On 23/03/2023 11:39 am, David Crayford wrote:
FYI, the OpenJ9 JIT can implement JIT intrinsics to generate native
decimal instructions when running on z/OS. IBM have open source OpenJ9
and OMR so you can snoop around the code
https://github.com/eclipse-openj9/openj9/blob/master/jcl/src/openj9.dataaccess/share/classes/com/ibm/dataaccess/DecimalData.java
More interesting is:
https://github.com/eclipse-openj9/openj9/blob/master/jcl/src/java.base/share/classes/com/ibm/jit/BigDecimalExtension.java
since that implies DFP is used for BigDecimal calculations.
However, BigDecimal is immutable so by specification calculations create
a new object for every intermediate value. Hopefully the compiler can
optimize away most of them, if you require maximum performance.
--
Andrew Rowley
Black Hill Software
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