timing: Add safe zero check function for delay_t

YosysHQ · Sep 18, 2024 · 922b7d3 · 922b7d3
1 parent 3aedaf1
commit 922b7d3
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Showing 2 changed files with 12 additions and 2 deletions.
diff --git a/common/kernel/nextpnr_types.h b/common/kernel/nextpnr_types.h
@@ -78,6 +78,16 @@ struct PortRef
     IdString port;
 };
 
+// Zero checking which works regardless if delay_t is floating or integer
+inline bool is_zero_delay(delay_t delay)
+{
+    if constexpr (std::is_floating_point<delay_t>::value) {
+        return std::fpclassify(delay) == FP_ZERO;
+    } else {
+        return delay == 0;
+    }
+}
+
 // minimum and maximum delay
 struct DelayPair
 {

diff --git a/common/kernel/timing.cc b/common/kernel/timing.cc
@@ -985,7 +985,7 @@ CriticalPath TimingAnalyser::build_critical_path_report(domain_id_t domain_pair,
 
     if (related_clock) {
         delay_t clock_delay = clock_delays.at(clock_pair);
-        if (clock_delay != 0) {
+        if (!is_zero_delay(clock_delay)) {
             CriticalPath::Segment seg_c2c;
             seg_c2c.type = CriticalPath::Segment::Type::CLK_TO_CLK;
             seg_c2c.delay = DelayPair(clock_delay);
@@ -1005,7 +1005,7 @@ CriticalPath TimingAnalyser::build_critical_path_report(domain_id_t domain_pair,
 
         delay_t clock_skew = clock_delay_launch - clock_delay_capture;
 
-        if (clock_skew != 0) {
+        if (!is_zero_delay(clock_skew)) {
             CriticalPath::Segment seg_skew;
             seg_skew.type = CriticalPath::Segment::Type::CLK_SKEW;
             seg_skew.delay = DelayPair(clock_skew);