Hello!
Publication "Communication Optimizations for Distributed-Memory X10
Programs"
provides description "Scalar Replacement with Loop-Invariant Code Motion".
The code below shows "Scalar Replacement with Loop-Invariant Code Motion":
---------------------------------------------------------------------------------------------
1 Scalar Replacement with Loop-Invariant Code Motion
class T ...
...
val A = Rail.make[T](r);
// region r is a subset of region R
for(point i in R) {
val idx = f(i) % Places.MAX_PLACE;
async (Place.places(idx)) g(A(idx));
}
---------------------------------------------------------------------------------------------
(Code is inserted from publication "Communication Optimizations for
Distributed-Memory X10 Programs")
I wrote sample like above code, it is not optimized:
---------------------------------------------------------------------------------------------
import x10.regionarray.*;
class HelloWorld {
public static def func(x:Long) {
var sum:Long = x;
}
public static def main(Rail[String]) {
val r = Region.make(0..3999);
val A = new Rail[Long](r.size(), here.id);
// var start : Long = System.nanoTime();
// finish {
for (i:Point in r) {
val idx = i(0) % Place.MAX_PLACES;
at (Place.place(idx)) async func(A(idx));
}
// }
// var stop : Long = System.nanoTime();
// Console.OUT.printf("Size of Rail %d: %g ms\n", r.size(),
((stop-start) as Double) / 1e6);
}
}
---------------------------------------------------------------------------------------------
When i compile this program with option "OPTIMIZE_COMMUNICATIONS=true",
"Scalar Replacement with Loop-Invariant Code Motion" was not apply.
Could you answer to me, why didn't apply "Scalar Replacement with
Loop-Invariant Code Motion"?
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