1130   Optional<unsigned> bestDstLoopDepth = None;  in isFusionProfitable()  local
1228       bestDstLoopDepth = i;  in isFusionProfitable()
1236   if (!bestDstLoopDepth) {  in isFusionProfitable()
1244   if (!bestDstLoopDepth) {  in isFusionProfitable()
1250   *dstLoopDepth = *bestDstLoopDepth;  in isFusionProfitable()
1254                    << "\n  best loop depth: " << bestDstLoopDepth  in isFusionProfitable()
1549           unsigned bestDstLoopDepth = maxLegalFusionDepth;  in fuseProducerConsumerNodes()  local
1570                                          maxLegalFusionDepth, &bestDstLoopDepth,  in fuseProducerConsumerNodes()
1575           assert(bestDstLoopDepth > 0 && "Unexpected loop fusion depth");  in fuseProducerConsumerNodes()
1577               depthSliceUnions[bestDstLoopDepth - 1];  in fuseProducerConsumerNodes()
1625                      << " at depth " << bestDstLoopDepth << ":\n"  in fuseProducerConsumerNodes()
1657                   dstAffineForOp, storesForMemref[0], bestDstLoopDepth,  in fuseProducerConsumerNodes()
1776       unsigned bestDstLoopDepth = maxLegalFusionDepth;  in fuseWithSiblingNodes()  local
1781                                 &bestDstLoopDepth, computeToleranceThreshold))  in fuseWithSiblingNodes()
1785       assert(bestDstLoopDepth > 0 && "Unexpected loop fusion depth");  in fuseWithSiblingNodes()
1786       assert(!depthSliceUnions[bestDstLoopDepth - 1].isEmpty() &&  in fuseWithSiblingNodes()
1791       bool isInnermostInsertion = (bestDstLoopDepth == dstLoopDepthTest);  in fuseWithSiblingNodes()
1794                       depthSliceUnions[bestDstLoopDepth - 1],  in fuseWithSiblingNodes()