avr.c (avr_out_compare): Use const0_rtx instead of 0 when testing for compares…

avr.c (avr_out_compare): Use const0_rtx instead of 0 when testing for compares against constants of the...

	* config/avr/avr.c (avr_out_compare): Use const0_rtx instead of 0
	when testing for compares against constants of the form 0xabab.

From-SVN: r238879

gcc/ChangeLog

+2016-07-29  Georg-Johann Lay  <avr@gjlay.de>
+
+	* config/avr/avr.c (avr_out_compare): Use const0_rtx instead of 0
+	when testing for compares against constants of the form 0xabab.
+
 2016-07-29  Bin Cheng  <bin.cheng@arm.com>
 
 	PR tree-optimization/57558

gcc/config/avr/avr.c

@@ -5357,7 +5357,7 @@ avr_out_compare (rtx_insn *insn, rtx *xop, int *plen)
      the constant is of the form 0xabab.  */
 
   if (n_bytes == 2
-      && xval != 0
+      && xval != const0_rtx
       && test_hard_reg_class (LD_REGS, xreg)
       && compare_eq_p (insn)
       && !reg_unused_after (insn, xreg))