--- a/progs/bfc1.scala	Thu Sep 26 12:59:33 2019 +0100
+++ b/progs/bfc1.scala	Thu Sep 26 14:12:11 2019 +0100
@@ -9,6 +9,7 @@
 def load_bff(name: String) : String = 
   Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
 
+// "splicing" a BF program counting occurrences
 def splice(cs: List[Char], acc: List[(Char, Int)]) : List[(Char, Int)] = (cs, acc) match {
   case (Nil, acc) => acc
   case (c :: cs, Nil) => splice(cs, List((c, 1)))
@@ -19,6 +20,7 @@
 
 def spl(s: String) = splice(s.toList, Nil).reverse
 
+// generating "compound" c-instructions 
 def instr2(c: Char, n: Int) : String = c match {
   case '>' => "ptr += " + n.toString + ";"
   case '<' => "ptr -= " + n.toString + ";"
@@ -59,7 +61,7 @@
 
 def compile_run(prog: String) = {
   compile("tmp", prog)
-  "gcc -O3 -o tmp tmp.c".!
+  "gcc -O0 -o tmp tmp.c".!
   "./tmp".!
   ()
 }
@@ -71,8 +73,10 @@
   (end - start) / (n * 1.0e9)
 }
 
+// mandelbrot program
+val b0 = load_bff("mandelbrot.bf")
 
-println(s"${time_needed(1, compile_run(load_bff("mandelbrot.bf")))} secs")
+println(s"${time_needed(1, compile_run(b0))} secs")