| 1//===--- ScheduleDAGSDNodes.cpp - Implement the ScheduleDAGSDNodes class --===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// --- 205 unchanged lines hidden (view full) --- 214 215 // Look for other loads of the same chain. Find loads that are loading from 216 // the same base pointer and different offsets. 217 SmallPtrSet<SDNode*, 16> Visited; 218 SmallVector<int64_t, 4> Offsets; 219 DenseMap<long long, SDNode*> O2SMap; // Map from offset to SDNode. 220 bool Cluster = false; 221 SDNode *Base = Node; |
| 222 // This algorithm requires a reasonably low use count before finding a match 223 // to avoid uselessly blowing up compile time in large blocks. 224 unsigned UseCount = 0; |
| 225 for (SDNode::use_iterator I = Chain->use_begin(), E = Chain->use_end(); |
| 226 I != E && UseCount < 100; ++I, ++UseCount) { |
| 227 SDNode *User = *I; 228 if (User == Node || !Visited.insert(User)) 229 continue; 230 int64_t Offset1, Offset2; 231 if (!TII->areLoadsFromSameBasePtr(Base, User, Offset1, Offset2) || 232 Offset1 == Offset2) 233 // FIXME: Should be ok if they addresses are identical. But earlier 234 // optimizations really should have eliminated one of the loads. 235 continue; 236 if (O2SMap.insert(std::make_pair(Offset1, Base)).second) 237 Offsets.push_back(Offset1); 238 O2SMap.insert(std::make_pair(Offset2, User)); 239 Offsets.push_back(Offset2); 240 if (Offset2 < Offset1) 241 Base = User; 242 Cluster = true; |
| 243 // Reset UseCount to allow more matches. 244 UseCount = 0; |
| 245 } 246 247 if (!Cluster) 248 return; 249 250 // Sort them in increasing order. 251 std::sort(Offsets.begin(), Offsets.end()); 252 --- 660 unchanged lines hidden --- |