{"generic cse", "dse"},
	// cse substantially improves nilcheckelim efficacy
	{"generic cse", "nilcheckelim"},
	// allow deadcode to clean up after nilcheckelim
	{"nilcheckelim", "generic deadcode"},
	// nilcheckelim generates sequences of plain basic blocks
	{"nilcheckelim", "late fuse"},
	// nilcheckelim relies on opt to rewrite user nil checks
	{"opt", "nilcheckelim"},

				continue
			}
			sset.add(v.MemoryArg().ID) // record that v's memory arg is used
		}
		if v.Op == OpNilCheck {
			hasNilCheck = true
		}
	}
	if len(stores) == 0 || !hasNilCheck && f.pass.name == "nilcheckelim" {
		// there is no store, the order does not matter
		return values
	}

	// find last store, which is the one that is not used by other stores
	var last *Value
	for _, v := range stores {