[PATCH] Fix PR50343

[Richard Guenther]

This fixes PR50343.

Committed as obvious.

Richard.

2011-09-12  Richard Guenther  <rguent...@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.

Index: gcc/tree-vect-patterns.c
===================================================================
--- gcc/tree-vect-patterns.c    (revision 178725)
+++ gcc/tree-vect-patterns.c    (working copy)
@@ -256,6 +256,8 @@ vect_recog_dot_prod_pattern (VEC (gimple
      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);