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293 lines
9.1 KiB
C#
293 lines
9.1 KiB
C#
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using ARMeilleure.Common;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.State;
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using System.Collections.Generic;
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using static ARMeilleure.IntermediateRepresentation.OperandHelper;
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namespace ARMeilleure.Translation
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{
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static partial class Ssa
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{
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private class DefMap
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{
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private Dictionary<Register, Operand> _map;
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private BitMap _phiMasks;
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public DefMap()
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{
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_map = new Dictionary<Register, Operand>();
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_phiMasks = new BitMap(RegisterConsts.TotalCount);
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}
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public bool TryAddOperand(Register reg, Operand operand)
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{
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return _map.TryAdd(reg, operand);
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}
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public bool TryGetOperand(Register reg, out Operand operand)
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{
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return _map.TryGetValue(reg, out operand);
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}
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public bool AddPhi(Register reg)
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{
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return _phiMasks.Set(GetIdFromRegister(reg));
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}
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public bool HasPhi(Register reg)
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{
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return _phiMasks.IsSet(GetIdFromRegister(reg));
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}
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}
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public static void Construct(ControlFlowGraph cfg)
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{
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DefMap[] globalDefs = new DefMap[cfg.Blocks.Count];
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foreach (BasicBlock block in cfg.Blocks)
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{
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globalDefs[block.Index] = new DefMap();
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}
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Queue<BasicBlock> dfPhiBlocks = new Queue<BasicBlock>();
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// First pass, get all defs and locals uses.
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foreach (BasicBlock block in cfg.Blocks)
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{
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Operand[] localDefs = new Operand[RegisterConsts.TotalCount];
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LinkedListNode<Node> node = block.Operations.First;
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Operand RenameLocal(Operand operand)
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{
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if (operand != null && operand.Kind == OperandKind.Register)
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{
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Operand local = localDefs[GetIdFromRegister(operand.GetRegister())];
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operand = local ?? operand;
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}
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return operand;
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}
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while (node != null)
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{
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if (node.Value is Operation operation)
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{
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for (int index = 0; index < operation.SourcesCount; index++)
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{
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operation.SetSource(index, RenameLocal(operation.GetSource(index)));
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}
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Operand dest = operation.Destination;
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if (dest != null && dest.Kind == OperandKind.Register)
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{
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Operand local = Local(dest.Type);
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localDefs[GetIdFromRegister(dest.GetRegister())] = local;
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operation.Destination = local;
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}
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}
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node = node.Next;
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}
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for (int index = 0; index < RegisterConsts.TotalCount; index++)
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{
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Operand local = localDefs[index];
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if (local == null)
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{
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continue;
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}
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Register reg = GetRegisterFromId(index);
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globalDefs[block.Index].TryAddOperand(reg, local);
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dfPhiBlocks.Enqueue(block);
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while (dfPhiBlocks.TryDequeue(out BasicBlock dfPhiBlock))
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{
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foreach (BasicBlock domFrontier in dfPhiBlock.DominanceFrontiers)
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{
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if (globalDefs[domFrontier.Index].AddPhi(reg))
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{
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dfPhiBlocks.Enqueue(domFrontier);
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}
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}
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}
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}
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}
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// Second pass, rename variables with definitions on different blocks.
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foreach (BasicBlock block in cfg.Blocks)
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{
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Operand[] localDefs = new Operand[RegisterConsts.TotalCount];
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LinkedListNode<Node> node = block.Operations.First;
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Operand RenameGlobal(Operand operand)
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{
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if (operand != null && operand.Kind == OperandKind.Register)
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{
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int key = GetIdFromRegister(operand.GetRegister());
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Operand local = localDefs[key];
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if (local == null)
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{
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local = FindDef(globalDefs, block, operand);
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localDefs[key] = local;
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}
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operand = local;
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}
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return operand;
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}
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while (node != null)
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{
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if (node.Value is Operation operation)
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{
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for (int index = 0; index < operation.SourcesCount; index++)
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{
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operation.SetSource(index, RenameGlobal(operation.GetSource(index)));
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}
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}
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node = node.Next;
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}
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}
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}
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private static Operand FindDef(DefMap[] globalDefs, BasicBlock current, Operand operand)
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{
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if (globalDefs[current.Index].HasPhi(operand.GetRegister()))
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{
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return InsertPhi(globalDefs, current, operand);
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}
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if (current != current.ImmediateDominator)
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{
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return FindDefOnPred(globalDefs, current.ImmediateDominator, operand);
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}
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return Undef();
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}
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private static Operand FindDefOnPred(DefMap[] globalDefs, BasicBlock current, Operand operand)
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{
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BasicBlock previous;
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do
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{
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DefMap defMap = globalDefs[current.Index];
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Register reg = operand.GetRegister();
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if (defMap.TryGetOperand(reg, out Operand lastDef))
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{
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return lastDef;
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}
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if (defMap.HasPhi(reg))
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{
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return InsertPhi(globalDefs, current, operand);
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}
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previous = current;
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current = current.ImmediateDominator;
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}
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while (previous != current);
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return Undef();
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}
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private static Operand InsertPhi(DefMap[] globalDefs, BasicBlock block, Operand operand)
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{
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// This block has a Phi that has not been materialized yet, but that
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// would define a new version of the variable we're looking for. We need
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// to materialize the Phi, add all the block/operand pairs into the Phi, and
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// then use the definition from that Phi.
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Operand local = Local(operand.Type);
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PhiNode phi = new PhiNode(local, block.Predecessors.Count);
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AddPhi(block, phi);
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globalDefs[block.Index].TryAddOperand(operand.GetRegister(), local);
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for (int index = 0; index < block.Predecessors.Count; index++)
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{
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BasicBlock predecessor = block.Predecessors[index];
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phi.SetBlock(index, predecessor);
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phi.SetSource(index, FindDefOnPred(globalDefs, predecessor, operand));
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}
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return local;
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}
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private static void AddPhi(BasicBlock block, PhiNode phi)
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{
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LinkedListNode<Node> node = block.Operations.First;
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if (node != null)
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{
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while (node.Next?.Value is PhiNode)
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{
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node = node.Next;
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}
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}
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if (node?.Value is PhiNode)
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{
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block.Operations.AddAfter(node, phi);
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}
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else
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{
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block.Operations.AddFirst(phi);
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}
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}
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private static int GetIdFromRegister(Register reg)
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{
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if (reg.Type == RegisterType.Integer)
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{
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return reg.Index;
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}
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else if (reg.Type == RegisterType.Vector)
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{
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return RegisterConsts.IntRegsCount + reg.Index;
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}
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else /* if (reg.Type == RegisterType.Flag) */
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{
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return RegisterConsts.IntAndVecRegsCount + reg.Index;
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}
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}
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private static Register GetRegisterFromId(int id)
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{
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if (id < RegisterConsts.IntRegsCount)
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{
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return new Register(id, RegisterType.Integer);
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}
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else if (id < RegisterConsts.IntAndVecRegsCount)
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{
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return new Register(id - RegisterConsts.IntRegsCount, RegisterType.Vector);
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}
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else /* if (id < RegisterConsts.TotalCount) */
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{
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return new Register(id - RegisterConsts.IntAndVecRegsCount, RegisterType.Flag);
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}
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}
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}
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}
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