JDK-8152753 : C1 intrinsics for CompareAndExchange (x86)
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9,10
  • Priority: P3
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2016-03-25
  • Updated: 2018-10-05
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8141635 - Implement VarHandles/Unsafe intrinsics on POWER
Relates :  
JDK-8141634 - Implement VarHandles/Unsafe intrinsics on SPARC
Relates :  
JDK-8141633 - Implement VarHandles/Unsafe intrinsics on AArch64
Description
Most new Unsafe methods delegate to stronger variants in Unsafe.java, with the exception of new CompareAndExchange methods. compareAndExchange cannot be emulated with existing APIs. We need to intrinsify compareAndExchange methods separately.
Comments
We are running in test problems plugging this into C1: unexpected test failures caused by LinearScan, LIRGenerators, etc. Given that this work is not affecting peak performance, we are moving it to past JDK 9 GA.
19-05-2016
Webrev: http://cr.openjdk.java.net/~shade/8152753/webrev.02/
08-04-2016