RFR: 8213754: PPC64: Add Intrinsics for isDigit/isLowerCase/isUpperCase/isWhitespace

[Michihiro Horie]

Dear all,

Would you please review following change?

Bug: https://bugs.openjdk.java.net/browse/JDK-8213754
Webrev: http://cr.openjdk.java.net/~mhorie/8213754/webrev.00

This change includes the intrinsics of Character isDigit, isLowerCase,
isUpperCase, and isWhitespace to support the Latin1 block using POWER9’s
instructions cmprb and cmpeqb. The cmprb enables to compare a character
with 1 or 2 ranged bytes, while the cmpeqb compares one with 1 to 8 values.
Simple micro benchmark attached showed improvements by 20-40%.

(See attached file: Latin1Test.java)


Best regards,
--
Michihiro,
IBM Research - Tokyo
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