The following functions should be intrinsics, because they can be optimized, their native performance is poor, and they are important either to known benchmarks or common uses of reflection.

Class.getComponentType, getSuperclass, isArray, isInterface, isPrimitive
Object.clone
Unsafe.copyMemory
Arrays.copyOf, copyOfRange
Array.getLength, newArray
Posted Date : 2007-02-16 02:25:30.0

N/A

Yes.

See Suggested Fix for a patch to Unsafe.java which provides new addressing modes for copyMemory and setMemory.

After these intrinsics are added to Unsafe, there may be a number of native methods in J2SE which should be coded in terms of compiler intrinsics (such as Unsafe.copyMemory and Integer.reverseBytes), so that the compiler and runtime system can properly optimize them.  See, for example, java.nio.Bits.copyFromByteArray.  The bug 4463011 talks about the optimization of NIO under the assumption that Unsafe.copyMemory would not be available.  Now it is.
Posted Date : 2007-04-21 23:29:32.0