Method kill

chapter21/src/main/java/com/seaofnodes/simple/node/Node.java:256–268

Kill a Node with no uses , by setting all of its defs to null. This may recursively kill more Nodes, and is basically dead code elimination.

( )

            nnn.addUse(n);
            CODE.addAll(n._outputs);
        }
        kill();
    }

    // insert `this` immediately after `def` in the same basic block.
    public void insertAfter( Node def ) {
        CFGNode cfg = def.cfg0();
        int i = cfg._outputs.find(def)+1;
        if( cfg instanceof CallEndNode ) {
            cfg = cfg.uctrl();  i=0;
        } else if( def.in(0) instanceof MultiNode ) {
            assert i==0;
            i = cfg._outputs.find(def.in(0))+1;
        }

        while( cfg.out(i) instanceof PhiNode || cfg.out(i) instanceof CalleeSaveNode )  i++;