finished the interpreter

resources/dsa/bf.dsa

@@ -5,7 +5,35 @@
 include print "./lib/print.dsa"
 
 // "print hello world"
-db program: "++++++[>++++++++++++<-]>.>++++++++++[>++++++++++<-]>+.+++++++..+++.>++++[>+++++++++++<-]>.<+++[>----<-]>.<<<<<+++[>+++++<-]>.>>.+++.------.--------.>>+."
+db program: "++++++++++++++++++++++++++++++++++++++++++++
+>++++++++++++++++++++++++++++++++
+>++++++++++++++++
+>
+>+
+<<
+[
+>>
+>
+>++++++++++
+<<
+[->+>-[>+>>]>[+[-<+>]>+>>]<<<<<<]
+>[<+>-]
+>[-]
+>>
+>++++++++++
+<
+[->-[>+>>]>[+[-<+>]>+>>]<<<<<]
+>[-]
+>>[++++++++++++++++++++++++++++++++++++++++++++++++.[-]]
+<[++++++++++++++++++++++++++++++++++++++++++++++++.[-]]
+<<<++++++++++++++++++++++++++++++++++++++++++++++++.[-]
+<<<<<<<.>.
+>>[>>+<<-]
+>[>+<<+>-]
+>[<+>-]
+<<<-
+]
+<<++..."
 
 db error: "Invalid Instruction!"
 dw stack: 0x10000
@@ -41,13 +69,6 @@ loop_start:
     // load the current instruction into rg3
     ldb rg0, rg3
 
-
-    pusha 2
-    push rg3
-    call print::print_byte
-    pop zero
-    popa 2
-
     // switch on the instruction
     // all cases will return to either loop_start or loop_end
     cmp rg3, rg8
@@ -70,13 +91,14 @@ loop_start:
     jeq end
 
 	// if we get here, we don't know what the instruction is
-end:
 	lwi error, rg2
     pusha 2
     push rg2
     call print::print
     pop zero
     popa 2
+
+end:
     hlt
 
 loop_end:
@@ -106,7 +128,7 @@ inc_ptr:
 // ------------------------------------------
 // decrement the pointer
 dec_ptr:
-    stw rg1, rg2
+    stw rg2, rg1
     subi rg1, 4
     ldw rg1, rg2
     jmp loop_end