1 //===- RegisterClassInfo.cpp - Dynamic Register Class Info ----------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 // information about target register classes. Callee-saved vs. caller-saved and
14 //===----------------------------------------------------------------------===//
37 StressRA("stress-regalloc", cl::Hidden, cl::init(0), cl::value_desc("N"),
46   auto &STI = MF->getSubtarget();  in runOnMachineFunction()
51     RegClass.reset(new RCInfo[TRI->getNumRegClasses()]);  in runOnMachineFunction()
56   const MachineRegisterInfo &MRI = MF->getRegInfo();  in runOnMachineFunction()
82     // overlapping CSR.  in runOnMachineFunction()
83     CalleeSavedAliases.assign(TRI->getNumRegUnits(), 0);  in runOnMachineFunction()
85       for (MCRegUnit U : TRI->regunits(*I))  in runOnMachineFunction()
95   BitVector CSRHintsForAllocOrder(TRI->getNumRegs());  in runOnMachineFunction()
104   RegCosts = TRI->getRegisterCosts(*MF);  in runOnMachineFunction()
107   const BitVector &RR = MF->getRegInfo().getReservedRegs();  in runOnMachineFunction()
115     unsigned NumPSets = TRI->getNumRegPressureSets();  in runOnMachineFunction()
122 /// compute - Compute the preferred allocation order for RC with reserved
127   RCInfo &RCI = RegClass[RC->getID()];  in compute()
128   auto &STI = MF->getSubtarget();  in compute()
131   unsigned NumRegs = RC->getNumRegs();  in compute()
144   ArrayRef<MCPhysReg> RawOrder = RC->getRawAllocationOrder(*MF);  in compute()
179   // Check if RC is a proper sub-class.  in compute()
181           TRI->getLargestLegalSuperClass(RC, *MF))  in compute()
189     dbgs() << "AllocationOrder(" << TRI->getRegClassName(RC) << ") = [";  in compute()
192     dbgs() << (RCI.ProperSubClass ? " ] (sub-class)\n" : " ]\n");  in compute()
195   // RCI is now up-to-date.  in compute()
199 /// This is not accurate because two overlapping register sets may have some
205   for (const TargetRegisterClass *C : TRI->regclasses()) {  in computePSetLimit()
206     const int *PSetID = TRI->getRegClassPressureSets(C);  in computePSetLimit()
207     for (; *PSetID != -1; ++PSetID) {  in computePSetLimit()
211     if (*PSetID == -1)  in computePSetLimit()
216     unsigned NUnits = TRI->getRegClassWeight(C).WeightLimit;  in computePSetLimit()
225   unsigned RegPressureSetLimit = TRI->getRegPressureSetLimit(*MF, Idx);  in computePSetLimit()
229   // return non-zero value.  in computePSetLimit()
232   unsigned NReserved = RC->getNumRegs() - NAllocatableRegs;  in computePSetLimit()
233   return RegPressureSetLimit - TRI->getRegClassWeight(RC).RegWeight * NReserved;  in computePSetLimit()