ArcDelayCalc::reduceSupported()

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

dcalc/CcsCeffDelayCalc.hh

@@ -36,7 +36,7 @@ public:
   virtual ~CcsCeffDelayCalc();
   ArcDelayCalc *copy() override;
   const char *name() const override { return "ccs_ceff"; }
-
+  bool reduceSupported() const override { return true; }
   ArcDcalcResult gateDelay(const Pin *drvr_pin,
                            const TimingArc *arc,
                            const Slew &in_slew,

dcalc/CcsSimDelayCalc.hh

@@ -59,6 +59,7 @@ public:
   Parasitic *findParasitic(const Pin *drvr_pin,
                            const RiseFall *rf,
                            const DcalcAnalysisPt *dcalc_ap) override;
+  bool reduceSupported() const override { return false; }
   Parasitic *reduceParasitic(const Parasitic *parasitic_network,
                              const Pin *drvr_pin,
                              const RiseFall *rf,

dcalc/DmpCeff.hh

@@ -34,6 +34,7 @@ class DmpCeffDelayCalc : public LumpedCapDelayCalc
 public:
   DmpCeffDelayCalc(StaState *sta);
   virtual ~DmpCeffDelayCalc();
+  bool reduceSupported() const override { return true; }
   ArcDcalcResult gateDelay(const Pin *drvr_pin,
                            const TimingArc *arc,
                            const Slew &in_slew,

dcalc/LumpedCapDelayCalc.hh

@@ -31,6 +31,7 @@ public:
   Parasitic *findParasitic(const Pin *drvr_pin,
                            const RiseFall *rf,
                            const DcalcAnalysisPt *dcalc_ap) override;
+  bool reduceSupported() const override { return true; }
   Parasitic *reduceParasitic(const Parasitic *parasitic_network,
                              const Pin *drvr_pin,
                              const RiseFall *rf,

dcalc/UnitDelayCalc.hh

@@ -30,6 +30,7 @@ public:
   Parasitic *findParasitic(const Pin *drvr_pin,
                            const RiseFall *rf,
                            const DcalcAnalysisPt *dcalc_ap) override;
+  bool reduceSupported() const override { return false; }
   Parasitic *reduceParasitic(const Parasitic *parasitic_network,
                              const Pin *drvr_pin,
                              const RiseFall *rf,

include/sta/ArcDelayCalc.hh

@@ -166,6 +166,7 @@ public:
   virtual Parasitic *findParasitic(const Pin *drvr_pin,
 				   const RiseFall *rf,
 				   const DcalcAnalysisPt *dcalc_ap) = 0;
+  virtual bool reduceSupported() const = 0;
   // Reduce parasitic_network to a representation acceptable to the delay calculator.
   virtual Parasitic *reduceParasitic(const Parasitic *parasitic_network,
                                      const Pin *drvr_pin,

parasitics/SpefReader.cc

@@ -55,6 +55,12 @@ readSpefFile(const char *filename,
              StaState *sta)
 {
   bool success = false;
+  const ArcDelayCalc *arc_delay_calc = sta->arcDelayCalc();
+  if (reduce && !arc_delay_calc->reduceSupported()) {
+    sta->report()->warn(1658, "Delay calculator %s does not support reduction.",
+                        arc_delay_calc->name());
+    reduce = false;
+  }
   // Use zlib to uncompress gzip'd files automagically.
   gzFile stream = gzopen(filename, "rb");
   if (stream) {