JDK-8164920 : ppc: enhancement of CRC32 intrinsic
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • CPU: ppc
  • Submitted: 2016-08-29
  • Updated: 2019-03-19
  • Resolved: 2016-09-22
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8u202Fixed 9 b140Fixed
Related Reports
Relates :  
The current CRC32 intrinsic for ppc64le (https://bugs.openjdk.java.net/browse/JDK-8164920) doesn't use vector instructions effectively. Based on Anton's assemblies (https://github.com/antonblanchard/crc32-vpmsum), performance of the intrinsic will be improved.
Approved. Only PPC64 code change.

FC Extension Request This is a significant ppc64-only performance improvement which will not affect any of the Oracle platforms in any way. Hiroshi has posted a webrev here: http://cr.openjdk.java.net/~gromero/8164920/01/ and sent out a request for review to the hs-comp mailing list: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-September/024346.html .

Volker, please, add "FC Extension Request" to your comment.