From dd7782e10bee79f63fc65ef5f0511e4c5c6612a2 Mon Sep 17 00:00:00 2001
From: James Cherry <cherry@parallaxsw.com>
Date: Thu, 7 Dec 2023 10:27:45 -0700
Subject: [PATCH] report_checks hang in latch loop

Signed-off-by: James Cherry <cherry@parallaxsw.com>
---
 search/Path.cc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/search/Path.cc b/search/Path.cc
index a09309ab..fa3756e6 100644
--- a/search/Path.cc
+++ b/search/Path.cc
@@ -16,6 +16,7 @@
 
 #include "Path.hh"
 
+#include "TimingRole.hh"
 #include "TimingArc.hh"
 #include "Network.hh"
 #include "Graph.hh"
@@ -339,11 +340,15 @@ Path::cmpAll(const Path *path1,
     if (cmp != 0)
       return cmp;
 
-    p1.prevPath(sta, p1);
-    p2.prevPath(sta, p2);
+    TimingArc *prev_arc1, *prev_arc2;
+    p1.prevPath(sta, p1, prev_arc1);
+    p2.prevPath(sta, p2, prev_arc2);
     if (equal(&p1, path1, sta))
       // Equivalent latch loops.
       return 0;
+    if ((prev_arc1 && prev_arc1->role()->isLatchDtoQ())
+        || (prev_arc2 && prev_arc2->role()->isLatchDtoQ()))
+      break;
   }
   if (p1.isNull() && p2.isNull())
     return 0;