Index: include/llvm/Support/AArch64TargetParser.def
===================================================================
--- include/llvm/Support/AArch64TargetParser.def
+++ include/llvm/Support/AArch64TargetParser.def
@@ -43,8 +43,9 @@
 AARCH64_ARCH_EXT_NAME("fp",       AArch64::AEK_FP,       "+fp-armv8",  "-fp-armv8")
 AARCH64_ARCH_EXT_NAME("simd",     AArch64::AEK_SIMD,     "+neon",  "-neon")
 AARCH64_ARCH_EXT_NAME("fp16",     AArch64::AEK_FP16,     "+fullfp16",  "-fullfp16")
-AARCH64_ARCH_EXT_NAME("profile",     AArch64::AEK_PROFILE,     "+spe",  "-spe")
-AARCH64_ARCH_EXT_NAME("ras",     AArch64::AEK_RAS,     "+ras",  "-ras")
+AARCH64_ARCH_EXT_NAME("profile",  AArch64::AEK_PROFILE,  "+spe",  "-spe")
+AARCH64_ARCH_EXT_NAME("ras",      AArch64::AEK_RAS,      "+ras",  "-ras")
+AARCH64_ARCH_EXT_NAME("sve",      AArch64::AEK_SVE,      "+sve",  "-sve")
 #undef AARCH64_ARCH_EXT_NAME
 
 #ifndef AARCH64_CPU_NAME
Index: include/llvm/Support/TargetParser.h
===================================================================
--- include/llvm/Support/TargetParser.h
+++ include/llvm/Support/TargetParser.h
@@ -85,6 +85,7 @@
   AEK_DSP = 0x400,
   AEK_FP16 = 0x800,
   AEK_RAS = 0x1000,
+  AEK_SVE = 0x2000,
   // Unsupported extensions.
   AEK_OS = 0x8000000,
   AEK_IWMMXT = 0x10000000,
@@ -166,7 +167,8 @@
   AEK_FP16 = 0x20,
   AEK_PROFILE = 0x40,
   AEK_RAS = 0x80,
-  AEK_LSE = 0x100
+  AEK_LSE = 0x100,
+  AEK_SVE = 0x200
 };
 
 StringRef getCanonicalArchName(StringRef Arch);
Index: lib/Support/TargetParser.cpp
===================================================================
--- lib/Support/TargetParser.cpp
+++ lib/Support/TargetParser.cpp
@@ -452,6 +452,8 @@
     Features.push_back("+ras");
   if (Extensions & AArch64::AEK_LSE)
     Features.push_back("+lse");
+  if (Extensions & AArch64::AEK_SVE)
+    Features.push_back("+sve");
 
   return true;
 }
Index: lib/Target/AArch64/AArch64.td
===================================================================
--- lib/Target/AArch64/AArch64.td
+++ lib/Target/AArch64/AArch64.td
@@ -50,6 +50,9 @@
 def FeatureSPE : SubtargetFeature<"spe", "HasSPE", "true",
   "Enable Statistical Profiling extension">;
 
+def FeatureSVE : SubtargetFeature<"sve", "HasSVE", "true",
+  "Enable Scalable Vector Extension (SVE) instructions">;
+
 /// Cyclone has register move instructions which are "free".
 def FeatureZCRegMove : SubtargetFeature<"zcm", "HasZeroCycleRegMove", "true",
                                         "Has zero-cycle register moves">;
Index: lib/Target/AArch64/AArch64InstrInfo.td
===================================================================
--- lib/Target/AArch64/AArch64InstrInfo.td
+++ lib/Target/AArch64/AArch64InstrInfo.td
@@ -37,6 +37,8 @@
                                  AssemblerPredicate<"FeatureFullFP16", "fullfp16">;
 def HasSPE           : Predicate<"Subtarget->hasSPE()">,
                                  AssemblerPredicate<"FeatureSPE", "spe">;
+def HasSVE           : Predicate<"Subtarget->hasSVE()">,
+                                 AssemblerPredicate<"FeatureSVE", "sve">;
 
 def IsLE             : Predicate<"Subtarget->isLittleEndian()">;
 def IsBE             : Predicate<"!Subtarget->isLittleEndian()">;
Index: lib/Target/AArch64/AArch64Subtarget.h
===================================================================
--- lib/Target/AArch64/AArch64Subtarget.h
+++ lib/Target/AArch64/AArch64Subtarget.h
@@ -70,6 +70,7 @@
   bool HasFullFP16 = false;
   bool HasSPE = false;
   bool HasLSLFast = false;
+  bool HasSVE = false;
 
   // HasZeroCycleRegMove - Has zero-cycle register mov instructions.
   bool HasZeroCycleRegMove = false;
@@ -244,6 +245,7 @@
   bool hasFullFP16() const { return HasFullFP16; }
   bool hasSPE() const { return HasSPE; }
   bool hasLSLFast() const { return HasLSLFast; }
+  bool hasSVE() const { return HasSVE; }
 
   bool isLittleEndian() const { return IsLittle; }
 
Index: unittests/Support/TargetParserTest.cpp
===================================================================
--- unittests/Support/TargetParserTest.cpp
+++ unittests/Support/TargetParserTest.cpp
@@ -737,7 +737,7 @@
   unsigned Extensions = AArch64::AEK_CRC | AArch64::AEK_CRYPTO |
                         AArch64::AEK_FP | AArch64::AEK_SIMD |
                         AArch64::AEK_FP16 | AArch64::AEK_PROFILE |
-                        AArch64::AEK_RAS;
+                        AArch64::AEK_RAS | AArch64::AEK_SVE;
 
   for (unsigned i = 0; i <= Extensions; i++)
     EXPECT_TRUE(i == 0 ? !AArch64::getExtensionFeatures(i, Features)
@@ -762,7 +762,8 @@
                               {"simd", "nosimd", "+neon", "-neon"},
                               {"fp16", "nofp16", "+fullfp16", "-fullfp16"},
                               {"profile", "noprofile", "+spe", "-spe"},
-                              {"ras", "noras", "+ras", "-ras"}};
+                              {"ras", "noras", "+ras", "-ras"},
+                              {"sve", "nosve", "+sve", "-sve"}};
 
   for (unsigned i = 0; i < array_lengthof(ArchExt); i++) {
     EXPECT_EQ(StringRef(ArchExt[i][2]),