[lworld] Move null check from method entry into i2c adapter (original) (raw)
Roland Westrelin rwestrel at redhat.com
Tue May 29 09:55:08 UTC 2018
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http://cr.openjdk.java.net/~thartmann/valhalla/lworld/adapternullcheck/
That was fast!
How is the change in sharedRuntime.cpp related to the null check change?
We could still have a null literal in the code so checks for non null arguments and an unconditional deoptimization is required.
Another related change to move null checks out of the common path would be to null check return values in the callee rather than the caller and then deoptimize the caller if it is compiled. That would require a runtime check in the interpreter but in new code we would statically know that a value being returned is not null and so would have no check (unless the value returned is a null literal).
Roland.
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