API to create a new Allocate node?

[Cesar Soares Lucas]

Thank you for taking the time to write a detailed explanation, John. That helps a lot!

One thing that perhaps I left implicit in my original comment: this new allocation shouldn't be part of the final code emitted by C2. The allocation will be used just to remove the phi node merging other objects and therefore EA+SR should be able to remove all allocations involved. Please, take a look at the example below.

C2 can't remove the allocations in the code below because of the Phi merging the objects:

if (...)
   p0 = new Point();
else
   p1 = new Point();
p = phi(p0, p1);
return p.x;

What I'm proposing is to replace the Phi *temporarily* with an allocation like shown below. C2 should be able to scalar replace all three objects in the example.

if (...)
   p0 = new Point(0);
else
   p1 = new Point(1);
p = new Point(phi(p0.x, p1.x));
return p.x;

In the final code we shouldn't have any allocation (and so no need to pick up a JVMS?!):

if (...)
   x0 = 0;
else
   x1 = 1;
px = phi(x0, x1);
return px;


Best regards,
Cesar