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); } }