diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4ae39c27ae1..ad8f931b825 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2011-09-12  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/50343
+	* tree-vect-patterns.c (vect_recog_dot_prod_pattern): Check
+	that the reduction is over an SSA name before checking its
+	definition.
+
 2011-09-11  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* config/cris/cris.md: Use match_test rather than eq/ne symbol_ref
diff --git a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c
index 0d788827513..7fc107cafa9 100644
--- a/gcc/tree-vect-patterns.c
+++ b/gcc/tree-vect-patterns.c
@@ -256,6 +256,8 @@ vect_recog_dot_prod_pattern (VEC (gimple, heap) **stmts, tree *type_in,
      we know that oprnd1 is the reduction variable (defined by a loop-header
      phi), and oprnd0 is an ssa-name defined by a stmt in the loop body.
      Left to check that oprnd0 is defined by a (widen_)mult_expr  */
+  if (TREE_CODE (oprnd0) != SSA_NAME)
+    return NULL;
 
   prod_type = half_type;
   stmt = SSA_NAME_DEF_STMT (oprnd0);