/**
* Update the value graph to account for a given PI instruction.
*
* <p><b>PRECONDITION:</b> <code> s.operator == PI </code>
*
* @param s the instruction in question
*/
private void processPi(Instruction s) {
Register result = GuardedUnary.getResult(s).getRegister();
ValueGraphVertex v = findOrCreateVertex(result);
Operand val = GuardedUnary.getVal(s);
// bypass Move instructions that define the right-hand side
val = bypassMoves(val);
v.copyVertex(findOrCreateVertex(val));
}
/**
* Update the value graph to account for a given GuardedUnary instruction.
*
* <p><b>PRECONDITION:</b> <code> GuardedUnary.conforms(s); </code> Careful: we define two Guarded
* Unaries to be equivalent regardless of whether the guards are equivalent!
*
* @param s the instruction in question
*/
private void processGuardedUnary(Instruction s) {
// label the vertex corresponding to the result with the operator
RegisterOperand result = GuardedUnary.getResult(s);
ValueGraphVertex v = findOrCreateVertex(result.getRegister());
v.setLabel(s.operator(), 1);
// link node v to the operand it uses
Operand val = GuardedUnary.getVal(s);
// bypass Move instructions
val = bypassMoves(val);
link(v, findOrCreateVertex(val), 0);
}