Reflective case for Class::isInstance(Object) is backed by Runtime1::is_instance_of() which uses oopDesc::is_a() to do the job.
Consider improving the implementation based on backend functionality introduced byJDK-8331341.
hotspot/src/share/vm/c1/c1_LIRGenerator.cpp:
// Example: clazz.isInstance(object)
void LIRGenerator::do_isInstance(Intrinsic* x) {
...
// TODO could try to substitute this node with an equivalent InstanceOf
// if clazz is known to be a constant Class. This will pick up newly found
// constants after HIR construction. I'll leave this to a future change.
// as a first cut, make a simple leaf call to runtime to stay platform independent.
// could follow the aastore example in a future change.
Consider improving the implementation based on backend functionality introduced by
hotspot/src/share/vm/c1/c1_LIRGenerator.cpp:
// Example: clazz.isInstance(object)
void LIRGenerator::do_isInstance(Intrinsic* x) {
...
// TODO could try to substitute this node with an equivalent InstanceOf
// if clazz is known to be a constant Class. This will pick up newly found
// constants after HIR construction. I'll leave this to a future change.
// as a first cut, make a simple leaf call to runtime to stay platform independent.
// could follow the aastore example in a future change.
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JDK-8349686 [s390x] C1: Improve Class.isInstance intrinsic
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- links to
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Commit(master)
openjdk/jdk/b40f8eef
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Review(master)
openjdk/jdk/22491
(2 links to)