Sta::findWorstClkSkew

XingZiran · May 31, 2021 · 6a582fd · 6a582fd
1 parent 8e01d33
commit 6a582fd
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Showing 5 changed files with 40 additions and 4 deletions.
diff --git a/include/sta/Sta.hh b/include/sta/Sta.hh
@@ -878,6 +878,7 @@ public:
 		     const Corner *corner,
 		     const SetupHold *setup_hold,
 		     int digits);
+  float findWorstClkSkew(const SetupHold *setup_hold);
   // Header above reportPathEnd results.
   void reportPathEndHeader();
   // Footer below reportPathEnd results.

diff --git a/search/ClkSkew.cc b/search/ClkSkew.cc
@@ -129,11 +129,8 @@ ClkSkews::reportClkSkew(ClockSet *clks,
 
   // Sort the clocks to report in a stable order.
   ClockSeq sorted_clks;
-  ClockSet::Iterator clk_iter1(clks);
-  while (clk_iter1.hasNext()) {
-    Clock *clk = clk_iter1.next();
+  for (Clock *clk : *clks)
     sorted_clks.push_back(clk);
-  }
   sort(sorted_clks, ClkNameLess());
 
   Unit *time_unit = units_->timeUnit();
@@ -168,6 +165,25 @@ ClkSkews::reportClkSkew(ClockSet *clks,
   skews.deleteContents();
 }
 
+float
+ClkSkews::findWorstClkSkew(const Corner *corner,
+                           const SetupHold *setup_hold)
+{
+  ClockSet clks;
+  for (Clock *clk : *sdc_->clocks())
+    clks.insert(clk);
+  float worst_skew = INF;
+  ClkSkewMap skews;
+  findClkSkew(&clks, corner, setup_hold, skews);
+  for (auto clk_skew_itr : skews) {
+    ClkSkew *clk_skew = clk_skew_itr.second;
+    float skew = clk_skew->skew();
+    if (skew < worst_skew)
+      worst_skew = skew;
+  }
+  return worst_skew;
+}
+
 void
 ClkSkews::findClkSkew(ClockSet *clks,
 		      const Corner *corner,

diff --git a/search/ClkSkew.hh b/search/ClkSkew.hh
@@ -37,6 +37,9 @@ public:
 		     const Corner *corner,
 		     const SetupHold *setup_hold,
 		     int digits);
+  // Find worst clock skew.
+  float findWorstClkSkew(const Corner *corner,
+                         const SetupHold *setup_hold);
 
 protected:
   void findClkSkew(ClockSet *clks,

diff --git a/search/Sta.cc b/search/Sta.cc
@@ -2582,6 +2582,15 @@ Sta::reportClkSkew(ClockSet *clks,
   clk_skews_->reportClkSkew(clks, corner, setup_hold, digits);
 }
 
+float
+Sta::findWorstClkSkew(const SetupHold *setup_hold)
+{
+  ensureClkArrivals();
+  if (clk_skews_ == nullptr)
+    clk_skews_ = new ClkSkews(this);
+  return clk_skews_->findWorstClkSkew(cmd_corner_, setup_hold);
+}
+
 ////////////////////////////////////////////////////////////////
 
 void

diff --git a/tcl/StaTcl.i b/tcl/StaTcl.i
@@ -4453,6 +4453,13 @@ report_clk_skew(ClockSet *clks,
   delete clks;
 }
 
+float
+find_worst_clk_skew(const SetupHold *setup_hold)
+{
+  cmdLinkedNetwork();
+  return Sta::sta()->findWorstClkSkew(setup_hold);
+}
+
 TmpPinSet *
 startpoints()
 {