nios2.c (nios2_emit_move_sequence): Call copy_rtx to avoid shared structure error.

2016-12-11  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* config/nios2/nios2.c (nios2_emit_move_sequence): Call copy_rtx
	to avoid shared structure error.

From-SVN: r243538

gcc/ChangeLog

+2016-12-11  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* config/nios2/nios2.c (nios2_emit_move_sequence): Call copy_rtx
+	to avoid shared structure error.
+
 2016-12-11  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	PR target/78695

gcc/config/nios2/nios2.c

@@ -2334,7 +2334,8 @@ nios2_emit_move_sequence (rtx *operands, machine_mode mode)
 	    from = nios2_legitimize_constant_address (from);
 	  if (CONSTANT_P (from))
 	    {
-	      emit_insn (gen_rtx_SET (to, gen_rtx_HIGH (Pmode, from)));
+	      emit_insn (gen_rtx_SET (to,
+				      gen_rtx_HIGH (Pmode, copy_rtx (from))));
 	      emit_insn (gen_rtx_SET (to, gen_rtx_LO_SUM (Pmode, to, from)));
 	      set_unique_reg_note (get_last_insn (), REG_EQUAL,
 				   copy_rtx (operands[1]));