diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 69c633728f03..eb4e2122b935 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2011-11-19  Patrick Marlier  <patrick.marlier@gmail.com>
+
+	PR middle-end/51211
+	* tracer.c (ignore_bb_p): Don't copy GIMPLE_TRANSACTION.
+
 2011-11-19  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* expmed.c (store_bit_field_1): Revert bogus formatting change.
diff --git a/gcc/tracer.c b/gcc/tracer.c
index d3523b985b1c..602e7580d994 100644
--- a/gcc/tracer.c
+++ b/gcc/tracer.c
@@ -90,10 +90,19 @@ bb_seen_p (basic_block bb)
 static bool
 ignore_bb_p (const_basic_block bb)
 {
+  gimple g;
+
   if (bb->index < NUM_FIXED_BLOCKS)
     return true;
   if (optimize_bb_for_size_p (bb))
     return true;
+
+  /* A transaction is a single entry multiple exit region.  It must be
+     duplicated in its entirety or not at all.  */
+  g = last_stmt (CONST_CAST_BB (bb));
+  if (g && gimple_code (g) == GIMPLE_TRANSACTION)
+    return true;
+
   return false;
 }