diff --git a/compiler/aoptobj.pas b/compiler/aoptobj.pas
index 33ca522e55..ab3327302a 100644
--- a/compiler/aoptobj.pas
+++ b/compiler/aoptobj.pas
@@ -351,6 +351,7 @@ Unit AoptObj;
       Function TUsedRegs.IsUsed(Reg: TRegister): Boolean;
       Begin
         //!!!!!!!!!!! IsUsed := Reg in UsedRegs
+        Result:=False; { unimplemented }
       End;
 
       Function TUsedRegs.GetUsedRegs: TRegSet;
@@ -385,6 +386,7 @@ Unit AoptObj;
           TmpResult: Boolean;
       }
       begin
+        Result:=False; { unimplemented }
       (*!!!!!!!!!!1
         RegsChecked := [];
         content := regs[which];
@@ -458,6 +460,7 @@ Unit AoptObj;
 
       Function ArrayRefsEq(const r1, r2: TReference): Boolean;
       Begin
+        Result:=False; { unimplemented }
       (*!!!!!!!!!!
         ArrayRefsEq := (R1.Offset+R1.OffsetFixup = R2.Offset+R2.OffsetFixup) And
       {$ifdef refsHaveSegmentReg}
@@ -658,16 +661,19 @@ Unit AoptObj;
 
       Function TPaiProp.GetWState(Reg: TRegister): TStateInt; {$ifdef inl} inline;{$endif inl}
       Begin
+        Result:=0; { unimplemented }
         //!!!! GetWState := Regs[Reg].WState
       End;
 
       Function TPaiProp.GetRState(Reg: TRegister): TStateInt; {$ifdef inl} inline;{$endif inl}
       Begin
+        Result:=0; { unimplemented }
         //!!!! GetRState := Regs[Reg].RState
       End;
 
       Function TPaiProp.GetRegContentType(Reg: TRegister): Byte; {$ifdef inl} inline;{$endif inl}
       Begin
+        Result:=0; { unimplemented }
         //!!!! GetRegContentType := Regs[Reg].typ
       End;
 
diff --git a/compiler/arm/aasmcpu.pas b/compiler/arm/aasmcpu.pas
index 48f8dd5829..1205371c77 100644
--- a/compiler/arm/aasmcpu.pas
+++ b/compiler/arm/aasmcpu.pas
@@ -1034,6 +1034,7 @@ implementation
 
     function taicpu.CheckIfValid:boolean;
       begin
+        Result:=False; { unimplemented }
       end;
 
 
@@ -1122,6 +1123,7 @@ implementation
 
     function  taicpu.InsEnd:longint;
       begin
+        Result:=0; { unimplemented }
       end;
 
 
@@ -1440,6 +1442,7 @@ implementation
 
     function  taicpu.NeedAddrPrefix(opidx:byte):boolean;
       begin
+        Result:=False; { unimplemented }
       end;