diff --git a/vpi/sys_convert.c b/vpi/sys_convert.c
index 7479b7414..096630e0d 100644
--- a/vpi/sys_convert.c
+++ b/vpi/sys_convert.c
@@ -17,14 +17,45 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: sys_convert.c,v 1.2 2003/03/10 23:40:10 steve Exp $"
+#ident "$Id: sys_convert.c,v 1.3 2003/03/17 21:59:54 steve Exp $"
 #endif
 
 # include  "vpi_user.h"
 # include  "config.h"
 # include  <stdio.h>
+# include  <string.h>
 # include  <math.h>
 
+static double bits2double(PLI_UINT32 bits[2])
+{
+      union conv {
+	    double rval;
+	    unsigned char bval[sizeof(double)];
+      } conv;
+
+#ifdef WORDS_BIGENDIAN
+      conv.bval[7] = (bits[0] >>  0) & 0xff;
+      conv.bval[6] = (bits[0] >>  8) & 0xff;
+      conv.bval[5] = (bits[0] >> 16) & 0xff;
+      conv.bval[4] = (bits[0] >> 24) & 0xff;
+      conv.bval[3] = (bits[1] >>  0) & 0xff;
+      conv.bval[2] = (bits[1] >>  8) & 0xff;
+      conv.bval[1] = (bits[1] >> 16) & 0xff;
+      conv.bval[0] = (bits[1] >> 24) & 0xff;
+#else
+      conv.bval[0] = (bits[0] >>  0) & 0xff;
+      conv.bval[1] = (bits[0] >>  8) & 0xff;
+      conv.bval[2] = (bits[0] >> 16) & 0xff;
+      conv.bval[3] = (bits[0] >> 24) & 0xff;
+      conv.bval[4] = (bits[1] >>  0) & 0xff;
+      conv.bval[5] = (bits[1] >>  8) & 0xff;
+      conv.bval[6] = (bits[1] >> 16) & 0xff;
+      conv.bval[7] = (bits[1] >> 24) & 0xff;
+#endif
+
+      return conv.rval;
+}
+
 static void double2bits(double real, PLI_UINT32 bits[2])
 {
       union conv {
@@ -60,17 +91,86 @@ static int sizetf_64 (char*x) { return 64; }
 
 static int sys_convert_compiletf(char *name)
 {
-    vpiHandle call_hand, argv;
+    vpiHandle call_hand, argv, arg;
+    int rtn = 0;
 
     call_hand = vpi_handle(vpiSysTfCall, 0);
     argv = vpi_iterate(vpiArgument, call_hand);
+    arg  = vpi_scan(argv);
 
     if (!argv) {
 	vpi_printf("ERROR: %s requires a parameter.\n",
 		   vpi_get_str(vpiName, call_hand));
-	return -1;
+	rtn = -1;
     }
 
+    if (!strcmp("$bitstoreal", name) && vpi_get(vpiSize, arg) != 64) {
+	vpi_printf("ERROR: %s requires 64-bit argument.\n",
+		   vpi_get_str(vpiName, call_hand));
+	rtn = -1;
+    }
+
+    /* free iterator */
+    vpi_free_object(argv);
+
+    return rtn;
+}
+
+static int sys_bitstoreal_calltf(char *user)
+{
+    vpiHandle sys, argv, arg;
+    s_vpi_value value;
+
+    PLI_UINT32 bits[2];
+
+    /* find argument handle */
+    sys  = vpi_handle(vpiSysTfCall, 0);
+    argv = vpi_iterate(vpiArgument, sys);
+    arg  = vpi_scan(argv);
+
+    /* get value */
+    value.format = vpiVectorVal;
+    vpi_get_value(arg, &value);
+
+    /* convert */
+    bits[0] = (value.value.vector[0]).aval;
+    bits[1] = (value.value.vector[1]).aval;
+    value.value.real = bits2double(bits);
+    value.format = vpiRealVal;
+
+    /* return converted value */
+    vpi_put_value(sys, &value, 0, vpiNoDelay);
+
+    /* free iterator */
+    vpi_free_object(argv);
+
+    return 0;
+}
+
+static int sys_itor_calltf(char *user)
+{
+    vpiHandle sys, argv, arg;
+    s_vpi_value value;
+
+    /* find argument handle */
+    sys  = vpi_handle(vpiSysTfCall, 0);
+    argv = vpi_iterate(vpiArgument, sys);
+    arg  = vpi_scan(argv);
+
+    /* get value */
+    value.format = vpiIntVal;
+    vpi_get_value(arg, &value);
+
+    /* convert */
+    value.value.real = (PLI_INT32)value.value.integer;
+    value.format = vpiRealVal;
+
+    /* return converted value */
+    vpi_put_value(sys, &value, 0, vpiNoDelay);
+
+    /* free iterator */
+    vpi_free_object(argv);
+
     return 0;
 }
 
@@ -105,6 +205,9 @@ static int sys_realtobits_calltf(char *user)
     /* return converted value */
     vpi_put_value(sys, &value, 0, vpiNoDelay);
 
+    /* free iterator */
+    vpi_free_object(argv);
+
     return 0;
 }
 
@@ -133,6 +236,9 @@ static int sys_rtoi_calltf(char *user)
     /* return converted value */
     vpi_put_value(sys, &value, 0, vpiNoDelay);
 
+    /* free iterator */
+    vpi_free_object(argv);
+
     return 0;
 }
 
@@ -144,16 +250,16 @@ void sys_convert_register()
       tf_data.tfname    = "$bitstoreal";
       tf_data.sizetf    = sizetf_64;
       tf_data.compiletf = sys_convert_compiletf;
-      tf_data.calltf    = NULL; // sys_bitstoreal_calltf;
-      tf_data.user_data = NULL;
+      tf_data.calltf    = sys_bitstoreal_calltf;
+      tf_data.user_data = tf_data.tfname;
       vpi_register_systf(&tf_data);
 
       tf_data.type      = vpiSysFunc;
       tf_data.tfname    = "$itor";
       tf_data.sizetf    = sizetf_64;
       tf_data.compiletf = sys_convert_compiletf;
-      tf_data.calltf    = NULL; // sys_itor_calltf;
-      tf_data.user_data = NULL;
+      tf_data.calltf    = sys_itor_calltf;
+      tf_data.user_data = tf_data.tfname;
       vpi_register_systf(&tf_data);
 
       tf_data.type      = vpiSysFunc;
@@ -161,7 +267,7 @@ void sys_convert_register()
       tf_data.sizetf    = sizetf_64;
       tf_data.compiletf = sys_convert_compiletf;
       tf_data.calltf    = sys_realtobits_calltf;
-      tf_data.user_data = NULL;
+      tf_data.user_data = tf_data.tfname;
       vpi_register_systf(&tf_data);
 
       tf_data.type      = vpiSysFunc;
@@ -169,12 +275,15 @@ void sys_convert_register()
       tf_data.sizetf    = sizetf_32;
       tf_data.compiletf = sys_convert_compiletf;
       tf_data.calltf    = sys_rtoi_calltf;
-      tf_data.user_data = NULL;
+      tf_data.user_data = tf_data.tfname;
       vpi_register_systf(&tf_data);
 }
 
 /*
  * $Log: sys_convert.c,v $
+ * Revision 1.3  2003/03/17 21:59:54  steve
+ *  Implement $itor and $bitstoreal
+ *
  * Revision 1.2  2003/03/10 23:40:10  steve
  *  Add support for $rtoi
  *