1 //===- PPCMachineScheduler.cpp - MI Scheduler for PowerPC -------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
15 DisableAddiLoadHeuristic("disable-ppc-sched-addi-load",
19     EnableAddiHeuristic("ppc-postra-bias-addi",
25   return Cand.SU->getInstr()->getOpcode() == PPC::ADDI ||  in isADDIInstr()
26          Cand.SU->getInstr()->getOpcode() == PPC::ADDI8;  in isADDIInstr()
37   if (isADDIInstr(FirstCand) && SecondCand.SU->getInstr()->mayLoad()) {  in biasAddiLoadCandidate()
38     TryCand.Reason = Stall;  in biasAddiLoadCandidate()
41   if (FirstCand.SU->getInstr()->mayLoad() && isADDIInstr(SecondCand)) {  in biasAddiLoadCandidate()
42     TryCand.Reason = NoCand;  in biasAddiLoadCandidate()
56     TryCand.Reason = NodeOrder;  in tryCandidate()
63     return TryCand.Reason != NoCand;  in tryCandidate()
66   if (DAG->isTrackingPressure() &&  in tryCandidate()
68                   RegExcess, TRI, DAG->MF))  in tryCandidate()
69     return TryCand.Reason != NoCand;  in tryCandidate()
71   // Avoid increasing the max critical pressure in the scheduled region.  in tryCandidate()
72   if (DAG->isTrackingPressure() &&  in tryCandidate()
74                   TryCand, Cand, RegCritical, TRI, DAG->MF))  in tryCandidate()
75     return TryCand.Reason != NoCand;  in tryCandidate()
81   // "tie-breaking" in nature.  in tryCandidate()
87     if (Rem.IsAcyclicLatencyLimited && !Zone->getCurrMOps() &&  in tryCandidate()
89       return TryCand.Reason != NoCand;  in tryCandidate()
92     if (tryLess(Zone->getLatencyStallCycles(TryCand.SU),  in tryCandidate()
93                 Zone->getLatencyStallCycles(Cand.SU), TryCand, Cand, Stall))  in tryCandidate()
94       return TryCand.Reason != NoCand;  in tryCandidate()
100   // This is a best effort to set things up for a post-RA pass. Optimizations  in tryCandidate()
104       Cand.AtTop ? DAG->getNextClusterSucc() : DAG->getNextClusterPred();  in tryCandidate()
106       TryCand.AtTop ? DAG->getNextClusterSucc() : DAG->getNextClusterPred();  in tryCandidate()
109     return TryCand.Reason != NoCand;  in tryCandidate()
115       return TryCand.Reason != NoCand;  in tryCandidate()
118   // Avoid increasing the max pressure of the entire region.  in tryCandidate()
119   if (DAG->isTrackingPressure() &&  in tryCandidate()
121                   Cand, RegMax, TRI, DAG->MF))  in tryCandidate()
122     return TryCand.Reason != NoCand;  in tryCandidate()
129       return TryCand.Reason != NoCand;  in tryCandidate()
133       return TryCand.Reason != NoCand;  in tryCandidate()
139       return TryCand.Reason != NoCand;  in tryCandidate()
142     if ((Zone->isTop() && TryCand.SU->NodeNum < Cand.SU->NodeNum) ||  in tryCandidate()
143         (!Zone->isTop() && TryCand.SU->NodeNum > Cand.SU->NodeNum)) {  in tryCandidate()
144       TryCand.Reason = NodeOrder;  in tryCandidate()
152   if (TryCand.Reason != NodeOrder && TryCand.Reason != NoCand)  in tryCandidate()
159       return TryCand.Reason != NoCand;  in tryCandidate()
162   return TryCand.Reason != NoCand;  in tryCandidate()
171     TryCand.Reason = Stall;  in biasAddiCandidate()
183     TryCand.Reason = NodeOrder;  in tryCandidate()
190     return TryCand.Reason != NoCand;  in tryCandidate()
193   if (tryGreater(TryCand.SU == DAG->getNextClusterSucc(),  in tryCandidate()
194                  Cand.SU == DAG->getNextClusterSucc(), TryCand, Cand, Cluster))  in tryCandidate()
195     return TryCand.Reason != NoCand;  in tryCandidate()
200     return TryCand.Reason != NoCand;  in tryCandidate()
204     return TryCand.Reason != NoCand;  in tryCandidate()
208     return TryCand.Reason != NoCand;  in tryCandidate()
212   if (TryCand.SU->NodeNum < Cand.SU->NodeNum)  in tryCandidate()
213     TryCand.Reason = NodeOrder;  in tryCandidate()
219   if (TryCand.Reason != NodeOrder && TryCand.Reason != NoCand)  in tryCandidate()
227     return TryCand.Reason != NoCand;  in tryCandidate()
229   return TryCand.Reason != NoCand;  in tryCandidate()