Update aosp/master LLVM for rebase to r235153

Change-Id: I9bf53792f9fc30570e81a8d80d296c681d005ea7
(cherry picked from commit 0c7f116bb6950ef819323d855415b2f2b0aad987)

15 files changed, 261 insertions, 117 deletions

diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index 2533fa0..228f75e 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -162,7 +162,7 @@ APInt& APInt::operator=(uint64_t RHS) {
   return clearUnusedBits();
 }
 
-/// Profile - This method 'profiles' an APInt for use with FoldingSet.
+/// This method 'profiles' an APInt for use with FoldingSet.
 void APInt::Profile(FoldingSetNodeID& ID) const {
   ID.AddInteger(BitWidth);
 
@@ -176,7 +176,7 @@ void APInt::Profile(FoldingSetNodeID& ID) const {
     ID.AddInteger(pVal[i]);
 }
 
-/// add_1 - This function adds a single "digit" integer, y, to the multiple
+/// This function adds a single "digit" integer, y, to the multiple
 /// "digit" integer array,  x[]. x[] is modified to reflect the addition and
 /// 1 is returned if there is a carry out, otherwise 0 is returned.
 /// @returns the carry of the addition.
@@ -202,7 +202,7 @@ APInt& APInt::operator++() {
   return clearUnusedBits();
 }
 
-/// sub_1 - This function subtracts a single "digit" (64-bit word), y, from
+/// This function subtracts a single "digit" (64-bit word), y, from
 /// the multi-digit integer array, x[], propagating the borrowed 1 value until
 /// no further borrowing is neeeded or it runs out of "digits" in x.  The result
 /// is 1 if "borrowing" exhausted the digits in x, or 0 if x was not exhausted.
@@ -231,7 +231,7 @@ APInt& APInt::operator--() {
   return clearUnusedBits();
 }
 
-/// add - This function adds the integer array x to the integer array Y and
+/// This function adds the integer array x to the integer array Y and
 /// places the result in dest.
 /// @returns the carry out from the addition
 /// @brief General addition of 64-bit integer arrays
@@ -680,12 +680,12 @@ bool APInt::isSplat(unsigned SplatSizeInBits) const {
   return *this == rotl(SplatSizeInBits);
 }
 
-/// HiBits - This function returns the high "numBits" bits of this APInt.
+/// This function returns the high "numBits" bits of this APInt.
 APInt APInt::getHiBits(unsigned numBits) const {
   return APIntOps::lshr(*this, BitWidth - numBits);
 }
 
-/// LoBits - This function returns the low "numBits" bits of this APInt.
+/// This function returns the low "numBits" bits of this APInt.
 APInt APInt::getLoBits(unsigned numBits) const {
   return APIntOps::lshr(APIntOps::shl(*this, BitWidth - numBits),
                         BitWidth - numBits);
@@ -861,7 +861,7 @@ APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
   return isNeg ? -Tmp : Tmp;
 }
 
-/// RoundToDouble - This function converts this APInt to a double.
+/// This function converts this APInt to a double.
 /// The layout for double is as following (IEEE Standard 754):
 ///  --------------------------------------
 /// |  Sign    Exponent    Fraction    Bias |
@@ -2269,9 +2269,8 @@ void APInt::toString(SmallVectorImpl<char> &Str, unsigned Radix,
   std::reverse(Str.begin()+StartDig, Str.end());
 }
 
-/// toString - This returns the APInt as a std::string.  Note that this is an
-/// inefficient method.  It is better to pass in a SmallVector/SmallString
-/// to the methods above.
+/// Returns the APInt as a std::string. Note that this is an inefficient method.
+/// It is better to pass in a SmallVector/SmallString to the methods above.
 std::string APInt::toString(unsigned Radix = 10, bool Signed = true) const {
   SmallString<40> S;
   toString(S, Radix, Signed, /* formatAsCLiteral = */false);
diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index af6c605..3cabc54 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -313,7 +313,7 @@ static Option *LookupNearestOption(StringRef Arg,
         if (RHS.empty() || !PermitValue)
           NearestString = OptionNames[i];
         else
-          NearestString = std::string(OptionNames[i]) + "=" + RHS.str();
+          NearestString = (Twine(OptionNames[i]) + "=" + RHS).str();
       }
     }
   }
@@ -784,7 +784,7 @@ class StrDupSaver : public StringSaver {
   std::vector<char *> Dups;
 
 public:
-  ~StrDupSaver() {
+  ~StrDupSaver() override {
     for (std::vector<char *>::iterator I = Dups.begin(), E = Dups.end(); I != E;
          ++I) {
       char *Dup = *I;
diff --git a/lib/Support/DataStream.cpp b/lib/Support/DataStream.cpp
index a44b958..c243155 100644
--- a/lib/Support/DataStream.cpp
+++ b/lib/Support/DataStream.cpp
@@ -54,9 +54,7 @@ class DataFileStreamer : public DataStreamer {
  int Fd;
 public:
   DataFileStreamer() : Fd(0) {}
-  virtual ~DataFileStreamer() {
-    close(Fd);
-  }
+  ~DataFileStreamer() override { close(Fd); }
   size_t GetBytes(unsigned char *buf, size_t len) override {
     NumStreamFetches++;
     return read(Fd, buf, len);
diff --git a/lib/Support/Debug.cpp b/lib/Support/Debug.cpp
index a88b18e..eb99242 100644
--- a/lib/Support/Debug.cpp
+++ b/lib/Support/Debug.cpp
@@ -114,9 +114,9 @@ static void debug_user_sig_handler(void *Cookie) {
   // know that debug mode is enabled and dbgs() really is a
   // circular_raw_ostream.  If NDEBUG is defined, then dbgs() ==
   // errs() but this will never be invoked.
-  llvm::circular_raw_ostream *dbgout =
-    static_cast<llvm::circular_raw_ostream *>(&llvm::dbgs());
-  dbgout->flushBufferWithBanner();
+  llvm::circular_raw_ostream &dbgout =
+      static_cast<circular_raw_ostream &>(llvm::dbgs());
+  dbgout.flushBufferWithBanner();
 }
 
 /// dbgs - Return a circular-buffered debug stream.
diff --git a/lib/Support/FoldingSet.cpp b/lib/Support/FoldingSet.cpp
index 80d2aef..b8538ff 100644
--- a/lib/Support/FoldingSet.cpp
+++ b/lib/Support/FoldingSet.cpp
@@ -51,8 +51,8 @@ bool FoldingSetNodeIDRef::operator<(FoldingSetNodeIDRef RHS) const {
 ///
 void FoldingSetNodeID::AddPointer(const void *Ptr) {
   // Note: this adds pointers to the hash using sizes and endianness that
-  // depend on the host.  It doesn't matter however, because hashing on
-  // pointer values in inherently unstable.  Nothing  should depend on the 
+  // depend on the host. It doesn't matter, however, because hashing on
+  // pointer values is inherently unstable. Nothing should depend on the
   // ordering of nodes in the folding set.
   Bits.append(reinterpret_cast<unsigned *>(&Ptr),
               reinterpret_cast<unsigned *>(&Ptr+1));
diff --git a/lib/Support/GraphWriter.cpp b/lib/Support/GraphWriter.cpp
index fd4ce54..97aedc8 100644
--- a/lib/Support/GraphWriter.cpp
+++ b/lib/Support/GraphWriter.cpp
@@ -92,7 +92,7 @@ static bool ExecGraphViewer(StringRef ExecPath, std::vector<const char *> &args,
     errs() << " done. \n";
   } else {
     sys::ExecuteNoWait(ExecPath, args.data(), nullptr, nullptr, 0, &ErrMsg);
-    errs() << "Remember to erase graph file: " << Filename.str() << "\n";
+    errs() << "Remember to erase graph file: " << Filename << "\n";
   }
   return false;
 }
@@ -140,6 +140,29 @@ bool llvm::DisplayGraph(StringRef FilenameRef, bool wait,
   std::string ViewerPath;
   GraphSession S;
 
+#ifdef __APPLE__
+  if (S.TryFindProgram("open", ViewerPath)) {
+    std::vector<const char *> args;
+    args.push_back(ViewerPath.c_str());
+    if (wait)
+      args.push_back("-W");
+    args.push_back(Filename.c_str());
+    args.push_back(nullptr);
+    errs() << "Trying 'open' program... ";
+    if (!ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg))
+      return false;
+  }
+#endif
+  if (S.TryFindProgram("xdg-open", ViewerPath)) {
+    std::vector<const char *> args;
+    args.push_back(ViewerPath.c_str());
+    args.push_back(Filename.c_str());
+    args.push_back(nullptr);
+    errs() << "Trying 'xdg-open' program... ";
+    if (!ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg))
+      return false;
+  }
+
   // Graphviz
   if (S.TryFindProgram("Graphviz", ViewerPath)) {
     std::vector<const char *> args;
diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index 0e9a62e..726961a 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -182,19 +182,21 @@ static bool GetX86CpuIDAndInfoEx(unsigned value, unsigned subleaf,
 #endif
 }
 
-static bool OSHasAVXSupport() {
+static bool GetX86XCR0(unsigned *rEAX, unsigned *rEDX) {
 #if defined(__GNUC__)
   // Check xgetbv; this uses a .byte sequence instead of the instruction
   // directly because older assemblers do not include support for xgetbv and
   // there is no easy way to conditionally compile based on the assembler used.
-  int rEAX, rEDX;
-  __asm__ (".byte 0x0f, 0x01, 0xd0" : "=a" (rEAX), "=d" (rEDX) : "c" (0));
+  __asm__ (".byte 0x0f, 0x01, 0xd0" : "=a" (*rEAX), "=d" (*rEDX) : "c" (0));
+  return false;
 #elif defined(_MSC_FULL_VER) && defined(_XCR_XFEATURE_ENABLED_MASK)
-  unsigned long long rEAX = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
+  unsigned long long Result = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
+  *rEAX = Result;
+  *rEDX = Result >> 32;
+  return false;
 #else
-  int rEAX = 0; // Ensures we return false
+  return true;
 #endif
-  return (rEAX & 6) == 6;
 }
 
 static void DetectX86FamilyModel(unsigned EAX, unsigned &Family,
@@ -223,19 +225,30 @@ StringRef sys::getHostCPUName() {
     char     c[12];
   } text;
 
-  GetX86CpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1);
-
-  unsigned MaxLeaf = EAX;
-  bool HasSSE3 = (ECX & 0x1);
-  bool HasSSE41 = (ECX & 0x80000);
-  // If CPUID indicates support for XSAVE, XRESTORE and AVX, and XGETBV 
+  unsigned MaxLeaf;
+  GetX86CpuIDAndInfo(0, &MaxLeaf, text.u+0, text.u+2, text.u+1);
+
+  bool HasMMX   = (EDX >> 23) & 1;
+  bool HasSSE   = (EDX >> 25) & 1;
+  bool HasSSE2  = (EDX >> 26) & 1;
+  bool HasSSE3  = (ECX >>  0) & 1;
+  bool HasSSSE3 = (ECX >>  9) & 1;
+  bool HasSSE41 = (ECX >> 19) & 1;
+  bool HasSSE42 = (ECX >> 20) & 1;
+  bool HasMOVBE = (ECX >> 22) & 1;
+  // If CPUID indicates support for XSAVE, XRESTORE and AVX, and XGETBV
   // indicates that the AVX registers will be saved and restored on context
   // switch, then we have full AVX support.
   const unsigned AVXBits = (1 << 27) | (1 << 28);
-  bool HasAVX = ((ECX & AVXBits) == AVXBits) && OSHasAVXSupport();
-  bool HasAVX2 = HasAVX && MaxLeaf >= 0x7 &&
-                 !GetX86CpuIDAndInfoEx(0x7, 0x0, &EAX, &EBX, &ECX, &EDX) &&
-                 (EBX & 0x20);
+  bool HasAVX = ((ECX & AVXBits) == AVXBits) && !GetX86XCR0(&EAX, &EDX) &&
+                ((EAX & 0x6) == 0x6);
+  bool HasAVX512Save = HasAVX && ((EAX & 0xe0) == 0xe0);
+  bool HasLeaf7 = MaxLeaf >= 0x7 &&
+                  !GetX86CpuIDAndInfoEx(0x7, 0x0, &EAX, &EBX, &ECX, &EDX);
+  bool HasADX = HasLeaf7 && ((EBX >> 19) & 1);
+  bool HasAVX2 = HasAVX && HasLeaf7 && (EBX & 0x20);
+  bool HasAVX512 = HasLeaf7 && HasAVX512Save && ((EBX >> 16) & 1);
+
   GetX86CpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
   bool Em64T = (EDX >> 29) & 0x1;
   bool HasTBM = (ECX >> 21) & 0x1;
@@ -298,6 +311,8 @@ StringRef sys::getHostCPUName() {
       case  9: // Intel Pentium M processor, Intel Celeron M processor model 09.
       case 13: // Intel Pentium M processor, Intel Celeron M processor, model
                // 0Dh. All processors are manufactured using the 90 nm process.
+      case 21: // Intel EP80579 Integrated Processor and Intel EP80579
+               // Integrated Processor with Intel QuickAssist Technology
         return "pentium-m";
 
       case 14: // Intel Core Duo processor, Intel Core Solo processor, model
@@ -313,74 +328,85 @@ StringRef sys::getHostCPUName() {
                // manufactured using the 65 nm process
         return "core2";
 
-      case 21: // Intel EP80579 Integrated Processor and Intel EP80579
-               // Integrated Processor with Intel QuickAssist Technology
-        return "i686"; // FIXME: ???
-
       case 23: // Intel Core 2 Extreme processor, Intel Xeon processor, model
                // 17h. All processors are manufactured using the 45 nm process.
                //
                // 45nm: Penryn , Wolfdale, Yorkfield (XE)
-        // Not all Penryn processors support SSE 4.1 (such as the Pentium brand)
-        return HasSSE41 ? "penryn" : "core2";
+      case 29: // Intel Xeon processor MP. All processors are manufactured using
+               // the 45 nm process.
+        return "penryn";
 
       case 26: // Intel Core i7 processor and Intel Xeon processor. All
                // processors are manufactured using the 45 nm process.
-      case 29: // Intel Xeon processor MP. All processors are manufactured using
-               // the 45 nm process.
       case 30: // Intel(R) Core(TM) i7 CPU         870  @ 2.93GHz.
                // As found in a Summer 2010 model iMac.
+      case 46: // Nehalem EX
+        return "nehalem";
       case 37: // Intel Core i7, laptop version.
       case 44: // Intel Core i7 processor and Intel Xeon processor. All
                // processors are manufactured using the 32 nm process.
-      case 46: // Nehalem EX
       case 47: // Westmere EX
-        return "corei7";
+        return "westmere";
 
       // SandyBridge:
       case 42: // Intel Core i7 processor. All processors are manufactured
                // using the 32 nm process.
       case 45:
-        // Not all Sandy Bridge processors support AVX (such as the Pentium
-        // versions instead of the i7 versions).
-        return HasAVX ? "corei7-avx" : "corei7";
+        return "sandybridge";
 
       // Ivy Bridge:
       case 58:
       case 62: // Ivy Bridge EP
-        // Not all Ivy Bridge processors support AVX (such as the Pentium
-        // versions instead of the i7 versions).
-        return HasAVX ? "core-avx-i" : "corei7";
+        return "ivybridge";
 
       // Haswell:
       case 60:
       case 63:
       case 69:
       case 70:
-        // Not all Haswell processors support AVX2 (such as the Pentium
-        // versions instead of the i7 versions).
-        return HasAVX2 ? "core-avx2" : "corei7";
+        return "haswell";
 
       // Broadwell:
       case 61:
-        // Not all Broadwell processors support AVX2 (such as the Pentium
-        // versions instead of the i7 versions).
-        return HasAVX2 ? "broadwell" : "corei7";
+        return "broadwell";
 
       case 28: // Most 45 nm Intel Atom processors
       case 38: // 45 nm Atom Lincroft
       case 39: // 32 nm Atom Medfield
       case 53: // 32 nm Atom Midview
       case 54: // 32 nm Atom Midview
-        return "atom";
+        return "bonnell";
 
       // Atom Silvermont codes from the Intel software optimization guide.
       case 55:
       case 74:
       case 77:
-        return "slm";
-
-      default: return (Em64T) ? "x86-64" : "i686";
+        return "silvermont";
+
+      default: // Unknown family 6 CPU, try to guess.
+        if (HasAVX512)
+          return "knl";
+        if (HasADX)
+          return "broadwell";
+        if (HasAVX2)
+          return "haswell";
+        if (HasAVX)
+          return "sandybridge";
+        if (HasSSE42)
+          return HasMOVBE ? "silvermont" : "nehalem";
+        if (HasSSE41)
+          return "penryn";
+        if (HasSSSE3)
+          return HasMOVBE ? "bonnell" : "core2";
+        if (Em64T)
+          return "x86-64";
+        if (HasSSE2)
+          return "pentium-m";
+        if (HasSSE)
+          return "pentium3";
+        if (HasMMX)
+          return "pentium2";
+        return "pentiumpro";
       }
     case 15: {
       switch (Model) {
@@ -681,7 +707,89 @@ StringRef sys::getHostCPUName() {
 }
 #endif
 
-#if defined(__linux__) && (defined(__arm__) || defined(__aarch64__))
+#if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)\
+ || defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
+bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
+  unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
+  unsigned MaxLevel;
+  union {
+    unsigned u[3];
+    char     c[12];
+  } text;
+
+  if (GetX86CpuIDAndInfo(0, &MaxLevel, text.u+0, text.u+2, text.u+1) ||
+      MaxLevel < 1)
+    return false;
+
+  GetX86CpuIDAndInfo(1, &EAX, &EBX, &ECX, &EDX);
+
+  Features["cmov"]   = (EDX >> 15) & 1;
+  Features["mmx"]    = (EDX >> 23) & 1;
+  Features["sse"]    = (EDX >> 25) & 1;
+  Features["sse2"]   = (EDX >> 26) & 1;
+  Features["sse3"]   = (ECX >>  0) & 1;
+  Features["ssse3"]  = (ECX >>  9) & 1;
+  Features["sse4.1"] = (ECX >> 19) & 1;
+  Features["sse4.2"] = (ECX >> 20) & 1;
+
+  Features["pclmul"] = (ECX >>  1) & 1;
+  Features["cx16"]   = (ECX >> 13) & 1;
+  Features["movbe"]  = (ECX >> 22) & 1;
+  Features["popcnt"] = (ECX >> 23) & 1;
+  Features["aes"]    = (ECX >> 25) & 1;
+  Features["rdrnd"]  = (ECX >> 30) & 1;
+
+  // If CPUID indicates support for XSAVE, XRESTORE and AVX, and XGETBV
+  // indicates that the AVX registers will be saved and restored on context
+  // switch, then we have full AVX support.
+  bool HasAVX = ((ECX >> 27) & 1) && ((ECX >> 28) & 1) &&
+                !GetX86XCR0(&EAX, &EDX) && ((EAX & 0x6) == 0x6);
+  Features["avx"]    = HasAVX;
+  Features["fma"]    = HasAVX && (ECX >> 12) & 1;
+  Features["f16c"]   = HasAVX && (ECX >> 29) & 1;
+
+  // AVX512 requires additional context to be saved by the OS.
+  bool HasAVX512Save = HasAVX && ((EAX & 0xe0) == 0xe0);
+
+  unsigned MaxExtLevel;
+  GetX86CpuIDAndInfo(0x80000000, &MaxExtLevel, &EBX, &ECX, &EDX);
+
+  bool HasExtLeaf1 = MaxExtLevel >= 0x80000001 &&
+                     !GetX86CpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
+  Features["lzcnt"]  = HasExtLeaf1 && ((ECX >>  5) & 1);
+  Features["sse4a"]  = HasExtLeaf1 && ((ECX >>  6) & 1);
+  Features["prfchw"] = HasExtLeaf1 && ((ECX >>  8) & 1);
+  Features["xop"]    = HasAVX && HasExtLeaf1 && ((ECX >> 11) & 1);
+  Features["fma4"]   = HasAVX && HasExtLeaf1 && ((ECX >> 16) & 1);
+  Features["tbm"]    = HasExtLeaf1 && ((ECX >> 21) & 1);
+
+  bool HasLeaf7 = MaxLevel >= 7 &&
+                  !GetX86CpuIDAndInfoEx(0x7, 0x0, &EAX, &EBX, &ECX, &EDX);
+
+  // AVX2 is only supported if we have the OS save support from AVX.
+  Features["avx2"]     = HasAVX && HasLeaf7 && (EBX >>  5) & 1;
+
+  Features["fsgsbase"] = HasLeaf7 && ((EBX >>  0) & 1);
+  Features["bmi"]      = HasLeaf7 && ((EBX >>  3) & 1);
+  Features["hle"]      = HasLeaf7 && ((EBX >>  4) & 1);
+  Features["bmi2"]     = HasLeaf7 && ((EBX >>  8) & 1);
+  Features["rtm"]      = HasLeaf7 && ((EBX >> 11) & 1);
+  Features["rdseed"]   = HasLeaf7 && ((EBX >> 18) & 1);
+  Features["adx"]      = HasLeaf7 && ((EBX >> 19) & 1);
+  Features["sha"]      = HasLeaf7 && ((EBX >> 29) & 1);
+
+  // AVX512 is only supported if the OS supports the context save for it.
+  Features["avx512f"]  = HasLeaf7 && ((EBX >> 16) & 1) && HasAVX512Save;
+  Features["avx512dq"] = HasLeaf7 && ((EBX >> 17) & 1) && HasAVX512Save;
+  Features["avx512pf"] = HasLeaf7 && ((EBX >> 26) & 1) && HasAVX512Save;
+  Features["avx512er"] = HasLeaf7 && ((EBX >> 27) & 1) && HasAVX512Save;
+  Features["avx512cd"] = HasLeaf7 && ((EBX >> 28) & 1) && HasAVX512Save;
+  Features["avx512bw"] = HasLeaf7 && ((EBX >> 30) & 1) && HasAVX512Save;
+  Features["avx512vl"] = HasLeaf7 && ((EBX >> 31) & 1) && HasAVX512Save;
+
+  return true;
+}
+#elif defined(__linux__) && (defined(__arm__) || defined(__aarch64__))
 bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
   // Read 1024 bytes from /proc/cpuinfo, which should contain the Features line
   // in all cases.
diff --git a/lib/Support/Process.cpp b/lib/Support/Process.cpp
index d0c1748..3571cd3 100644
--- a/lib/Support/Process.cpp
+++ b/lib/Support/Process.cpp
@@ -26,24 +26,6 @@ using namespace sys;
 //===          independent code.
 //===----------------------------------------------------------------------===//
 
-/// \brief A helper function to compute the elapsed wall-time since the program
-/// started.
-///
-/// Note that this routine actually computes the elapsed wall time since the
-/// first time it was called. However, we arrange to have it called during the
-/// startup of the process to get approximately correct results.
-static TimeValue getElapsedWallTime() {
-  static TimeValue &StartTime = *new TimeValue(TimeValue::now());
-  return TimeValue::now() - StartTime;
-}
-
-/// \brief A special global variable to ensure we call \c getElapsedWallTime
-/// during global initialization of the program.
-///
-/// Note that this variable is never referenced elsewhere. Doing so could
-/// create race conditions during program startup or shutdown.
-static volatile TimeValue DummyTimeValue = getElapsedWallTime();
-
 Optional<std::string> Process::FindInEnvPath(const std::string& EnvName,
                                              const std::string& FileName)
 {
diff --git a/lib/Support/Regex.cpp b/lib/Support/Regex.cpp
index d3e29ac..e8344ef 100644
--- a/lib/Support/Regex.cpp
+++ b/lib/Support/Regex.cpp
@@ -15,6 +15,7 @@
 #include "regex_impl.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
 #include <string>
 using namespace llvm;
 
@@ -158,7 +159,7 @@ std::string Regex::sub(StringRef Repl, StringRef String,
           RefValue < Matches.size())
         Res += Matches[RefValue];
       else if (Error && Error->empty())
-        *Error = "invalid backreference string '" + Ref.str() + "'";
+        *Error = ("invalid backreference string '" + Twine(Ref) + "'").str();
       break;
     }
     }
diff --git a/lib/Support/Triple.cpp b/lib/Support/Triple.cpp
index d4b150a..5b43ecc 100644
--- a/lib/Support/Triple.cpp
+++ b/lib/Support/Triple.cpp
@@ -92,7 +92,7 @@ const char *Triple::getArchTypePrefix(ArchType Kind) {
   case sparcv9:
   case sparc:       return "sparc";
 
-  case systemz:     return "systemz";
+  case systemz:     return "s390";
 
   case x86:
   case x86_64:      return "x86";
@@ -1111,7 +1111,7 @@ const char *Triple::getARMCPUForArch(StringRef MArch) const {
       .Cases("v7m", "v7-m", "cortex-m3")
       .Cases("v7em", "v7e-m", "cortex-m4")
       .Cases("v8", "v8a", "v8-a", "cortex-a53")
-      .Cases("v8.1a", "v8.1-a", "generic-armv8.1-a")
+      .Cases("v8.1a", "v8.1-a", "generic")
       .Default(nullptr);
   else
     result = llvm::StringSwitch<const char *>(MArch)
diff --git a/lib/Support/Unix/Signals.inc b/lib/Support/Unix/Signals.inc
index a9b48e0..057bcab1 100644
--- a/lib/Support/Unix/Signals.inc
+++ b/lib/Support/Unix/Signals.inc
@@ -486,12 +486,12 @@ void llvm::sys::DisableSystemDialogsOnCrash() {}
 
 /// PrintStackTraceOnErrorSignal - When an error signal (such as SIGABRT or
 /// SIGSEGV) is delivered to the process, print a stack trace and then exit.
-void llvm::sys::PrintStackTraceOnErrorSignal() {
+void llvm::sys::PrintStackTraceOnErrorSignal(bool DisableCrashReporting) {
   AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
 
 #if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
   // Environment variable to disable any kind of crash dialog.
-  if (getenv("LLVM_DISABLE_CRASH_REPORT")) {
+  if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
     mach_port_t self = mach_task_self();
 
     exception_mask_t mask = EXC_MASK_CRASH;
diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc
index d558ff5..b5523aa 100644
--- a/lib/Support/Windows/Path.inc
+++ b/lib/Support/Windows/Path.inc
@@ -261,6 +261,7 @@ std::error_code rename(const Twine &from, const Twine &to) {
                       MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
       return std::error_code();
     DWORD LastError = ::GetLastError();
+    ec = windows_error(LastError);
     if (LastError != ERROR_ACCESS_DENIED)
       break;
     // Retry MoveFile() at ACCESS_DENIED.
diff --git a/lib/Support/Windows/Signals.inc b/lib/Support/Windows/Signals.inc
index de6bf1c..f070111 100644
--- a/lib/Support/Windows/Signals.inc
+++ b/lib/Support/Windows/Signals.inc
@@ -389,7 +389,7 @@ void sys::DisableSystemDialogsOnCrash() {
 
 /// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
 /// SIGSEGV) is delivered to the process, print a stack trace and then exit.
-void sys::PrintStackTraceOnErrorSignal() {
+void sys::PrintStackTraceOnErrorSignal(bool DisableCrashReporting) {
   DisableSystemDialogsOnCrash();
   RegisterHandler();
   LeaveCriticalSection(&CriticalSection);
diff --git a/lib/Support/Windows/TimeValue.inc b/lib/Support/Windows/TimeValue.inc
index 0223ab4..b90b4f1 100644
--- a/lib/Support/Windows/TimeValue.inc
+++ b/lib/Support/Windows/TimeValue.inc
@@ -47,6 +47,7 @@ std::string TimeValue::str() const {
   __time64_t OurTime = this->toEpochTime();
   int Error = ::_localtime64_s(&Storage, &OurTime);
   assert(!Error);
+  (void)Error;
   LT = &Storage;
 #endif
 
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 051e2dd..6f9f910 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -487,51 +487,53 @@ void format_object_base::home() {
 //  raw_fd_ostream
 //===----------------------------------------------------------------------===//
 
-raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC,
-                               sys::fs::OpenFlags Flags)
-    : Error(false), UseAtomicWrites(false), pos(0) {
-  EC = std::error_code();
+static int getFD(StringRef Filename, std::error_code &EC,
+                 sys::fs::OpenFlags Flags) {
   // Handle "-" as stdout. Note that when we do this, we consider ourself
   // the owner of stdout. This means that we can do things like close the
   // file descriptor when we're done and set the "binary" flag globally.
   if (Filename == "-") {
-    FD = STDOUT_FILENO;
+    EC = std::error_code();
     // If user requested binary then put stdout into binary mode if
     // possible.
     if (!(Flags & sys::fs::F_Text))
       sys::ChangeStdoutToBinary();
-    // Close stdout when we're done, to detect any output errors.
-    ShouldClose = true;
-    return;
+    return STDOUT_FILENO;
   }
 
+  int FD;
   EC = sys::fs::openFileForWrite(Filename, FD, Flags);
+  if (EC)
+    return -1;
 
-  if (EC) {
-    ShouldClose = false;
-    return;
-  }
-
-  // Ok, we successfully opened the file, so it'll need to be closed.
-  ShouldClose = true;
+  return FD;
 }
 
-/// raw_fd_ostream ctor - FD is the file descriptor that this writes to.  If
-/// ShouldClose is true, this closes the file when the stream is destroyed.
+raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC,
+                               sys::fs::OpenFlags Flags)
+    : raw_fd_ostream(getFD(Filename, EC, Flags), true) {}
+
+/// FD is the file descriptor that this writes to.  If ShouldClose is true, this
+/// closes the file when the stream is destroyed.
 raw_fd_ostream::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered)
-  : raw_ostream(unbuffered), FD(fd),
-    ShouldClose(shouldClose), Error(false), UseAtomicWrites(false) {
-#ifdef O_BINARY
-  // Setting STDOUT to binary mode is necessary in Win32
-  // to avoid undesirable linefeed conversion.
-  // Don't touch STDERR, or w*printf() (in assert()) would barf wide chars.
-  if (fd == STDOUT_FILENO)
-    setmode(fd, O_BINARY);
-#endif
+    : raw_pwrite_stream(unbuffered), FD(fd), ShouldClose(shouldClose),
+      Error(false), UseAtomicWrites(false) {
+  if (FD < 0 ) {
+    ShouldClose = false;
+    return;
+  }
 
   // Get the starting position.
   off_t loc = ::lseek(FD, 0, SEEK_CUR);
-  if (loc == (off_t)-1)
+#ifdef LLVM_ON_WIN32
+  // MSVCRT's _lseek(SEEK_CUR) doesn't return -1 for pipes.
+  sys::fs::file_status Status;
+  std::error_code EC = status(FD, Status);
+  SupportsSeeking = !EC && Status.type() == sys::fs::file_type::regular_file;
+#else
+  SupportsSeeking = loc != (off_t)-1;
+#endif
+  if (!SupportsSeeking)
     pos = 0;
   else
     pos = static_cast<uint64_t>(loc);
@@ -623,11 +625,18 @@ void raw_fd_ostream::close() {
 uint64_t raw_fd_ostream::seek(uint64_t off) {
   flush();
   pos = ::lseek(FD, off, SEEK_SET);
-  if (pos != off)
+  if (pos == (uint64_t)-1)
     error_detected();
   return pos;
 }
 
+void raw_fd_ostream::pwrite(const char *Ptr, size_t Size, uint64_t Offset) {
+  uint64_t Pos = tell();
+  seek(Offset);
+  write(Ptr, Size);
+  seek(Pos);
+}
+
 size_t raw_fd_ostream::preferred_buffer_size() const {
 #if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(__minix)
   // Windows and Minix have no st_blksize.
@@ -708,7 +717,9 @@ raw_ostream &llvm::outs() {
   // Set buffer settings to model stdout behavior.
   // Delete the file descriptor when the program exits, forcing error
   // detection. If you don't want this behavior, don't use outs().
-  static raw_fd_ostream S(STDOUT_FILENO, true);
+  std::error_code EC;
+  static raw_fd_ostream S("-", EC, sys::fs::F_None);
+  assert(!EC);
   return S;
 }
 
@@ -749,7 +760,14 @@ void raw_string_ostream::write_impl(const char *Ptr, size_t Size) {
 // capacity. This allows raw_ostream to write directly into the correct place,
 // and we only need to set the vector size when the data is flushed.
 
+raw_svector_ostream::raw_svector_ostream(SmallVectorImpl<char> &O, unsigned)
+    : OS(O) {}
+
 raw_svector_ostream::raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {
+  init();
+}
+
+void raw_svector_ostream::init() {
   // Set up the initial external buffer. We make sure that the buffer has at
   // least 128 bytes free; raw_ostream itself only requires 64, but we want to
   // make sure that we don't grow the buffer unnecessarily on destruction (when
@@ -763,6 +781,17 @@ raw_svector_ostream::~raw_svector_ostream() {
   flush();
 }
 
+void raw_svector_ostream::pwrite(const char *Ptr, size_t Size,
+                                 uint64_t Offset) {
+  flush();
+
+  uint64_t End = Offset + Size;
+  if (End > OS.size())
+    OS.resize(End);
+
+  memcpy(OS.begin() + Offset, Ptr, Size);
+}
+
 /// resync - This is called when the SmallVector we're appending to is changed
 /// outside of the raw_svector_ostream's control.  It is only safe to do this
 /// if the raw_svector_ostream has previously been flushed.
@@ -817,3 +846,5 @@ void raw_null_ostream::write_impl(const char *Ptr, size_t Size) {
 uint64_t raw_null_ostream::current_pos() const {
   return 0;
 }
+
+void raw_null_ostream::pwrite(const char *Ptr, size_t Size, uint64_t Offset) {}