Index: lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
===================================================================
--- lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
+++ lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
@@ -437,6 +437,10 @@
     // The linux and AIX assembler does not take register prefixes.
     if (!isDarwinSyntax())
       RegName = stripRegisterPrefix(RegName);
+
+    if (FullRegNames && !isDarwinSyntax() &&
+        Op.getReg() != PPC::ZERO && Op.getReg() < PPC::ZERO8)
+      O << '%';
     
     O << RegName;
     return;
Index: test/CodeGen/PowerPC/reg-names.ll
===================================================================
--- test/CodeGen/PowerPC/reg-names.ll
+++ test/CodeGen/PowerPC/reg-names.ll
@@ -9,7 +9,21 @@
   ret i64 %b
 
 ; CHECK: mr 3, 4
-; CHECK-FN: mr r3, r4
+; CHECK-FN: mr %r3, %r4
+
+; CHECK: blr
+; CHECK-FN: blr
+}
+
+define i64 @test2(i64 %a, i64 %b) {
+; CHECK-LABEL: @test2
+; CHECK-FN-LABEL: @test2
+
+entry:
+  ret i64 0
+
+; CHECK: li 3, 0
+; CHECK-FN: li %r3, 0
 
 ; CHECK: blr
 ; CHECK-FN: blr