RFR (M) 8175368: [s390] Provide intrinsic implementation for CRC32C

[Schmidt, Lutz]

Hi all,

may I kindly request reviews for my medium enhancement? Further down the road, I would need a sponsor, too.

Bug: https://bugs.openjdk.java.net/browse/JDK-8175368
Webrev: http://cr.openjdk.java.net/~lucy/webrevs/8175368/<http://cr.openjdk.java.net/~lucy/webrevs/8175370/>

Description:
This intrinsic implementation provides some performance benefit over the standard Java implementation. It uses only well-known “standard” instructions, available on all supported IBM System z hardware. Being very similar to the CRC32 intrinsics, it was tried to share as much code as possible between these two.

Performance may be expected to increase up to 2.0x, compared to a run with –XX:-UseCRC32CIntrinsics. Actual speedup depends on the length of the byte array fed into CRC32C and, to some extent, on the H/W generation the test runs on.

Thanks,
Lutz

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