[PATCH 2/2] Do not follow zero edges in cycle detection (PR gcov-profile/90380).

[marxin]

gcc/ChangeLog:

2019-05-09  Martin Liska  <mli...@suse.cz>

        * gcov.c (circuit): Ignore zero count arcs.
---
 gcc/gcov.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)


diff --git a/gcc/gcov.c b/gcc/gcov.c
index 6bcd2b23748..f409d67e12c 100644
--- a/gcc/gcov.c
+++ b/gcc/gcov.c
@@ -742,7 +742,9 @@ circuit (block_info *v, arc_vector_t &path, block_info *start,
   for (arc_info *arc = v->succ; arc; arc = arc->succ_next)
     {
       block_info *w = arc->dst;
-      if (w < start || !linfo.has_block (w))
+      if (w < start
+	  || arc->count == 0
+	  || !linfo.has_block (w))
 	continue;
 
       path.push_back (arc);
@@ -765,7 +767,9 @@ circuit (block_info *v, arc_vector_t &path, block_info *start,
     for (arc_info *arc = v->succ; arc; arc = arc->succ_next)
       {
 	block_info *w = arc->dst;
-	if (w < start || !linfo.has_block (w))
+	if (w < start
+	    || arc->count == 0
+	    || !linfo.has_block (w))
 	  continue;
 
 	size_t index