Index: llvm/trunk/lib/Target/AArch64/AArch64SystemOperands.td
===================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64SystemOperands.td
+++ llvm/trunk/lib/Target/AArch64/AArch64SystemOperands.td
@@ -175,6 +175,35 @@
 def : PRFM<"pstl3strm", 0x15>;
 
 //===----------------------------------------------------------------------===//
+// SVE Prefetch instruction options.
+//===----------------------------------------------------------------------===//
+
+class SVEPRFM<string name, bits<4> encoding> : SearchableTable {
+  let SearchableFields = ["Name", "Encoding"];
+  let EnumValueField = "Encoding";
+
+  string Name = name;
+  bits<4> Encoding;
+  let Encoding = encoding;
+  code Requires = [{ {} }];
+}
+
+let Requires = [{ {AArch64::FeatureSVE} }] in {
+def : SVEPRFM<"pldl1keep", 0x00>;
+def : SVEPRFM<"pldl1strm", 0x01>;
+def : SVEPRFM<"pldl2keep", 0x02>;
+def : SVEPRFM<"pldl2strm", 0x03>;
+def : SVEPRFM<"pldl3keep", 0x04>;
+def : SVEPRFM<"pldl3strm", 0x05>;
+def : SVEPRFM<"pstl1keep", 0x08>;
+def : SVEPRFM<"pstl1strm", 0x09>;
+def : SVEPRFM<"pstl2keep", 0x0a>;
+def : SVEPRFM<"pstl2strm", 0x0b>;
+def : SVEPRFM<"pstl3keep", 0x0c>;
+def : SVEPRFM<"pstl3strm", 0x0d>;
+}
+
+//===----------------------------------------------------------------------===//
 // SVE Predicate patterns
 //===----------------------------------------------------------------------===//
 
Index: llvm/trunk/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
===================================================================
--- llvm/trunk/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ llvm/trunk/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -128,6 +128,7 @@
   OperandMatchResultTy tryParseMRSSystemRegister(OperandVector &Operands);
   OperandMatchResultTy tryParseSysReg(OperandVector &Operands);
   OperandMatchResultTy tryParseSysCROperand(OperandVector &Operands);
+  template <bool IsSVEPrefetch = false>
   OperandMatchResultTy tryParsePrefetch(OperandVector &Operands);
   OperandMatchResultTy tryParsePSBHint(OperandVector &Operands);
   OperandMatchResultTy tryParseAdrpLabel(OperandVector &Operands);
@@ -2033,11 +2034,32 @@
 }
 
 /// tryParsePrefetch - Try to parse a prefetch operand.
+template <bool IsSVEPrefetch>
 OperandMatchResultTy
 AArch64AsmParser::tryParsePrefetch(OperandVector &Operands) {
   MCAsmParser &Parser = getParser();
   SMLoc S = getLoc();
   const AsmToken &Tok = Parser.getTok();
+
+  auto LookupByName = [](StringRef N) {
+    if (IsSVEPrefetch) {
+      if (auto Res = AArch64SVEPRFM::lookupSVEPRFMByName(N))
+        return Optional<unsigned>(Res->Encoding);
+    } else if (auto Res = AArch64PRFM::lookupPRFMByName(N))
+      return Optional<unsigned>(Res->Encoding);
+    return Optional<unsigned>();
+  };
+
+  auto LookupByEncoding = [](unsigned E) {
+    if (IsSVEPrefetch) {
+      if (auto Res = AArch64SVEPRFM::lookupSVEPRFMByEncoding(E))
+        return Optional<StringRef>(Res->Name);
+    } else if (auto Res = AArch64PRFM::lookupPRFMByEncoding(E))
+      return Optional<StringRef>(Res->Name);
+    return Optional<StringRef>();
+  };
+  unsigned MaxVal = IsSVEPrefetch ? 15 : 31;
+
   // Either an identifier for named values or a 5-bit immediate.
   // Eat optional hash.
   if (parseOptionalToken(AsmToken::Hash) ||
@@ -2052,14 +2074,15 @@
       return MatchOperand_ParseFail;
     }
     unsigned prfop = MCE->getValue();
-    if (prfop > 31) {
-      TokError("prefetch operand out of range, [0,31] expected");
+    if (prfop > MaxVal) {
+      TokError("prefetch operand out of range, [0," + utostr(MaxVal) +
+               "] expected");
       return MatchOperand_ParseFail;
     }
 
-    auto PRFM = AArch64PRFM::lookupPRFMByEncoding(MCE->getValue());
+    auto PRFM = LookupByEncoding(MCE->getValue());
     Operands.push_back(AArch64Operand::CreatePrefetch(
-        prfop, PRFM ? PRFM->Name : "", S, getContext()));
+        prfop, PRFM.getValueOr(""), S, getContext()));
     return MatchOperand_Success;
   }
 
@@ -2068,7 +2091,7 @@
     return MatchOperand_ParseFail;
   }
 
-  auto PRFM = AArch64PRFM::lookupPRFMByName(Tok.getString());
+  auto PRFM = LookupByName(Tok.getString());
   if (!PRFM) {
     TokError("pre-fetch hint expected");
     return MatchOperand_ParseFail;
@@ -2076,7 +2099,7 @@
 
   Parser.Lex(); // Eat identifier token.
   Operands.push_back(AArch64Operand::CreatePrefetch(
-      PRFM->Encoding, Tok.getString(), S, getContext()));
+      *PRFM, Tok.getString(), S, getContext()));
   return MatchOperand_Success;
 }
 
Index: llvm/trunk/lib/Target/AArch64/InstPrinter/AArch64InstPrinter.h
===================================================================
--- llvm/trunk/lib/Target/AArch64/InstPrinter/AArch64InstPrinter.h
+++ llvm/trunk/lib/Target/AArch64/InstPrinter/AArch64InstPrinter.h
@@ -123,6 +123,7 @@
   void printImmScale(const MCInst *MI, unsigned OpNum,
                      const MCSubtargetInfo &STI, raw_ostream &O);
 
+  template <bool IsSVEPrefetch = false>
   void printPrefetchOp(const MCInst *MI, unsigned OpNum,
                        const MCSubtargetInfo &STI, raw_ostream &O);
 
Index: llvm/trunk/lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
===================================================================
--- llvm/trunk/lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
+++ llvm/trunk/lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
@@ -1061,15 +1061,22 @@
   O << ']';
 }
 
+template <bool IsSVEPrefetch>
 void AArch64InstPrinter::printPrefetchOp(const MCInst *MI, unsigned OpNum,
                                          const MCSubtargetInfo &STI,
                                          raw_ostream &O) {
   unsigned prfop = MI->getOperand(OpNum).getImm();
-  auto PRFM = AArch64PRFM::lookupPRFMByEncoding(prfop);
-  if (PRFM)
+  if (IsSVEPrefetch) {
+    if (auto PRFM = AArch64SVEPRFM::lookupSVEPRFMByEncoding(prfop)) {
+      O << PRFM->Name;
+      return;
+    }
+  } else if (auto PRFM = AArch64PRFM::lookupPRFMByEncoding(prfop)) {
     O << PRFM->Name;
-  else
-    O << '#' << formatImm(prfop);
+    return;
+  }
+
+  O << '#' << formatImm(prfop);
 }
 
 void AArch64InstPrinter::printPSBHintOp(const MCInst *MI, unsigned OpNum,
Index: llvm/trunk/lib/Target/AArch64/SVEInstrFormats.td
===================================================================
--- llvm/trunk/lib/Target/AArch64/SVEInstrFormats.td
+++ llvm/trunk/lib/Target/AArch64/SVEInstrFormats.td
@@ -27,6 +27,20 @@
   let ParserMatchClass = SVEPatternOperand;
 }
 
+def SVEPrefetchOperand : AsmOperandClass {
+  let Name = "SVEPrefetch";
+  let ParserMethod = "tryParsePrefetch<true>";
+  let PredicateMethod = "isPrefetch";
+  let RenderMethod = "addPrefetchOperands";
+}
+
+def sve_prfop : Operand<i32>, ImmLeaf<i32, [{
+    return (((uint32_t)Imm) <= 15);
+  }]> {
+  let PrintMethod = "printPrefetchOp<true>";
+  let ParserMatchClass = SVEPrefetchOperand;
+}
+
 class SVELogicalImmOperand<int Width> : AsmOperandClass {
   let Name = "SVELogicalImm" # Width;
   let DiagnosticType = "LogicalSecondSource";
Index: llvm/trunk/lib/Target/AArch64/Utils/AArch64BaseInfo.h
===================================================================
--- llvm/trunk/lib/Target/AArch64/Utils/AArch64BaseInfo.h
+++ llvm/trunk/lib/Target/AArch64/Utils/AArch64BaseInfo.h
@@ -335,6 +335,14 @@
   #include "AArch64GenSystemOperands.inc"
 }
 
+namespace AArch64SVEPRFM {
+  struct SVEPRFM : SysAlias {
+    using SysAlias::SysAlias;
+  };
+#define GET_SVEPRFM_DECL
+#include "AArch64GenSystemOperands.inc"
+}
+
 namespace AArch64SVEPredPattern {
   struct SVEPREDPAT {
     const char *Name;
Index: llvm/trunk/lib/Target/AArch64/Utils/AArch64BaseInfo.cpp
===================================================================
--- llvm/trunk/lib/Target/AArch64/Utils/AArch64BaseInfo.cpp
+++ llvm/trunk/lib/Target/AArch64/Utils/AArch64BaseInfo.cpp
@@ -61,6 +61,13 @@
 }
 
 namespace llvm {
+  namespace AArch64SVEPRFM {
+#define GET_SVEPRFM_IMPL
+#include "AArch64GenSystemOperands.inc"
+  }
+}
+
+namespace llvm {
   namespace AArch64SVEPredPattern {
 #define GET_SVEPREDPAT_IMPL
 #include "AArch64GenSystemOperands.inc"