Commits on Sep 23, 2024

1. Accelerate Unsafe CAS Intrinsics on Power and X …

   Adds support for the following recognized methods:
   CompareAndExchangeObject     //JDK11
   CompareAndExchangeReference  //JDK17,21
   CompareAndExchangeInt        //JDK11,17,21
   CompareAndExchangeLong       //JDK11,17,21
   
   Similar to their CompareAndSet counterparts, the JIT acceleration does
   not support CAE on static fields so the createUnsafeCASCallDiamond
   function was updated to also work on the CAE methods.
   
   The accelerated CAE code was built on top of the existing accelerated
   CAS support on both Power and X.
   
   Removed recognized CAS enums from isUnsafePut. They are not Unsafe put
   methods and these cases could not be triggered.
   
   Even before my changes, setting TR_UseOldCompareAndSwapObject and
   TR_DisableCASInlining would cause a crash on x. It doesn't really make
   sense to set both at the same time but I fixed it anyways since it was
   quick.
   
   VMwrtbarWithoutStoreEvaluator is used for several different opcdes
   include arraycopy, ArrayStoreCHK, writeBarrier and Unsafe CAS calls.
   This is only used for the Unsafe CAS calls that store an object.
   
   To differtiate Unsafe CAS calls from the other cases, there is a check
   for the node being an icall. This check is no longer valid with the
   introduction of support for compareAndExchangeReference. The node in
   this case is an acall.
   
   This changes the check to a generic call check. There is also a check
   for the call being to a recognized method. This check now checks for
   specific recognized methods which are:
   
   sun_misc_Unsafe_compareAndSwapObject_jlObjectJjlObjectjlObject_Z
   jdk_internal_misc_Unsafe_compareAndExchangeObject
   jdk_internal_misc_Unsafe_compareAndExchangeReference
   
   Signed-off-by: jimmyk <[email protected]>

   

   IBMJimmyk committed Sep 23, 2024
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