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diff --git a/src/hls/PrintRTLBlock.ml b/src/hls/PrintRTLBlock.ml
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+(* *********************************************************************)
+(*                                                                     *)
+(*              The Compcert verified compiler                         *)
+(*                                                                     *)
+(*          Xavier Leroy, INRIA Paris-Rocquencourt                     *)
+(*                                                                     *)
+(*  Copyright Institut National de Recherche en Informatique et en     *)
+(*  Automatique.  All rights reserved.  This file is distributed       *)
+(*  under the terms of the INRIA Non-Commercial License Agreement.     *)
+(*                                                                     *)
+(* *********************************************************************)
+
+(** Pretty-printers for RTL code *)
+
+open Printf
+open Camlcoq
+open Datatypes
+open Maps
+open AST
+open RTLBlockInstr
+open RTLBlock
+open PrintAST
+open PrintRTLBlockInstr
+
+(* Printing of RTL code *)
+
+let reg pp r =
+  fprintf pp "x%d" (P.to_int r)
+
+let rec regs pp = function
+  | [] -> ()
+  | [r] -> reg pp r
+  | r1::rl -> fprintf pp "%a, %a" reg r1 regs rl
+
+let ros pp = function
+  | Coq_inl r -> reg pp r
+  | Coq_inr s -> fprintf pp "\"%s\"" (extern_atom s)
+
+let print_bblock pp (pc, i) =
+  fprintf pp "%5d:{\n" pc;
+  List.iter (print_bblock_body pp) i.bb_body;
+  print_bblock_exit pp i.bb_exit;
+  fprintf pp "\t}\n\n"
+
+let print_function pp id f =
+  fprintf pp "%s(%a) {\n" (extern_atom id) regs f.fn_params;
+  let instrs =
+    List.sort
+      (fun (pc1, _) (pc2, _) -> compare pc2 pc1)
+      (List.rev_map
+        (fun (pc, i) -> (P.to_int pc, i))
+        (PTree.elements f.fn_code)) in
+  List.iter (print_bblock pp) instrs;
+  fprintf pp "}\n\n"
+
+let print_globdef pp (id, gd) =
+  match gd with
+  | Gfun(Internal f) -> print_function pp id f
+  | _ -> ()
+
+let print_program pp (prog: program) =
+  List.iter (print_globdef pp) prog.prog_defs
+
+let destination : string option ref = ref None
+
+let print_if passno prog =
+  match !destination with
+  | None -> ()
+  | Some f ->
+     let oc = open_out (f ^ "." ^ Z.to_string passno) in
+     print_program oc prog;
+     close_out oc