public class BusyCodeMotion
- extends BodyTransformer
Performs a partial redundancy elimination (= code motion). This is
done, by moving everycomputation as high as possible (it is
easy to show, that they are computationally optimal), and then
replacing the original computation by a reference to this new high
computation. This implies, that we introduce many new
helper-variables (that can easily be eliminated afterwards).
order to catch every redundant expression, this transformation must
be done on a graph without critical edges. Therefore the first
thing we do, is removing them. A subsequent pass can then easily
remove the synthetic nodes we have introduced.
The term "busy"
refers to the fact, that we always move computations as high
as possible. Even, if this is not necessary.
- See Also:
|Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
public BusyCodeMotion(Singletons.Global g)
public static BusyCodeMotion v()
protected void internalTransform(Body b,
- performs the busy code motion.
- Specified by:
internalTransform in class
b - the body on which to apply the transformation
phaseName - the phasename for this transform; not typically used by implementations.
opts - the actual computed options; a combination of default options and Scene specified options.