Add .LOOP instruction, dump memory to disk with cli arg

execution.odin

@@ -111,6 +111,9 @@ execute_instruction :: proc(cpu: ^Cpu, inst: Instruction) {
         case .JP, .JPE:  jump =  cpu.flags[.PF]
         case .JB, .JNAE: jump =  cpu.flags[.CF]
 
+        case .LOOP:
+            cpu.registers[.cx].full -= 1
+            jump = cpu.registers[.cx].full != 0
         case .LOOPNZ, .LOOPNE:
             cpu.registers[.cx].full -= 1
             // According to this resource, the loopnz inst does not change any flags

sim8086.odin

@@ -95,4 +95,18 @@ main :: proc() {
     if what_to_print == "instructions" || what_to_print == "all" {
         print_instructions_stdout(instructions_list[:])
     }
+    if len(os.args) > 3 && os.args[3] == "dump" {
+        f2,open_err := os.open("./listing-54.data", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o644)
+        if open_err == nil {
+            bytes_written,write_err := os.write(f2, cpu.memory[:])
+            if write_err == nil {
+                fmt.println("Dumpped", bytes_written, "to disk: listing-54.data")
+            } else {
+                fmt.println("Error2:", write_err)
+            }
+        } else {
+            fmt.println("Error1:", open_err)
+        }
+        defer os.close(f)
+    }
 }