diff --git a/include/mpfr_lustre.c b/include/mpfr_lustre.c
index bea22e579fbc4d89533f675dfa932d0631b7692a..b8f427b2949c42ad3472df4856efea45490d73a2 100644
--- a/include/mpfr_lustre.c
+++ b/include/mpfr_lustre.c
@@ -101,6 +101,54 @@ void MPFRint_to_real_step (int i, mpfr_t out)
 {
   mpfr_set_si(out, i, MPFR_RNDN);
 }
+
+void MPFRreal_to_int_step (mpfr_t in1, int *out)
+{
+  *out = mpfr_get_sj (in1, MPFR_RNDN); 
+}
+
+void MPFRFloor (mpfr_t in1, int *out)
+{
+  mpfr_t tmp;
+  int prec;
+  mpfr_init (tmp); // would be better to avoid local init  
+  prec = mpfr_get_prec (in1);
+  mpfr_set_prec(tmp, prec);
+
+  mpfr_floor(tmp, in1);
+  *out = mpfr_get_sj (tmp, MPFR_RNDN);
+
+  mpfr_clear(tmp);
+}
+
+void MPFRCeiling (mpfr_t in1, int *out)
+{
+  mpfr_t tmp;
+  int prec;
+  mpfr_init (tmp); // would be better to avoid local init  
+  prec = mpfr_get_prec (in1);
+  mpfr_set_prec(tmp, prec);
+  
+  mpfr_ceil(tmp, in1);
+  *out = mpfr_get_sj (tmp, MPFR_RNDN);
+
+  mpfr_clear(tmp);
+}
+
+void MPFRRound (mpfr_t in1, int *out)
+{
+  mpfr_t tmp;
+  int prec;
+  mpfr_init (tmp); // would be better to avoid local init  
+  prec = mpfr_get_prec (in1);
+  mpfr_set_prec(tmp, prec);
+  
+  mpfr_round(tmp, in1);
+  *out = mpfr_get_sj (tmp, MPFR_RNDN);
+
+  mpfr_clear(tmp);
+}
+
 // functions of lustrec_math
 void MPFRacos_step (mpfr_t i, 
                              mpfr_t out
diff --git a/include/mpfr_lustre.lusi b/include/mpfr_lustre.lusi
index 801d53af29c699e534b8a5b1873a6f877cf7fb41..6e7f0f9be51bdb482618ab87f64f6f2fcae42e54 100644
--- a/include/mpfr_lustre.lusi
+++ b/include/mpfr_lustre.lusi
@@ -22,6 +22,10 @@ function MPFRNeq(i1, i2: real) returns (out: bool);
 
 -- Functions already available in conv
 function MPFRint_to_real (x: int) returns (y: real);
+function MPFRreal_to_int (in1: real) returns (out: int);
+function MPFRFloor (in1: real) returns (out: int);
+function MPFRCeiling (in1: real) returns (out: int);
+function MPFRRound (in1: real) returns (out: int);
 
 -- Functions already available in lustrec_math
 
diff --git a/src/backends/C/c_backend_common.ml b/src/backends/C/c_backend_common.ml
index 9536034dde77636d4a3db4acb818c7be19361b65..462de54dd05a246e2a4677231526db488b550017 100644
--- a/src/backends/C/c_backend_common.ml
+++ b/src/backends/C/c_backend_common.ml
@@ -723,13 +723,16 @@ let print_put_var fmt file_suffix name var_type var_id =
     pp_file fmt "i" var_id
   )
   else if Types.is_real_type unclocked_t then
-    let _ =
-      if !Options.mpfr then
-        fprintf fmt "_put_double(\"%s\", mpfr_get_d(%s, %s), %i);@ " name var_id (Mpfr.mpfr_rnd ()) !Options.print_prec_double
-      else
-        fprintf fmt "_put_double(\"%s\", %s, %i);@ " name var_id !Options.print_prec_double
-    in
-    pp_file fmt ".*f" ((string_of_int !Options.print_prec_double) ^ ", " ^ var_id)
+    
+      if !Options.mpfr then (
+        fprintf fmt "_put_double(\"%s\", mpfr_get_d(%s, %s), %i);@ " name var_id (Mpfr.mpfr_rnd ()) !Options.print_prec_double;
+        pp_file fmt ".*f" ((string_of_int !Options.print_prec_double) ^ ", mpfr_get_d(" ^ var_id ^ ", MPFR_RNDN)")
+      )
+      else (
+        fprintf fmt "_put_double(\"%s\", %s, %i);@ " name var_id !Options.print_prec_double;
+        pp_file fmt ".*f" ((string_of_int !Options.print_prec_double) ^ ", " ^ var_id)
+      )
+    
   else
     (Format.eprintf "Impossible to print the _put_xx for type %a@.@?" Types.print_ty var_type; assert false)
 
diff --git a/src/plugins/mpfr/mpfr.ml b/src/plugins/mpfr/mpfr.ml
index 76ea13bf6f97927f520bfa4de2775f202e932f60..0f43e6d772e84b34753c6b0ea98b2271951f8908 100644
--- a/src/plugins/mpfr/mpfr.ml
+++ b/src/plugins/mpfr/mpfr.ml
@@ -16,6 +16,8 @@ open Corelang
 open Normalization
 open Machine_code_common
 
+let report = Log.report ~plugin:"MPFR"
+           
 let mpfr_module = mktop (Open(false, "mpfr_lustre"))
 let cpt_fresh = ref 0
   
@@ -99,6 +101,14 @@ let base_inject_op id =
   | "!="     -> "MPFRNeq"
   (* Conv functions *)
   | "int_to_real" -> "MPFRint_to_real"
+  | "real_to_int" -> "MPFRreal_to_int"
+  | "_floor" -> "MPFRfloor"        
+  | "_ceil" -> "MPFRceil"        
+  | "_round" -> "MPFRround"        
+  | "_Floor" -> "MPFRFloor"        
+  | "_Ceiling" -> "MPFRCeiling"        
+  | "_Round" -> "MPFRRound"        
+       
   (* Math library functions *)
   | "acos" -> "MPFRacos"
   | "acosh" -> "MPFRacosh"
@@ -128,7 +138,7 @@ let base_inject_op id =
   | _        -> raise Not_found
 
 let inject_op id =
-  Format.eprintf "trying to inject mpfr into function %s@." id;
+  report ~level:3 (fun fmt -> Format.fprintf fmt "trying to inject mpfr into function %s@." id);
   try
     base_inject_op id
   with Not_found -> id