Examples with VISIBLE com.dat3m.dartagnan.program.event.Tag.VISIBLE used on opensource projects

Example 1 with VISIBLE

use of com.dat3m.dartagnan.program.event.Tag.VISIBLE in project Dat3M by hernanponcedeleon.

the class DeadAssignmentElimination method eliminateDeadStores.

private void eliminateDeadStores(Thread thread) {
    Set<Event> removed = new HashSet<>();
    // Registers that are used by other threads or assertions cannot be removed
    Set<Register> usedRegs = new HashSet<>();
    if (program.getAss() != null) {
        usedRegs.addAll(program.getAss().getRegs());
    }
    program.getCache().getEvents(FilterBasic.get(ASSERTION)).stream().filter(RegWriter.class::isInstance).map(RegWriter.class::cast).map(RegWriter::getResultRegister).forEach(usedRegs::add);
    program.getEvents().stream().filter(o -> !o.getThread().equals(thread)).filter(o -> o instanceof RegReaderData).forEach(o -> usedRegs.addAll(((RegReaderData) o).getDataRegs()));
    for (Event e : Lists.reverse(thread.getEvents())) {
        if (e instanceof RegWriter && !e.is(VISIBLE) && !usedRegs.contains(((RegWriter) e).getResultRegister())) {
            // Invisible RegWriters that write to an unused reg can get removed
            removed.add(e);
        }
        // An event that was not removed adds its dependencies to the used registers
        if (!removed.contains(e)) {
            if (e instanceof RegReaderData) {
                // Data & Ctrl dependencies
                usedRegs.addAll(((RegReaderData) e).getDataRegs());
            }
            if (e instanceof MemEvent) {
                // Address dependencies
                usedRegs.addAll(((MemEvent) e).getAddress().getRegs());
            }
        }
    }
    // Here is the actual removal
    Event pred = null;
    Event cur = thread.getEntry();
    while (cur != null) {
        if (removed.contains(cur) && !cur.is(Tag.NOOPT)) {
            cur.delete();
            cur = pred;
        }
        pred = cur;
        cur = cur.getSuccessor();
    }
}