[aarch64-port-dev ] RFR: 8179933: aarch64: incorrect match rule for immL_63 and immL_255

[Zhongwei Yao]

Hi,
For now, "SubExtL_uxtb_and" instruction can not match following code:
  x -= (y & 255)
where x and y are both long type integer due to incorrect rule definition
of immL_255. Similar issue exists for immL_63.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8179933

Webrev:
http://cr.openjdk.java.net/~njian/8179933/webrev.00/

Please help to review it.

-- 
Best regards,
Zhongwei