diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c0c8cff4b0f6..1906f53720ee 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-10-26  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/46167
+	* tree-vect-patterns.c (vect_recog_dot_prod_pattern): Check that there
+	is basic block for the statement.
+
 2010-10-26  Paul Koning  <ni1d@arrl.net>
 
 	* config/pdp11/pdp11.c (pdp11_f_format, pdp11_d_format): Update to
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 60655c387d5e..762ceead9306 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2010-10-26  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/46167
+	* gcc.dg/vect/O-pr46167.c: New.
+	* gcc.dg/vect/vect.exp: Run tests with -O.
+
 2010-10-26  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/44948
diff --git a/gcc/testsuite/gcc.dg/vect/O-pr46167.c b/gcc/testsuite/gcc.dg/vect/O-pr46167.c
new file mode 100644
index 000000000000..490ddd457260
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/O-pr46167.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+
+int foo (char c, int i)
+{
+  int s = 0;
+  while (i--)
+    s += c;
+  return s;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */
diff --git a/gcc/testsuite/gcc.dg/vect/vect.exp b/gcc/testsuite/gcc.dg/vect/vect.exp
index f50574038e89..748234849ca8 100644
--- a/gcc/testsuite/gcc.dg/vect/vect.exp
+++ b/gcc/testsuite/gcc.dg/vect/vect.exp
@@ -126,6 +126,11 @@ set O1_VECTCFLAGS $DEFAULT_VECTCFLAGS
 lappend O1_VECTCFLAGS "-O1"
 lappend O1_VECTCFLAGS "-fdump-tree-vect-details"
 
+global O_VECTCFLAGS
+set O_VECTCFLAGS $DEFAULT_VECTCFLAGS
+lappend O_VECTCFLAGS "-O"
+lappend O_VECTCFLAGS "-fdump-tree-vect-details"
+
 lappend DEFAULT_VECTCFLAGS "-O2"
 
 # Tests that should be run without generating dump info
@@ -287,6 +292,10 @@ dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/O3-*.\[cS\]]]  \
 dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/O1-*.\[cS\]]]  \
         "" $O1_VECTCFLAGS
 
+# With -O
+dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/O-*.\[cS\]]]  \
+        "" $O_VECTCFLAGS
+
 # -fno-tree-reassoc
 set VECT_SLP_CFLAGS $SAVED_VECT_SLP_CFLAGS
 lappend VECT_SLP_CFLAGS "-fno-tree-reassoc"
diff --git a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c
index ebe00d6210d3..a26cb0b69f6d 100644
--- a/gcc/tree-vect-patterns.c
+++ b/gcc/tree-vect-patterns.c
@@ -257,7 +257,7 @@ vect_recog_dot_prod_pattern (gimple last_stmt, tree *type_in, tree *type_out)
   stmt = SSA_NAME_DEF_STMT (oprnd0);
 
   /* It could not be the dot_prod pattern if the stmt is outside the loop.  */
-  if (!flow_bb_inside_loop_p (loop, gimple_bb (stmt)))
+  if (!gimple_bb (stmt) || !flow_bb_inside_loop_p (loop, gimple_bb (stmt)))
     return NULL;
 
   /* FORNOW.  Can continue analyzing the def-use chain when this stmt in a phi