diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp index d7a9636..20a081d 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp @@ -1389,6 +1389,16 @@ void RegReductionPriorityQueue<SF>::AddPseudoTwoAddrDeps() { if (SuccSU->getHeight() < SU->getHeight() && (SU->getHeight() - SuccSU->getHeight()) > 1) continue; + // Skip past COPY_TO_REGCLASS nodes, so that the pseudo edge + // constrains whatever is using the copy, instead of the copy + // itself. In the case that the copy is coalesced, this + // preserves the intent of the pseudo two-address heurietics. + while (SuccSU->Succs.size() == 1 && + SuccSU->getNode()->isMachineOpcode() && + SuccSU->getNode()->getMachineOpcode() == + TargetInstrInfo::COPY_TO_REGCLASS) + SuccSU = SuccSU->Succs.front().getSUnit(); + // Don't constrain non-instruction nodes. if (!SuccSU->getNode() || !SuccSU->getNode()->isMachineOpcode()) continue; // Don't constrain nodes with physical register defs if the |