re PR tree-optimization/79578 (Unnecessary instructions in generated code)

	PR tree-optimization/79578
	* tree-ssa-dse.c (clear_bytes_written_by): Use OEP_ADDRESS_OF
	in call to operand_equal_p.

From-SVN: r245688

gcc/ChangeLog

+2017-02-23  Jeff Law  <law@redhat.com>
+
+	PR tree-optimization/79578
+	* tree-ssa-dse.c (clear_bytes_written_by): Use OEP_ADDRESS_OF
+	in call to operand_equal_p.
+
 2017-01-23  Dominique d'Humieres  <dominiq@lps.ens.fr>
 
 	PR target/71017

gcc/tree-ssa-dse.c

@@ -176,7 +176,7 @@ clear_bytes_written_by (sbitmap live_bytes, gimple *stmt, ao_ref *ref)
   /* Verify we have the same base memory address, the write
      has a known size and overlaps with REF.  */
   if (valid_ao_ref_for_dse (&write)
-      && operand_equal_p (write.base, ref->base, 0)
+      && operand_equal_p (write.base, ref->base, OEP_ADDRESS_OF)
       && write.size == write.max_size
       && ((write.offset < ref->offset
 	   && write.offset + write.size > ref->offset)