From 6f2bb477acaf01a71794a3c7a9857f038dcdcba9 Mon Sep 17 00:00:00 2001
From: zxq5 <zxq5@zxq5.dev>
Date: Tue, 24 Jun 2025 19:31:55 +0100
Subject: [PATCH] finished the interpreter

---
 resources/dsa/bf.dsa | 46 ++++++++++++++++++++++++++++++++------------
 1 file changed, 34 insertions(+), 12 deletions(-)

diff --git a/resources/dsa/bf.dsa b/resources/dsa/bf.dsa
index 96b2e60..d87d25f 100644
--- a/resources/dsa/bf.dsa
+++ b/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
@@ -69,14 +90,15 @@ loop_start:
     cmp rg3, zero
     jeq end
 
-    // if we get here, we don't know what the instruction is
-end:
-    lwi error, rg2
+	// if we get here, we don't know what the instruction is
+	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