Index: llvm/include/llvm/ADT/Triple.h
===================================================================
--- llvm/include/llvm/ADT/Triple.h
+++ llvm/include/llvm/ADT/Triple.h
@@ -56,6 +56,7 @@
     avr,            // AVR: Atmel AVR microcontroller
     bpfel,          // eBPF or extended BPF or 64-bit BPF (little endian)
     bpfeb,          // eBPF or extended BPF or 64-bit BPF (big endian)
+    csky,           // CSKY: csky
     hexagon,        // Hexagon: hexagon
     mips,           // MIPS: mips, mipsallegrex, mipsr6
     mipsel,         // MIPSEL: mipsel, mipsallegrexe, mipsr6el
@@ -755,6 +756,11 @@
     return getArch() == Triple::wasm32 || getArch() == Triple::wasm64;
   }
 
+  // Tests whether the target is CSKY
+  bool isCSKY() const {
+    return getArch() == Triple::csky;
+  }
+
   /// Tests whether the target supports comdat
   bool supportsCOMDAT() const {
     return !(isOSBinFormatMachO() || isOSBinFormatXCOFF());
Index: llvm/lib/Support/Triple.cpp
===================================================================
--- llvm/lib/Support/Triple.cpp
+++ llvm/lib/Support/Triple.cpp
@@ -36,6 +36,7 @@
   case avr:            return "avr";
   case bpfeb:          return "bpfeb";
   case bpfel:          return "bpfel";
+  case csky:           return "csky";
   case hexagon:        return "hexagon";
   case hsail64:        return "hsail64";
   case hsail:          return "hsail";
@@ -151,6 +152,7 @@
   case riscv64:     return "riscv";
 
   case ve:          return "ve";
+  case csky:        return "csky";
   }
 }
 
@@ -319,6 +321,7 @@
     .Case("renderscript32", renderscript32)
     .Case("renderscript64", renderscript64)
     .Case("ve", ve)
+    .Case("csky", csky)
     .Default(UnknownArch);
 }
 
@@ -448,6 +451,7 @@
     .Case("ve", Triple::ve)
     .Case("wasm32", Triple::wasm32)
     .Case("wasm64", Triple::wasm64)
+    .Case("csky", Triple::csky)
     .Default(Triple::UnknownArch);
 
   // Some architectures require special parsing logic just to compute the
@@ -678,6 +682,7 @@
   case Triple::avr:
   case Triple::bpfeb:
   case Triple::bpfel:
+  case Triple::csky:
   case Triple::hexagon:
   case Triple::hsail64:
   case Triple::hsail:
@@ -1251,6 +1256,7 @@
   case llvm::Triple::arc:
   case llvm::Triple::arm:
   case llvm::Triple::armeb:
+  case llvm::Triple::csky:
   case llvm::Triple::hexagon:
   case llvm::Triple::hsail:
   case llvm::Triple::kalimba:
@@ -1334,6 +1340,7 @@
   case Triple::arc:
   case Triple::arm:
   case Triple::armeb:
+  case Triple::csky:
   case Triple::hexagon:
   case Triple::hsail:
   case Triple::kalimba:
@@ -1385,6 +1392,7 @@
   case Triple::UnknownArch:
   case Triple::arc:
   case Triple::avr:
+  case Triple::csky:
   case Triple::hexagon:
   case Triple::kalimba:
   case Triple::lanai:
@@ -1478,6 +1486,7 @@
   case Triple::x86_64:
   case Triple::xcore:
   case Triple::ve:
+  case Triple::csky:
 
   // ARM is intentionally unsupported here, changing the architecture would
   // drop any arch suffixes.
@@ -1541,6 +1550,7 @@
   case Triple::arm:
   case Triple::avr:
   case Triple::bpfel:
+  case Triple::csky:
   case Triple::hexagon:
   case Triple::hsail64:
   case Triple::hsail:
Index: llvm/unittests/ADT/TripleTest.cpp
===================================================================
--- llvm/unittests/ADT/TripleTest.cpp
+++ llvm/unittests/ADT/TripleTest.cpp
@@ -303,6 +303,18 @@
   EXPECT_EQ(Triple::Linux, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
+  T = Triple("csky-unknown-unknown");
+  EXPECT_EQ(Triple::csky, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::UnknownOS, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
+  T = Triple("csky-unknown-linux");
+  EXPECT_EQ(Triple::csky, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
   T = Triple("riscv32-unknown-unknown");
   EXPECT_EQ(Triple::riscv32, T.getArch());
   EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
@@ -882,6 +894,12 @@
   EXPECT_FALSE(T.isArch32Bit());
   EXPECT_TRUE(T.isArch64Bit());
   EXPECT_TRUE(T.isRISCV());
+
+  T.setArch(Triple::csky);
+  EXPECT_FALSE(T.isArch16Bit());
+  EXPECT_TRUE(T.isArch32Bit());
+  EXPECT_FALSE(T.isArch64Bit());
+  EXPECT_TRUE(T.isCSKY());
 }
 
 TEST(TripleTest, BitWidthArchVariants) {
@@ -981,6 +999,10 @@
   EXPECT_EQ(Triple::riscv32, T.get32BitArchVariant().getArch());
   EXPECT_EQ(Triple::riscv64, T.get64BitArchVariant().getArch());
 
+  T.setArch(Triple::csky);
+  EXPECT_EQ(Triple::csky, T.get32BitArchVariant().getArch());
+  EXPECT_EQ(Triple::UnknownArch, T.get64BitArchVariant().getArch());
+
   T.setArch(Triple::thumbeb);
   EXPECT_EQ(Triple::thumbeb, T.get32BitArchVariant().getArch());
   EXPECT_EQ(Triple::aarch64_be, T.get64BitArchVariant().getArch());
@@ -1134,6 +1156,10 @@
   T.setArch(Triple::le64);
   EXPECT_EQ(Triple::UnknownArch, T.getBigEndianArchVariant().getArch());
   EXPECT_EQ(Triple::le64, T.getLittleEndianArchVariant().getArch());
+
+  T.setArch(Triple::csky);
+  EXPECT_EQ(Triple::UnknownArch, T.getBigEndianArchVariant().getArch());
+  EXPECT_EQ(Triple::csky, T.getLittleEndianArchVariant().getArch());
 }
 
 TEST(TripleTest, getOSVersion) {
@@ -1360,6 +1386,9 @@
   EXPECT_EQ(Triple::XCOFF, Triple("powerpc---xcoff").getObjectFormat());
   EXPECT_EQ(Triple::XCOFF, Triple("powerpc64---xcoff").getObjectFormat());
 
+  EXPECT_EQ(Triple::ELF, Triple("csky-unknown-unknown").getObjectFormat());
+  EXPECT_EQ(Triple::ELF, Triple("csky-unknown-linux").getObjectFormat());
+
   Triple MSVCNormalized(Triple::normalize("i686-pc-windows-msvc-elf"));
   EXPECT_EQ(Triple::ELF, MSVCNormalized.getObjectFormat());