Index: lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
===================================================================
--- lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
+++ lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
@@ -14,29 +14,26 @@
 #ifndef LLVM_LIB_TARGET_POWERPC_INSTPRINTER_PPCINSTPRINTER_H
 #define LLVM_LIB_TARGET_POWERPC_INSTPRINTER_PPCINSTPRINTER_H
 
+#include "llvm/ADT/Triple.h"
 #include "llvm/MC/MCInstPrinter.h"
 
 namespace llvm {
 
 class PPCInstPrinter : public MCInstPrinter {
-  bool IsDarwin;
+  Triple TripleInfo;
 public:
   PPCInstPrinter(const MCAsmInfo &MAI, const MCInstrInfo &MII,
-                 const MCRegisterInfo &MRI, bool isDarwin)
-    : MCInstPrinter(MAI, MII, MRI), IsDarwin(isDarwin) {}
-  
-  bool isDarwinSyntax() const {
-    return IsDarwin;
-  }
-  
+                 const MCRegisterInfo &MRI, Triple T)
+    : MCInstPrinter(MAI, MII, MRI), TripleInfo(T) {}
+
   void printRegName(raw_ostream &OS, unsigned RegNo) const override;
   void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot,
                  const MCSubtargetInfo &STI) override;
-  
+
   // Autogenerated by tblgen.
   void printInstruction(const MCInst *MI, raw_ostream &O);
   static const char *getRegisterName(unsigned RegNo);
-  
+
   bool printAliasInstr(const MCInst *MI, raw_ostream &OS);
   void printCustomAliasOperand(const MCInst *MI, unsigned OpIdx,
                                unsigned PrintMethodIdx,
Index: lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
===================================================================
--- lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
+++ lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
@@ -39,6 +39,12 @@
 ShowVSRNumsAsVR("ppc-vsr-nums-as-vr", cl::Hidden, cl::init(false),
              cl::desc("Prints full register names with vs{31-63} as v{0-31}"));
 
+// Prints full register names with percent symbol.
+static cl::opt<bool>
+FullRegNamesWithPercent("print-reg-with-percent-prefix",
+                         cl::Hidden, cl::init(false),
+                         cl::desc("Prints full register names with percent"));
+
 #define PRINT_ALIAS_INSTR
 #include "PPCGenAsmWriter.inc"
 
@@ -445,7 +451,6 @@
     O << '@' << MCSymbolRefExpr::getVariantKindName(refExp.getKind());
 }
 
-
 /// stripRegisterPrefix - This method strips the character prefix from a
 /// register name so that only the number is left.  Used by for linux asm.
 static const char *stripRegisterPrefix(const char *RegName, unsigned RegNum,
@@ -481,6 +486,25 @@
   return RegName;
 }
 
+/// showRegistersWithPercentPrefix - Check if name has prefix to insert
+/// percent symbol.
+static bool showRegistersWithPercentPrefix(const char *RegName) {
+    if (FullRegNamesWithPercent) {
+        switch (RegName[0]) {
+        case 'r':
+        case 'f':
+        case 'q':
+        case 'v':
+        case 'c':
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    return false;
+}
+
 void PPCInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
                                   raw_ostream &O) {
   const MCOperand &Op = MI->getOperand(OpNo);
@@ -503,9 +527,19 @@
     }
 
     const char *RegName = getRegisterName(Reg);
-    // The linux and AIX assembler does not take register prefixes.
-    if (!isDarwinSyntax())
-      RegName = stripRegisterPrefix(RegName, Reg, MRI.getEncodingValue(Reg));
+
+    // AIX assembler does not take register prefixes.
+    // Darwin assembler take full register prefixes.
+    if (!TripleInfo.isOSDarwin()) {
+        if (showRegistersWithPercentPrefix(RegName)) {
+            // Print register with percent symbol and prefix.
+            O << "%";
+        } else {
+            // Print register without prefix.
+            RegName = stripRegisterPrefix(RegName, Reg,
+                                          MRI.getEncodingValue(Reg));
+        }
+    }
 
     O << RegName;
     return;
Index: lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
===================================================================
--- lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
+++ lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
@@ -239,7 +239,7 @@
                                              const MCAsmInfo &MAI,
                                              const MCInstrInfo &MII,
                                              const MCRegisterInfo &MRI) {
-  return new PPCInstPrinter(MAI, MII, MRI, T.isOSDarwin());
+  return new PPCInstPrinter(MAI, MII, MRI, T);
 }
 
 extern "C" void LLVMInitializePowerPCTargetMC() {