public void reduceTrivialMerge(AbstractMergeNode merge) {
assert merge.forwardEndCount() == 1;
assert !(merge instanceof LoopBeginNode) || ((LoopBeginNode) merge).loopEnds().isEmpty();
for (PhiNode phi : merge.phis().snapshot()) {
assert phi.valueCount() == 1;
ValueNode singleValue = phi.valueAt(0);
phi.replaceAtUsagesAndDelete(singleValue);
}
// remove loop exits
if (merge instanceof LoopBeginNode) {
((LoopBeginNode) merge).removeExits();
}
AbstractEndNode singleEnd = merge.forwardEndAt(0);
FixedNode sux = merge.next();
FrameState stateAfter = merge.stateAfter();
// evacuateGuards
merge.prepareDelete((FixedNode) singleEnd.predecessor());
merge.safeDelete();
if (stateAfter != null && stateAfter.isAlive() && stateAfter.hasNoUsages()) {
GraphUtil.killWithUnusedFloatingInputs(stateAfter);
}
if (sux == null) {
singleEnd.replaceAtPredecessor(null);
singleEnd.safeDelete();
} else {
singleEnd.replaceAndDelete(sux);
}
}
