As suggested by Jakub this adds the missing combination.

Bootstrapped / tested on x86_64-unknown-linux-gnu, applied.

Richard.

2016-03-01  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/69994
        * tree-ssa-reassoc.c (ops_equal_values_p): Handle missing case.

Index: gcc/tree-ssa-reassoc.c
===================================================================
--- gcc/tree-ssa-reassoc.c      (revision 233840)
+++ gcc/tree-ssa-reassoc.c      (working copy)
@@ -649,6 +649,7 @@ ops_equal_values_p (tree op1, tree op2)
   if (op1 == op2)
     return true;
 
+  tree orig_op1 = op1;
   if (TREE_CODE (op1) == SSA_NAME)
     {
       gimple *stmt = SSA_NAME_DEF_STMT (op1);
@@ -666,7 +667,8 @@ ops_equal_values_p (tree op1, tree op2)
       if (gimple_nop_conversion_p (stmt))
        {
          op2 = gimple_assign_rhs1 (stmt);
-         if (op1 == op2)
+         if (op1 == op2
+             || orig_op1 == op2)
            return true;
        }
     }

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