eliminating null pointer checks on mmu-less machines

Mon Sep 15 10:57:00 GMT 2003

Tom Tromey writes:
 > >>>>> "Adam" == Adam Megacz <adam@megacz.com> writes:
 > 
 > Adam> Hey, I was thinking about NullPointerException handling on machines
 > Adam> with no MMU. There's not much that can be done for field accesses,
 > Adam> but method invocations are much more common.
 > 
 > How good a job does the optimizer do at eliminating redundant checks?
It does well -- this is a common optimization for all languages with
pointers. What we don't do at all well is eliminating array bounds
checks.
Andrew.