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From "Natalya Golovleva" <natalya.golovl...@gmail.com>
Subject [drlvm][jit][ia-32]escape analysis based scalar replacement
Date Fri, 17 Nov 2006 11:21:26 GMT
Hello all,

JIT Development Tasks list among other tasks contains new optimization - 
EA-based scalar replacement.

EA determinates for every reference object used in the method its state: 
local, argument escaped and global escaped.

Escape analysis (EA) is already committed to harmony.

Scalar replacement optimization may be done for local objects (class 
instances and arrays) that satisfy to:

-        class should not have finalizer, class instance initializer should 
not have side effects;

-        optimized array may have only one array element usage.

I am going to implement EA-based scalar replacement for IA-32.

The proposal is:

  1.. to perform scalar replacement for specified above local objects.
  2.. using devirtualization and inlining change method code to create the 
object only when it is used as a parameter of virtual call and perform 
scalar replacement for branches with inlined direct calls.

Any comments are welcome.

Thank you,


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