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* Allow `LocalVariable` to be assigned more than once This allows us to write flow controls like loops and if-elses with LocalVariables participating in phi nodes. * Add `GetLocalNumber` to operand
289 lines
8.9 KiB
C#
289 lines
8.9 KiB
C#
using ARMeilleure.Common;
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.State;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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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 readonly Dictionary<int, Operand> _map;
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private readonly BitMap _phiMasks;
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public DefMap()
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{
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_map = new Dictionary<int, Operand>();
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_phiMasks = new BitMap(RegisterConsts.TotalCount);
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}
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public bool TryAddOperand(int key, Operand operand)
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{
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return _map.TryAdd(key, operand);
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}
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public bool TryGetOperand(int key, out Operand operand)
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{
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return _map.TryGetValue(key, out operand);
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}
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public bool AddPhi(int key)
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{
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return _phiMasks.Set(key);
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}
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public bool HasPhi(int key)
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{
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return _phiMasks.IsSet(key);
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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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var globalDefs = new DefMap[cfg.Blocks.Count];
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var localDefs = new Operand[cfg.LocalsCount + RegisterConsts.TotalCount];
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var dfPhiBlocks = new Queue<BasicBlock>();
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for (BasicBlock block = cfg.Blocks.First; block != null; block = block.ListNext)
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{
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globalDefs[block.Index] = new DefMap();
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}
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// First pass, get all defs and locals uses.
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for (BasicBlock block = cfg.Blocks.First; block != null; block = block.ListNext)
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{
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for (Node node = block.Operations.First; node != null; node = node.ListNext)
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{
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if (node is not Operation operation)
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{
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continue;
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}
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for (int index = 0; index < operation.SourcesCount; index++)
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{
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Operand src = operation.GetSource(index);
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if (TryGetId(src, out int srcKey))
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{
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Operand local = localDefs[srcKey] ?? src;
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operation.SetSource(index, local);
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}
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}
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Operand dest = operation.Destination;
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if (TryGetId(dest, out int destKey))
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{
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Operand local = Local(dest.Type);
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localDefs[destKey] = local;
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operation.Destination = local;
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}
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}
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for (int key = 0; key < localDefs.Length; key++)
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{
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Operand local = localDefs[key];
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if (local is null)
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{
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continue;
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}
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globalDefs[block.Index].TryAddOperand(key, 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(key))
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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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Array.Clear(localDefs, 0, localDefs.Length);
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}
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// Second pass, rename variables with definitions on different blocks.
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for (BasicBlock block = cfg.Blocks.First; block != null; block = block.ListNext)
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{
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for (Node node = block.Operations.First; node != null; node = node.ListNext)
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{
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if (node is not Operation operation)
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{
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continue;
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}
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for (int index = 0; index < operation.SourcesCount; index++)
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{
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Operand src = operation.GetSource(index);
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if (TryGetId(src, out int key))
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{
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Operand local = localDefs[key];
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if (local is null)
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{
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local = FindDef(globalDefs, block, src);
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localDefs[key] = local;
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}
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operation.SetSource(index, local);
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}
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}
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}
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Array.Clear(localDefs, 0, localDefs.Length);
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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(GetId(operand)))
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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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int key = GetId(operand);
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if (defMap.TryGetOperand(key, out Operand lastDef))
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{
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return lastDef;
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}
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if (defMap.HasPhi(key))
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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(GetId(operand), 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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Node node = block.Operations.First;
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if (node != null)
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{
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while (node.ListNext is PhiNode)
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{
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node = node.ListNext;
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}
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}
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if (node 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 bool TryGetId(Operand operand, out int result)
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{
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if (operand is { Kind: OperandKind.Register })
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{
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Register reg = operand.GetRegister();
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if (reg.Type == RegisterType.Integer)
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{
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result = reg.Index;
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}
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else if (reg.Type == RegisterType.Vector)
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{
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result = 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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result = RegisterConsts.IntAndVecRegsCount + reg.Index;
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}
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else /* if (reg.Type == RegisterType.FpFlag) */
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{
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result = RegisterConsts.FpFlagsOffset + reg.Index;
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}
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return true;
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}
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else if (operand is { Kind: OperandKind.LocalVariable } && operand.GetLocalNumber() > 0)
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{
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result = RegisterConsts.TotalCount + operand.GetLocalNumber() - 1;
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return true;
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}
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result = -1;
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return false;
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}
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private static int GetId(Operand operand)
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{
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if (!TryGetId(operand, out int key))
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{
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Debug.Fail("OperandKind must be Register or a numbered LocalVariable.");
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}
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return key;
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}
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}
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} |