JDK-8252482 : disable cbcond instructions on SPARC64
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 7,8,11
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: solaris
  • CPU: sparc
  • Submitted: 2020-08-28
  • Updated: 2021-09-24
  • Resolved: 2021-03-17
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JDK 11 JDK 7 JDK 8
11.0.11.0.1-oracleFixed 7u301Fixed 8u291Fixed
Description
We will disable usage of cbcond instructions on all SPARC64 CPUs.
Comments
Verified by David Buck.
24-05-2021

As opposed to completely disabling cbcond, we make UseCBCond default to false when: JDK 7/8: is_sparc64() returns true JDK 11: if any of the three Athena instruction sets are supported As the only SPARC64 chips that support cbcond also all support at least 2 (gen1 and gen2) of the Athena instruction extensions, in effect the JDK 11 change disables cbcond for all SPARC64 platforms. These changes only impact Fujitsu's SPARC64 CPUs. Cbcond remains enabled by default on Oracle's SPARC CPUs.
17-03-2021