Implement PRFM (register variant) as NOP (#1956)

* Implement PRFM (register variant) as NOP

Fix typo pfrm -> prfm
Add comments to distinguish variants

* Increment PTC version

ARMeilleure/Decoders/OpCodeTable.cs

@@ -144,9 +144,10 @@ namespace ARMeilleure.Decoders
             SetA64("101100100xxxxxxxxxxxxxxxxxxxxxxx", InstName.Orr,             InstEmit.Orr,             OpCodeAluImm.Create);
             SetA64("00101010xx0xxxxx0xxxxxxxxxxxxxxx", InstName.Orr,             InstEmit.Orr,             OpCodeAluRs.Create);
             SetA64("10101010xx0xxxxxxxxxxxxxxxxxxxxx", InstName.Orr,             InstEmit.Orr,             OpCodeAluRs.Create);
-            SetA64("1111100110xxxxxxxxxxxxxxxxxxxxxx", InstName.Pfrm,            InstEmit.Pfrm,            OpCodeMemImm.Create);
-            SetA64("11111000100xxxxxxxxx00xxxxxxxxxx", InstName.Pfrm,            InstEmit.Pfrm,            OpCodeMemImm.Create);
-            SetA64("11011000xxxxxxxxxxxxxxxxxxxxxxxx", InstName.Pfrm,            InstEmit.Pfrm,            OpCodeMemLit.Create);
+            SetA64("1111100110xxxxxxxxxxxxxxxxxxxxxx", InstName.Prfm,            InstEmit.Prfm,            OpCodeMemImm.Create); // immediate
+            SetA64("11111000100xxxxxxxxx00xxxxxxxxxx", InstName.Prfm,            InstEmit.Prfm,            OpCodeMemImm.Create); // prfum (unscaled offset)
+            SetA64("11011000xxxxxxxxxxxxxxxxxxxxxxxx", InstName.Prfm,            InstEmit.Prfm,            OpCodeMemLit.Create); // literal
+            SetA64("11111000101xxxxxxxxx10xxxxxxxxxx", InstName.Prfm,            InstEmit.Prfm,            OpCodeMemReg.Create); // register
             SetA64("x101101011000000000000xxxxxxxxxx", InstName.Rbit,            InstEmit.Rbit,            OpCodeAlu.Create);
             SetA64("1101011001011111000000xxxxx00000", InstName.Ret,             InstEmit.Ret,             OpCodeBReg.Create);
             SetA64("x101101011000000000001xxxxxxxxxx", InstName.Rev16,           InstEmit.Rev16,           OpCodeAlu.Create);

ARMeilleure/Instructions/InstEmitMemoryEx.cs

@@ -102,7 +102,7 @@ namespace ARMeilleure.Instructions
             }
         }
 
-        public static void Pfrm(ArmEmitterContext context)
+        public static void Prfm(ArmEmitterContext context)
         {
             // Memory Prefetch, execute as no-op.
         }

ARMeilleure/Instructions/InstName.cs

@@ -68,7 +68,7 @@ namespace ARMeilleure.Instructions
         Nop,
         Orn,
         Orr,
-        Pfrm,
+        Prfm,
         Rbit,
         Ret,
         Rev16,

ARMeilleure/Translation/PTC/Ptc.cs

@@ -22,7 +22,7 @@ namespace ARMeilleure.Translation.PTC
     {
         private const string HeaderMagic = "PTChd";
 
-        private const int InternalVersion = 1917; //! To be incremented manually for each change to the ARMeilleure project.
+        private const int InternalVersion = 1956; //! To be incremented manually for each change to the ARMeilleure project.
 
         private const string ActualDir = "0";
         private const string BackupDir = "1";