISCV32: #define __ELF__ 1
+// RISCV32: #define __FINITE_MATH_ONLY__ 0
+// RISCV32: #define __FLT_DECIMAL_DIG__ 9
+// RISCV32: #define __FLT_DENORM_MIN__ 1.40129846e-45F
+// RISCV32: #define __FLT_DIG__ 6
+// RISCV32: #define __FLT_EPSILON__ 1.19209290e-7F
+// RISCV32: #define __FLT_EVAL_METHOD__ 0
+// RISCV32: #define __FLT_HAS_DENORM__ 1
+// RISCV32: #define __FLT_HAS_INFINITY__ 1
+// RISCV32: #define __FLT_HAS_QUIET_NAN__ 1
+// RISCV32: #define __FLT_MANT_DIG__ 24
+// RISCV32: #define __FLT_MAX_10_EXP__ 38
+// RISCV32: #define __FLT_MAX_EXP__ 128
+// RISCV32: #define __FLT_MAX__ 3.40282347e+38F
+// RISCV32: #define __FLT_MIN_10_EXP__ (-37)
+// RISCV32: #define __FLT_MIN_EXP__ (-125)
+// RISCV32: #define __FLT_MIN__ 1.17549435e-38F
+// RISCV32: #define __FLT_RADIX__ 2
+// RISCV32: #define __GCC_ATOMIC_BOOL_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_CHAR_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_INT_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_LLONG_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_LONG_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_POINTER_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_SHORT_LOCK_FREE 1
+// RISCV32: #define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
+// RISCV32: #define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 1
+// RISCV32: #define __GNUC_MINOR__ {{.*}}
+// RISCV32: #define __GNUC_PATCHLEVEL__ {{.*}}
+// RISCV32: #define __GNUC_STDC_INLINE__ 1
+// RISCV32: #define __GNUC__ {{.*}}
+// RISCV32: #define __GXX_ABI_VERSION {{.*}}
+// RISCV32: #define __ILP32__ 1
+// RISCV32: #define __INT16_C_SUFFIX__
+// RISCV32: #define __INT16_MAX__ 32767
+// RISCV32: #define __INT16_TYPE__ short
+// RISCV32: #define __INT32_C_SUFFIX__
+// RISCV32: #define __INT32_MAX__ 2147483647
+// RISCV32: #define __INT32_TYPE__ int
+// RISCV32: #define __INT64_C_SUFFIX__ LL
+// RISCV32: #define __INT64_MAX__ 9223372036854775807LL
+// RISCV32: #define __INT64_TYPE__ long long int
+// RISCV32: #define __INT8_C_SUFFIX__
+// RISCV32: #define __INT8_MAX__ 127
+// RISCV32: #define __INT8_TYPE__ signed char
+// RISCV32: #define __INTMAX_C_SUFFIX__ LL
+// RISCV32: #define __INTMAX_MAX__ 9223372036854775807LL
+// RISCV32: #define __INTMAX_TYPE__ long long int
+// RISCV32: #define __INTMAX_WIDTH__ 64
+// RISCV32: #define __INTPTR_MAX__ 2147483647
+// RISCV32: #define __INTPTR_TYPE__ int
+// RISCV32: #define __INTPTR_WIDTH__ 32
+// TODO: RISC-V GCC defines INT_FAST16 as int
+// RISCV32: #define __INT_FAST16_MAX__ 32767
+// RISCV32: #define __INT_FAST16_TYPE__ short
+// RISCV32: #define __INT_FAST32_MAX__ 2147483647
+// RISCV32: #define __INT_FAST32_TYPE__ int
+// RISCV32: #define __INT_FAST64_MAX__ 9223372036854775807LL
+// RISCV32: #define __INT_FAST64_TYPE__ long long int
+// TODO: RISC-V GCC defines INT_FAST8 as int
+// RISCV32: #define __INT_FAST8_MAX__ 127
+// RISCV32: #define __INT_FAST8_TYPE__ signed char
+// RISCV32: #define __INT_LEAST16_MAX__ 32767
+// RISCV32: #define __INT_LEAST16_TYPE__ short
+// RISCV32: #define __INT_LEAST32_MAX__ 2147483647
+// RISCV32: #define __INT_LEAST32_TYPE__ int
+// RISCV32: #define __INT_LEAST64_MAX__ 9223372036854775807LL
+// RISCV32: #define __INT_LEAST64_TYPE__ long long int
+// RISCV32: #define __INT_LEAST8_MAX__ 127
+// RISCV32: #define __INT_LEAST8_TYPE__ signed char
+// RISCV32: #define __INT_MAX__ 2147483647
+// RISCV32: #define __LDBL_DECIMAL_DIG__ 36
+// RISCV32: #define __LDBL_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966L
+// RISCV32: #define __LDBL_DIG__ 33
+// RISCV32: #define __LDBL_EPSILON__ 1.92592994438723585305597794258492732e-34L
+// RISCV32: #define __LDBL_HAS_DENORM__ 1
+// RISCV32: #define __LDBL_HAS_INFINITY__ 1
+// RISCV32: #define __LDBL_HAS_QUIET_NAN__ 1
+// RISCV32: #define __LDBL_MANT_DIG__ 113
+// RISCV32: #define __LDBL_MAX_10_EXP__ 4932
+// RISCV32: #define __LDBL_MAX_EXP__ 16384
+// RISCV32: #define __LDBL_MAX__ 1.18973149535723176508575932662800702e+4932L
+// RISCV32: #define __LDBL_MIN_10_EXP__ (-4931)
+// RISCV32: #define __LDBL_MIN_EXP__ (-16381)
+// RISCV32: #define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
+// RISCV32: #define __LITTLE_ENDIAN__ 1
+// RISCV32: #define __LONG_LONG_MAX__ 9223372036854775807LL
+// RISCV32: #define __LONG_MAX__ 2147483647L
+// RISCV32: #define __NO_INLINE__ 1
+// RISCV32: #define __POINTER_WIDTH__ 32
+// RISCV32: #define __PRAGMA_REDEFINE_EXTNAME 1
+// RISCV32: #define __PTRDIFF_MAX__ 2147483647
+// RISCV32: #define __PTRDIFF_TYPE__ int
+// RISCV32: #define __PTRDIFF_WIDTH__ 32
+// RISCV32: #define __SCHAR_MAX__ 127
+// RISCV32: #define __SHRT_MAX__ 32767
+// RISCV32: #define __SIG_ATOMIC_MAX__ 2147483647
+// RISCV32: #define __SIG_ATOMIC_WIDTH__ 32
+// RISCV32: #define __SIZEOF_DOUBLE__ 8
+// RISCV32: #define __SIZEOF_FLOAT__ 4
+// RISCV32: #define __SIZEOF_INT__ 4
+// RISCV32: #define __SIZEOF_LONG_DOUBLE__ 16
+// RISCV32: #define __SIZEOF_LONG_LONG__ 8
+// RISCV32: #define __SIZEOF_LONG__ 4
+// RISCV32: #define __SIZEOF_POINTER__ 4
+// RISCV32: #define __SIZEOF_PTRDIFF_T__ 4
+// RISCV32: #define __SIZEOF_SHORT__ 2
+// RISCV32: #define __SIZEOF_SIZE_T__ 4
+// RISCV32: #define __SIZEOF_WCHAR_T__ 4
+// RISCV32: #define __SIZEOF_WINT_T__ 4
+// RISCV32: #define __SIZE_MAX__ 4294967295U
+// RISCV32: #define __SIZE_TYPE__ unsigned int
+// RISCV32: #define __SIZE_WIDTH__ 32
+// RISCV32: #define __STDC_HOSTED__ 0
+// RISCV32: #define __STDC_UTF_16__ 1
+// RISCV32: #define __STDC_UTF_32__ 1
+// RISCV32: #define __STDC_VERSION__ 201112L
+// RISCV32: #define __STDC__ 1
+// RISCV32: #define __UINT16_C_SUFFIX__
+// RISCV32: #define __UINT16_MAX__ 65535
+// RISCV32: #define __UINT16_TYPE__ unsigned short
+// RISCV32: #define __UINT32_C_SUFFIX__ U
+// RISCV32: #define __UINT32_MAX__ 4294967295U
+// RISCV32: #define __UINT32_TYPE__ unsigned int
+// RISCV32: #define __UINT64_C_SUFFIX__ ULL
+// RISCV32: #define __UINT64_MAX__ 18446744073709551615ULL
+// RISCV32: #define __UINT64_TYPE__ long long unsigned int
+// RISCV32: #define __UINT8_C_SUFFIX__
+// RISCV32: #define __UINT8_MAX__ 255
+// RISCV32: #define __UINT8_TYPE__ unsigned char
+// RISCV32: #define __UINTMAX_C_SUFFIX__ ULL
+// RISCV32: #define __UINTMAX_MAX__ 18446744073709551615ULL
+// RISCV32: #define __UINTMAX_TYPE__ long long unsigned int
+// RISCV32: #define __UINTMAX_WIDTH__ 64
+// RISCV32: #define __UINTPTR_MAX__ 4294967295U
+// RISCV32: #define __UINTPTR_TYPE__ unsigned int
+// RISCV32: #define __UINTPTR_WIDTH__ 32
+// TODO: RISC-V GCC defines UINT_FAST16 to be unsigned int
+// RISCV32: #define __UINT_FAST16_MAX__ 65535
+// RISCV32: #define __UINT_FAST16_TYPE__ unsigned short
+// RISCV32: #define __UINT_FAST32_MAX__ 4294967295U
+// RISCV32: #define __UINT_FAST32_TYPE__ unsigned int
+// RISCV32: #define __UINT_FAST64_MAX__ 18446744073709551615ULL
+// RISCV32: #define __UINT_FAST64_TYPE__ long long unsigned int
+// TODO: RISC-V GCC defines UINT_FAST8 to be unsigned int
+// RISCV32: #define __UINT_FAST8_MAX__ 255
+// RISCV32: #define __UINT_FAST8_TYPE__ unsigned char
+// RISCV32: #define __UINT_LEAST16_MAX__ 65535
+// RISCV32: #define __UINT_LEAST16_TYPE__ unsigned short
+// RISCV32: #define __UINT_LEAST32_MAX__ 4294967295U
+// RISCV32: #define __UINT_LEAST32_TYPE__ unsigned int
+// RISCV32: #define __UINT_LEAST64_MAX__ 18446744073709551615ULL
+// RISCV32: #define __UINT_LEAST64_TYPE__ long long unsigned int
+// RISCV32: #define __UINT_LEAST8_MAX__ 255
+// RISCV32: #define __UINT_LEAST8_TYPE__ unsigned char
+// RISCV32: #define __USER_LABEL_PREFIX__
+// RISCV32: #define __WCHAR_MAX__ 2147483647
+// RISCV32: #define __WCHAR_TYPE__ int
+// RISCV32: #define __WCHAR_WIDTH__ 32
+// RISCV32: #define __WINT_TYPE__ unsigned int
+// RISCV32: #define __WINT_UNSIGNED__ 1
+// RISCV32: #define __WINT_WIDTH__ 32
+// RISCV32: #define __riscv 1
+// RISCV32: #define __riscv_cmodel_medlow 1
+// RISCV32: #define __riscv_float_abi_soft 1
+// RISCV32: #define __riscv_xlen 32
+
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=riscv64 < /dev/null \
+// RUN:   | FileCheck -match-full-lines -check-prefix=RISCV64 %s
+// RISCV64: #define _LP64 1
+// RISCV64: #define __ATOMIC_ACQUIRE 2
+// RISCV64: #define __ATOMIC_ACQ_REL 4
+// RISCV64: #define __ATOMIC_CONSUME 1
+// RISCV64: #define __ATOMIC_RELAXED 0
+// RISCV64: #define __ATOMIC_RELEASE 3
+// RISCV64: #define __ATOMIC_SEQ_CST 5
+// RISCV64: #define __BIGGEST_ALIGNMENT__ 16
+// RISCV64: #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+// RISCV64: #define __CHAR16_TYPE__ unsigned short
+// RISCV64: #define __CHAR32_TYPE__ unsigned int
+// RISCV64: #define __CHAR_BIT__ 8
+// RISCV64: #define __DBL_DECIMAL_DIG__ 17
+// RISCV64: #define __DBL_DENORM_MIN__ 4.9406564584124654e-324
+// RISCV64: #define __DBL_DIG__ 15
+// RISCV64: #define __DBL_EPSILON__ 2.2204460492503131e-16
+// RISCV64: #define __DBL_HAS_DENORM__ 1
+// RISCV64: #define __DBL_HAS_INFINITY__ 1
+// RISCV64: #define __DBL_HAS_QUIET_NAN__ 1
+// RISCV64: #define __DBL_MANT_DIG__ 53
+// RISCV64: #define __DBL_MAX_10_EXP__ 308
+// RISCV64: #define __DBL_MAX_EXP__ 1024
+// RISCV64: #define __DBL_MAX__ 1.7976931348623157e+308
+// RISCV64: #define __DBL_MIN_10_EXP__ (-307)
+// RISCV64: #define __DBL_MIN_EXP__ (-1021)
+// RISCV64: #define __DBL_MIN__ 2.2250738585072014e-308
+// RISCV64: #define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
+// RISCV64: #define __ELF__ 1
+// RISCV64: #define __FINITE_MATH_ONLY__ 0
+// RISCV64: #define __FLT_DECIMAL_DIG__ 9
+// RISCV64: #define __FLT_DENORM_MIN__ 1.40129846e-45F
+// RISCV64: #define __FLT_DIG__ 6
+// RISCV64: #define __FLT_EPSILON__ 1.19209290e-7F
+// RISCV64: #define __FLT_EVAL_METHOD__ 0
+// RISCV64: #define __FLT_HAS_DENORM__ 1
+// RISCV64: #define __FLT_HAS_INFINITY__ 1
+// RISCV64: #define __FLT_HAS_QUIET_NAN__ 1
+// RISCV64: #define __FLT_MANT_DIG__ 24
+// RISCV64: #define __FLT_MAX_10_EXP__ 38
+// RISCV64: #define __FLT_MAX_EXP__ 128
+// RISCV64: #define __FLT_MAX__ 3.40282347e+38F
+// RISCV64: #define __FLT_MIN_10_EXP__ (-37)
+// RISCV64: #define __FLT_MIN_EXP__ (-125)
+// RISCV64: #define __FLT_MIN__ 1.17549435e-38F
+// RISCV64: #define __FLT_RADIX__ 2
+// RISCV64: #define __GCC_ATOMIC_BOOL_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_CHAR_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_INT_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_LLONG_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_LONG_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_POINTER_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_SHORT_LOCK_FREE 1
+// RISCV64: #define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
+// RISCV64: #define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 1
+// RISCV64: #define __GNUC_MINOR__ {{.*}}
+// RISCV64: #define __GNUC_PATCHLEVEL__ {{.*}}
+// RISCV64: #define __GNUC_STDC_INLINE__ 1
+// RISCV64: #define __GNUC__ {{.*}}
+// RISCV64: #define __GXX_ABI_VERSION {{.*}}
+// RISCV64: #define __INT16_C_SUFFIX__
+// RISCV64: #define __INT16_MAX__ 32767
+// RISCV64: #define __INT16_TYPE__ short
+// RISCV64: #define __INT32_C_SUFFIX__
+// RISCV64: #define __INT32_MAX__ 2147483647
+// RISCV64: #define __INT32_TYPE__ int
+// RISCV64: #define __INT64_C_SUFFIX__ L
+// RISCV64: #define __INT64_MAX__ 9223372036854775807L
+// RISCV64: #define __INT64_TYPE__ long int
+// RISCV64: #define __INT8_C_SUFFIX__
+// RISCV64: #define __INT8_MAX__ 127
+// RISCV64: #define __INT8_TYPE__ signed char
+// RISCV64: #define __INTMAX_C_SUFFIX__ L
+// RISCV64: #define __INTMAX_MAX__ 9223372036854775807L
+// RISCV64: #define __INTMAX_TYPE__ long int
+// RISCV64: #define __INTMAX_WIDTH__ 64
+// RISCV64: #define __INTPTR_MAX__ 9223372036854775807L
+// RISCV64: #define __INTPTR_TYPE__ long int
+// RISCV64: #define __INTPTR_WIDTH__ 64
+// TODO: RISC-V GCC defines INT_FAST16 as int
+// RISCV64: #define __INT_FAST16_MAX__ 32767
+// RISCV64: #define __INT_FAST16_TYPE__ short
+// RISCV64: #define __INT_FAST32_MAX__ 2147483647
+// RISCV64: #define __INT_FAST32_TYPE__ int
+// RISCV64: #define __INT_FAST64_MAX__ 9223372036854775807L
+// RISCV64: #define __INT_FAST64_TYPE__ long int
+// TODO: RISC-V GCC defines INT_FAST8 as int
+// RISCV64: #define __INT_FAST8_MAX__ 127
+// RISCV64: #define __INT_FAST8_TYPE__ signed char
+// RISCV64: #define __INT_LEAST16_MAX__ 32767
+// RISCV64: #define __INT_LEAST16_TYPE__ short
+// RISCV64: #define __INT_LEAST32_MAX__ 2147483647
+// RISCV64: #define __INT_LEAST32_TYPE__ int
+// RISCV64: #define __INT_LEAST64_MAX__ 9223372036854775807L
+// RISCV64: #define __INT_LEAST64_TYPE__ long int
+// RISCV64: #define __INT_LEAST8_MAX__ 127
+// RISCV64: #define __INT_LEAST8_TYPE__ signed char
+// RISCV64: #define __INT_MAX__ 2147483647
+// RISCV64: #define __LDBL_DECIMAL_DIG__ 36
+// RISCV64: #define __LDBL_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966L
+// RISCV64: #define __LDBL_DIG__ 33
+// RISCV64: #define __LDBL_EPSILON__ 1.92592994438723585305597794258492732e-34L
+// RISCV64: #define __LDBL_HAS_DENORM__ 1
+// RISCV64: #define __LDBL_HAS_INFINITY__ 1
+// RISCV64: #define __LDBL_HAS_QUIET_NAN__ 1
+// RISCV64: #define __LDBL_MANT_DIG__ 113
+// RISCV64: #define __LDBL_MAX_10_EXP__ 4932
+// RISCV64: #define __LDBL_MAX_EXP__ 16384
+// RISCV64: #define __LDBL_MAX__ 1.18973149535723176508575932662800702e+4932L
+// RISCV64: #define __LDBL_MIN_10_EXP__ (-4931)
+// RISCV64: #define __LDBL_MIN_EXP__ (-16381)
+// RISCV64: #define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
+// RISCV64: #define __LITTLE_ENDIAN__ 1
+// RISCV64: #define __LONG_LONG_MAX__ 9223372036854775807LL
+// RISCV64: #define __LONG_MAX__ 9223372036854775807L
+// RISCV64: #define __LP64__ 1
+// RISCV64: #define __NO_INLINE__ 1
+// RISCV64: #define __POINTER_WIDTH__ 64
+// RISCV64: #define __PRAGMA_REDEFINE_EXTNAME 1
+// RISCV64: #define __PTRDIFF_MAX__ 9223372036854775807L
+// RISCV64: #define __PTRDIFF_TYPE__ long int
+// RISCV64: #define __PTRDIFF_WIDTH__ 64
+// RISCV64: #define __SCHAR_MAX__ 127
+// RISCV64: #define __SHRT_MAX__ 32767
+// RISCV64: #define __SIG_ATOMIC_MAX__ 2147483647
+// RISCV64: #define __SIG_ATOMIC_WIDTH__ 32
+// RISCV64: #define __SIZEOF_DOUBLE__ 8
+// RISCV64: #define __SIZEOF_FLOAT__ 4
+// RISCV64: #define __SIZEOF_INT__ 4
+// RISCV64: #define __SIZEOF_LONG_DOUBLE__ 16
+// RISCV64: #define __SIZEOF_LONG_LONG__ 8
+// RISCV64: #define __SIZEOF_LONG__ 8
+// RISCV64: #define __SIZEOF_POINTER__ 8
+// RISCV64: #define __SIZEOF_PTRDIFF_T__ 8
+// RISCV64: #define __SIZEOF_SHORT__ 2
+// RISCV64: #define __SIZEOF_SIZE_T__ 8
+// RISCV64: #define __SIZEOF_WCHAR_T__ 4
+// RISCV64: #define __SIZEOF_WINT_T__ 4
+// RISCV64: #define __SIZE_MAX__ 18446744073709551615UL
+// RISCV64: #define __SIZE_TYPE__ long unsigned int
+// RISCV64: #define __SIZE_WIDTH__ 64
+// RISCV64: #define __STDC_HOSTED__ 0
+// RISCV64: #define __STDC_UTF_16__ 1
+// RISCV64: #define __STDC_UTF_32__ 1
+// RISCV64: #define __STDC_VERSION__ 201112L
+// RISCV64: #define __STDC__ 1
+// RISCV64: #define __UINT16_C_SUFFIX__
+// RISCV64: #define __UINT16_MAX__ 65535
+// RISCV64: #define __UINT16_TYPE__ unsigned short
+// RISCV64: #define __UINT32_C_SUFFIX__ U
+// RISCV64: #define __UINT32_MAX__ 4294967295U
+// RISCV64: #define __UINT32_TYPE__ unsigned int
+// RISCV64: #define __UINT64_C_SUFFIX__ UL
+// RISCV64: #define __UINT64_MAX__ 18446744073709551615UL
+// RISCV64: #define __UINT64_TYPE__ long unsigned int
+// RISCV64: #define __UINT8_C_SUFFIX__
+// RISCV64: #define __UINT8_MAX__ 255
+// RISCV64: #define __UINT8_TYPE__ unsigned char
+// RISCV64: #define __UINTMAX_C_SUFFIX__ UL
+// RISCV64: #define __UINTMAX_MAX__ 18446744073709551615UL
+// RISCV64: #define __UINTMAX_TYPE__ long unsigned int
+// RISCV64: #define __UINTMAX_WIDTH__ 64
+// RISCV64: #define __UINTPTR_MAX__ 18446744073709551615UL
+// RISCV64: #define __UINTPTR_TYPE__ long unsigned int
+// RISCV64: #define __UINTPTR_WIDTH__ 64
+// TODO: RISC-V GCC defines UINT_FAST16 to be unsigned int
+// RISCV64: #define __UINT_FAST16_MAX__ 65535
+// RISCV64: #define __UINT_FAST16_TYPE__ unsigned short
+// RISCV64: #define __UINT_FAST32_MAX__ 4294967295U
+// RISCV64: #define __UINT_FAST32_TYPE__ unsigned int
+// RISCV64: #define __UINT_FAST64_MAX__ 18446744073709551615UL
+// RISCV64: #define __UINT_FAST64_TYPE__ long unsigned int
+// TODO: RISC-V GCC defines UINT_FAST8 to be unsigned int
+// RISCV64: #define __UINT_FAST8_MAX__ 255
+// RISCV64: #define __UINT_FAST8_TYPE__ unsigned char
+// RISCV64: #define __UINT_LEAST16_MAX__ 65535
+// RISCV64: #define __UINT_LEAST16_TYPE__ unsigned short
+// RISCV64: #define __UINT_LEAST32_MAX__ 4294967295U
+// RISCV64: #define __UINT_LEAST32_TYPE__ unsigned int
+// RISCV64: #define __UINT_LEAST64_MAX__ 18446744073709551615UL
+// RISCV64: #define __UINT_LEAST64_TYPE__ long unsigned int
+// RISCV64: #define __UINT_LEAST8_MAX__ 255
+// RISCV64: #define __UINT_LEAST8_TYPE__ unsigned char
+// RISCV64: #define __USER_LABEL_PREFIX__
+// RISCV64: #define __WCHAR_MAX__ 2147483647
+// RISCV64: #define __WCHAR_TYPE__ int
+// RISCV64: #define __WCHAR_WIDTH__ 32
+// RISCV64: #define __WINT_TYPE__ unsigned int
+// RISCV64: #define __WINT_UNSIGNED__ 1
+// RISCV64: #define __WINT_WIDTH__ 32
+// RISCV64: #define __riscv 1
+// RISCV64: #define __riscv_cmodel_medlow 1
+// RISCV64: #define __riscv_float_abi_soft 1
+// RISCV64: #define __riscv_xlen 64