1 //===--------------------- ResourceManager.cpp ------------------*- C++ -*-===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// The classes here represent processor resource units and their management
13 //===----------------------------------------------------------------------===//
23 #define DEBUG_TYPE "llvm-mca"
30   NextInSequenceMask &= (CandidateMask | (CandidateMask - 1));  in selectImpl()
73     ResourceSizeMask = (1ULL << Desc.NumUnits) - 1;  in ResourceState()
76   AvailableSlots = BufferSize == -1 ? 0U : static_cast<unsigned>(BufferSize);  in ResourceState()
112     : Resources(SM.getNumProcResourceKinds() - 1),  in ResourceManager()
113       Strategies(SM.getNumProcResourceKinds() - 1),  in ResourceManager()
114       Resource2Groups(SM.getNumProcResourceKinds() - 1, 0),  in ResourceManager()
116       ResIndex2ProcResID(SM.getNumProcResourceKinds() - 1, 0),  in ResourceManager()
145     Mask -= GroupMaskIdx;  in ResourceManager()
148       uint64_t Unit = Mask & (-Mask);  in ResourceManager()
171   return Resources[getResourceStateIndex(ResourceID)]->getNumUnits();  in getNumUnits()
176 // Second, is the specific sub-resource ID.
181   assert(RS.isReady() && "No available units to select!");  in selectPipe()
188   uint64_t SubResourceID = Strategies[Index]->select(RS.getReadyMask());  in selectPipe()
195   // Mark the sub-resource referenced by RR as used.  in use()
199   // Remember to update the resource strategy for non-group resources with  in use()
200   // multiple units.  in use()
202     Strategies[RSID]->used(RR.second);  in use()
204   // If there are still available units in RR.first,  in use()
215     unsigned GroupIndex = getResourceStateIndex(Users & (-Users));  in use()
218     Strategies[GroupIndex]->used(RR.first);  in use()
220     Users &= Users - 1;  in use()
237     unsigned GroupIndex = getResourceStateIndex(Users & (-Users));  in release()
240     Users &= Users - 1;  in release()
255     uint64_t CurrentBuffer = ConsumedBuffers & (-ConsumedBuffers);  in reserveBuffers()
264       // We do this to simulate an in-order dispatch/issue of instructions.  in reserveBuffers()
273     uint64_t CurrentBuffer = ConsumedBuffers & (-ConsumedBuffers);  in releaseBuffers()
297       NumAvailableUnits -= NumUnits;  in checkAvailability()
328         unsigned NumUnits = llvm::popcount(Resources[Index]->getReadyMask());  in checkAvailability()
333       if (!it->second) {  in checkAvailability()
334         BusyResourceMask |= it->first;  in checkAvailability()
338       it->second--;  in checkAvailability()
339       if (!it->second)  in checkAvailability()
340         ConsumedResourceMask |= it->first;  in checkAvailability()
377       BR.second--;  in cycleEvent()