max_slew/fanout/capacitance_check_slack in user units

Signed-off-by: James Cherry <cherry@parallaxsw.com>

include/sta/Units.hh

@@ -26,6 +26,10 @@ public:
   Unit(float scale,
        const char *suffix,
        int digits);
+  // Convert from sta units to user interface units.
+  double staToUser(double value);
+  // Convert from user interface units to sta units.
+  double userToSta(double value);
   void operator=(const Unit &unit);
   float scale() const { return scale_; }
   void setScale(float scale);

liberty/Units.cc

@@ -58,6 +58,18 @@ Unit::operator=(const Unit &unit)
   digits_ = unit.digits_;
 }
 
+double
+Unit::staToUser(double value)
+{
+  return value / scale_;
+}
+
+double
+Unit::userToSta(double value)
+{
+  return value * scale_;
+}
+
 void
 Unit::setScale(float scale)
 {

search/CheckFanoutLimits.cc

@@ -93,7 +93,7 @@ CheckFanoutLimits::checkFanout(const Pin *pin,
   findLimit(pin, min_max, limit1, limit1_exists);
   if (limit1_exists)
     checkFanout(pin, min_max, limit1,
-		fanout, slack, limit);
+		fanout, limit, slack);
 }
   
 // return the tightest limit.
@@ -184,8 +184,8 @@ CheckFanoutLimits::checkFanout(const Pin *pin,
 			       float limit1,
 			       // Return values.
 			       float &fanout,
-			       float &slack,
+			       float &limit,
-			       float &limit) const
+			       float &slack) const
 {
   float fanout1 = fanoutLoad(pin);
   float slack1 = (min_max == MinMax::max())

search/CheckFanoutLimits.hh

@@ -41,15 +41,15 @@ public:
   PinSeq *checkFanoutLimits(Net *net,
                             bool violators,
                             const MinMax *min_max);
+
+protected:
   void checkFanout(const Pin *pin,
 		   const MinMax *min_max,
 		   float limit1,
 		   // Return values.
 		   float &fanout,
-		   float &slack,
+		   float &limit,
-		   float &limit) const;
+		   float &slack) const;
-
-protected:
   void findLimit(const Pin *pin,
 		 const MinMax *min_max,
 		 // Return values.

search/Sta.cc

@@ -5277,7 +5277,7 @@ Sta::maxFanoutCheckSlack()
     Pin *pin = (*pins)[0];
     float fanout;
     float limit;
-    check_fanout_limits_->checkFanout(pin, MinMax::max(), true,
+    check_fanout_limits_->checkFanout(pin, MinMax::max(),
                                       fanout, limit, slack);
   }
   delete pins;

tcl/StaTcl.i

@@ -3918,89 +3918,91 @@ format_area(const char *value,
 
 ////////////////////////////////////////////////////////////////
 
-// Unit converstion from sta unit to user interface and visa versa.
+// <unit>_sta_ui conversion from sta units to user interface units.
+// <unit>_ui_sta conversion from user interface units to sta units.
+
 double
 time_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->timeUnit()->scale();
+  return Sta::sta()->units()->timeUnit()->userToSta(value);
 }
 
 double
 time_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->timeUnit()->scale();
+  return Sta::sta()->units()->timeUnit()->staToUser(value);
 }
 
 double
 capacitance_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->capacitanceUnit()->scale();
+  return Sta::sta()->units()->capacitanceUnit()->userToSta(value);
 }
 
 double
 capacitance_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->capacitanceUnit()->scale();
+  return Sta::sta()->units()->capacitanceUnit()->staToUser(value);
 }
 
 double
 resistance_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->resistanceUnit()->scale();
+  return Sta::sta()->units()->resistanceUnit()->userToSta(value);
 }
 
 double
 resistance_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->resistanceUnit()->scale();
+  return Sta::sta()->units()->resistanceUnit()->staToUser(value);
 }
 
 double
 voltage_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->voltageUnit()->scale();
+  return Sta::sta()->units()->voltageUnit()->userToSta(value);
 }
 
 double
 voltage_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->voltageUnit()->scale();
+  return Sta::sta()->units()->voltageUnit()->staToUser(value);
 }
 
 double
 current_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->currentUnit()->scale();
+  return Sta::sta()->units()->currentUnit()->userToSta(value);
 }
 
 double
 current_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->currentUnit()->scale();
+  return Sta::sta()->units()->currentUnit()->staToUser(value);
 }
 
 double
 power_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->powerUnit()->scale();
+  return Sta::sta()->units()->powerUnit()->userToSta(value);
 }
 
 double
 power_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->powerUnit()->scale();
+  return Sta::sta()->units()->powerUnit()->staToUser(value);
 }
 
 double
 distance_ui_sta(double value)
 {
-  return value * Sta::sta()->units()->distanceUnit()->scale();
+  return Sta::sta()->units()->distanceUnit()->userToSta(value);
 }
 
 double
 distance_sta_ui(double value)
 {
-  return value / Sta::sta()->units()->distanceUnit()->scale();
+  return Sta::sta()->units()->distanceUnit()->staToUser(value);
 }
 
 double
@@ -4759,7 +4761,8 @@ float
 max_slew_check_slack()
 {
   cmdLinkedNetwork();
-  return Sta::sta()->maxSlewCheckSlack();
+  Sta *sta = Sta::sta();
+  return sta->units()->timeUnit()->staToUser(sta->maxSlewCheckSlack());
 }
 
 void
@@ -4852,7 +4855,8 @@ float
 max_capacitance_check_slack()
 {
   cmdLinkedNetwork();
-  return Sta::sta()->maxCapacitanceCheckSlack();
+  Sta *sta = Sta::sta();
+  return sta->units()->capacitanceUnit()->staToUser(sta->maxCapacitanceCheckSlack());
 }
 
 void