optimize Mult and Fill assembly

projects/04/mult/Mult.asm

@@ -13,10 +13,9 @@
 
 // variable names are selfexplanatory
 // itr temporary register at RAM[16]
-// sum temporary register at RAM[17]
-@itr
+@R2
 M=0
-@sum
+@itr
 M=0
 
 // loop declaration
@@ -28,14 +27,14 @@ M=0
 D=M
 @R1
 D=D-M
-@STOP
+@END
 D;JEQ
 
-// sum = R0 + sum
+// R2 = R0 + R2
 // itr = itr + 1
 @R0
 D=M
-@sum
+@R2
 M=D+M
 @itr
 M=M+1
@@ -44,13 +43,6 @@ M=M+1
 @LOOP
 0;JMP
 
-// R2 = sum
-    (STOP)
-@sum
-D=M
-@R2
-M=D
-
 // loopy loop
     (END)
 @END