src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp

@@ -4858,10 +4858,12 @@
   Label CH1_LOOP, HAS_ZERO, DO1_SHORT, DO1_LOOP, MATCH, NOMATCH, DONE;
   Register cnt1_neg = cnt1;
   Register ch1 = rscratch1;
   Register result_tmp = rscratch2;
 
+  cbz(cnt1, NOMATCH);
+
   cmp(cnt1, (u1)4);
   br(LT, DO1_SHORT);
 
   orr(ch, ch, ch, LSL, 16);
   orr(ch, ch, ch, LSL, 32);