Index: tree-vectorizer.c
===================================================================
*** tree-vectorizer.c	(revision 122176)
--- tree-vectorizer.c	(working copy)
*************** vect_is_simple_reduction (struct loop *l
*** 1935,1948 ****
    int op_type;
    tree operation, op1, op2;
    tree type;
  
    if (TREE_CODE (loop_arg) != SSA_NAME)
      {
        if (vect_print_dump_info (REPORT_DETAILS))
!         {
!           fprintf (vect_dump, "reduction: not ssa_name: ");
!           print_generic_expr (vect_dump, loop_arg, TDF_SLIM);
!         }
        return NULL_TREE;
      }
  
--- 1935,1969 ----
    int op_type;
    tree operation, op1, op2;
    tree type;
+   int nloop_uses;
+   tree name;
+   imm_use_iterator imm_iter;
+   use_operand_p use_p;
+ 
+   name = PHI_RESULT (phi);
+   nloop_uses = 0;
+   FOR_EACH_IMM_USE_FAST (use_p, imm_iter, name)
+     {
+       tree use_stmt = USE_STMT (use_p);
+       if (flow_bb_inside_loop_p (loop, bb_for_stmt (use_stmt))
+ 	  && vinfo_for_stmt (use_stmt)
+ 	  && !is_pattern_stmt_p (vinfo_for_stmt (use_stmt)))
+         nloop_uses++;
+       if (nloop_uses > 1)
+         {
+           if (vect_print_dump_info (REPORT_DETAILS))
+             fprintf (vect_dump, "reduction used in loop.");
+           return NULL_TREE;
+         }
+     }
  
    if (TREE_CODE (loop_arg) != SSA_NAME)
      {
        if (vect_print_dump_info (REPORT_DETAILS))
! 	{
! 	  fprintf (vect_dump, "reduction: not ssa_name: ");
! 	  print_generic_expr (vect_dump, loop_arg, TDF_SLIM);
! 	}
        return NULL_TREE;
      }
  
*************** vect_is_simple_reduction (struct loop *l
*** 1950,1968 ****
    if (!def_stmt)
      {
        if (vect_print_dump_info (REPORT_DETAILS))
!         fprintf (vect_dump, "reduction: no def_stmt.");
        return NULL_TREE;
      }
  
    if (TREE_CODE (def_stmt) != GIMPLE_MODIFY_STMT)
      {
        if (vect_print_dump_info (REPORT_DETAILS))
!         {
!           print_generic_expr (vect_dump, def_stmt, TDF_SLIM);
!         }
        return NULL_TREE;
      }
  
    operation = GIMPLE_STMT_OPERAND (def_stmt, 1);
    code = TREE_CODE (operation);
    if (!commutative_tree_code (code) || !associative_tree_code (code))
--- 1971,2004 ----
    if (!def_stmt)
      {
        if (vect_print_dump_info (REPORT_DETAILS))
! 	fprintf (vect_dump, "reduction: no def_stmt.");
        return NULL_TREE;
      }
  
    if (TREE_CODE (def_stmt) != GIMPLE_MODIFY_STMT)
      {
        if (vect_print_dump_info (REPORT_DETAILS))
!         print_generic_expr (vect_dump, def_stmt, TDF_SLIM);
        return NULL_TREE;
      }
  
+   name = GIMPLE_STMT_OPERAND (def_stmt, 0);
+   nloop_uses = 0;
+   FOR_EACH_IMM_USE_FAST (use_p, imm_iter, name)
+     {
+       tree use_stmt = USE_STMT (use_p);
+       if (flow_bb_inside_loop_p (loop, bb_for_stmt (use_stmt))
+ 	  && vinfo_for_stmt (use_stmt)
+ 	  && !is_pattern_stmt_p (vinfo_for_stmt (use_stmt)))
+ 	nloop_uses++;
+       if (nloop_uses > 1)
+ 	{
+ 	  if (vect_print_dump_info (REPORT_DETAILS))
+ 	    fprintf (vect_dump, "reduction used in loop.");
+ 	  return NULL_TREE;
+ 	}
+     }
+ 
    operation = GIMPLE_STMT_OPERAND (def_stmt, 1);
    code = TREE_CODE (operation);
    if (!commutative_tree_code (code) || !associative_tree_code (code))