Method addDep

chapter24/src/main/java/com/seaofnodes/simple/node/Node.java:557–567

Add a node to the list of dependencies. Only add it if it's not an input or output of this node, that is, it is at least one step away. The node being added must benefit from this node being peepholed.

( N dep )

     * being added must benefit from this node being peepholed.
     */
    <N extends Node> N addDep( N dep ) {
        // Running peepholes during the big assert cannot have side effects
        // like adding dependencies.
        if( CODE._midAssert ) return dep;
        if( dep._deps==null ) dep._deps = new Ary<>(Node.class);
        if( dep._deps   .find(this) != -1 ) return dep; // Already on list
        if( dep._inputs .find(this) != -1 ) return dep; // No need for deps on immediate neighbors
        if( dep._outputs.find(this) != -1 ) return dep;
        dep._deps.add(this);
        return dep;
    }

    // Move the dependents onto a worklist, and clear for future dependents.
    public void moveDepsToWorklist( ) { moveDepsToWorklist(CODE._iter); }