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Allow LocalVariable to be assigned more than once (#2288)

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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
This commit is contained in:
FICTURE7 2021-05-17 03:54:53 +04:00 committed by GitHub
parent 212e472c9f
commit c805542b29
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 47 additions and 16 deletions
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19
ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
View file

@ -83,9 +83,10 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
int intFreeRegisters = regMasks.IntAvailableRegisters;
int vecFreeRegisters = regMasks.VecAvailableRegisters;
BlockInfo[] blockInfo = new BlockInfo[cfg.Blocks.Count];
var blockInfo = new BlockInfo[cfg.Blocks.Count];
List<LocalInfo> locInfo = new List<LocalInfo>();
var locInfo = new List<LocalInfo>();
var locVisited = new HashSet<Operand>();
for (int index = cfg.PostOrderBlocks.Length - 1; index >= 0; index--)
{
@ -109,7 +110,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
if (source.Kind == OperandKind.LocalVariable)
{
locInfo[source.AsInt32() - 1].SetBlockIndex(block.Index);
locInfo[source.GetLocalNumber() - 1].SetBlockIndex(block.Index);
}
else if (source.Kind == OperandKind.Memory)
{
@ -117,12 +118,12 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
if (memOp.BaseAddress != null)
{
locInfo[memOp.BaseAddress.AsInt32() - 1].SetBlockIndex(block.Index);
locInfo[memOp.BaseAddress.GetLocalNumber() - 1].SetBlockIndex(block.Index);
}
if (memOp.Index != null)
{
locInfo[memOp.Index.AsInt32() - 1].SetBlockIndex(block.Index);
locInfo[memOp.Index.GetLocalNumber() - 1].SetBlockIndex(block.Index);
}
}
}
@ -135,9 +136,9 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
{
LocalInfo info;
if (dest.Value != 0)
if (!locVisited.Add(dest))
{
info = locInfo[dest.AsInt32() - 1];
info = locInfo[dest.GetLocalNumber() - 1];
}
else
{
@ -198,7 +199,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
void AllocateRegister(Operand source, MemoryOperand memOp, int srcIndex)
{
LocalInfo info = locInfo[source.AsInt32() - 1];
LocalInfo info = locInfo[source.GetLocalNumber() - 1];
info.UseCount++;
@ -317,7 +318,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
continue;
}
LocalInfo info = locInfo[dest.AsInt32() - 1];
LocalInfo info = locInfo[dest.GetLocalNumber() - 1];
if (info.UseCount == 0 && !info.PreAllocated)
{

2
ARMeilleure/CodeGen/RegisterAllocators/LinearScanAllocator.cs
View file

@ -976,7 +976,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
{
if (operand.Kind == OperandKind.LocalVariable)
{
return operand.AsInt32();
return operand.GetLocalNumber();
}
else if (operand.Kind == OperandKind.Register)
{

8
ARMeilleure/IntermediateRepresentation/Operand.cs
View file

@ -1,5 +1,6 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
namespace ARMeilleure.IntermediateRepresentation
@ -91,6 +92,13 @@ namespace ARMeilleure.IntermediateRepresentation
return new Register((int)Value & 0xffffff, (RegisterType)(Value >> 24));
}
public int GetLocalNumber()
{
Debug.Assert(Kind == OperandKind.LocalVariable);
return (int)Value;
}
public byte AsByte()
{
return (byte)Value;

4
ARMeilleure/Translation/ControlFlowGraph.cs
View file

@ -10,15 +10,17 @@ namespace ARMeilleure.Translation
private BasicBlock[] _postOrderBlocks;
private int[] _postOrderMap;
public int LocalsCount { get; }
public BasicBlock Entry { get; }
public IntrusiveList<BasicBlock> Blocks { get; }
public BasicBlock[] PostOrderBlocks => _postOrderBlocks;
public int[] PostOrderMap => _postOrderMap;
public ControlFlowGraph(BasicBlock entry, IntrusiveList<BasicBlock> blocks)
public ControlFlowGraph(BasicBlock entry, IntrusiveList<BasicBlock> blocks, int localsCount)
{
Entry = entry;
Blocks = blocks;
LocalsCount = localsCount;
Update(removeUnreachableBlocks: true);
}

20
ARMeilleure/Translation/EmitterContext.cs
View file

@ -12,6 +12,8 @@ namespace ARMeilleure.Translation
{
class EmitterContext
{
private int _localsCount;
private readonly Dictionary<Operand, BasicBlock> _irLabels;
private readonly IntrusiveList<BasicBlock> _irBlocks;
@ -23,6 +25,8 @@ namespace ARMeilleure.Translation
public EmitterContext()
{
_localsCount = 0;
_irLabels = new Dictionary<Operand, BasicBlock>();
_irBlocks = new IntrusiveList<BasicBlock>();
@ -30,6 +34,15 @@ namespace ARMeilleure.Translation
_nextBlockFreq = BasicBlockFrequency.Default;
}
public Operand AllocateLocal(OperandType type)
{
Operand local = Local(type);
local.NumberLocal(++_localsCount);
return local;
}
public Operand Add(Operand op1, Operand op2)
{
return Add(Instruction.Add, Local(op1.Type), op1, op2);
@ -223,9 +236,10 @@ namespace ARMeilleure.Translation
public Operand Copy(Operand dest, Operand op1)
{
if (dest.Kind != OperandKind.Register)
if (dest.Kind != OperandKind.Register &&
(dest.Kind != OperandKind.LocalVariable || dest.GetLocalNumber() == 0))
{
throw new ArgumentException($"Invalid dest operand kind \"{dest.Kind}\".");
throw new ArgumentException($"Destination operand must be a Register or a numbered LocalVariable.");
}
return Add(Instruction.Copy, dest, op1);
@ -670,7 +684,7 @@ namespace ARMeilleure.Translation
public ControlFlowGraph GetControlFlowGraph()
{
return new ControlFlowGraph(_irBlocks.First, _irBlocks);
return new ControlFlowGraph(_irBlocks.First, _irBlocks, _localsCount);
}
}
}

10
ARMeilleure/Translation/SsaConstruction.cs
View file

@ -45,7 +45,7 @@ namespace ARMeilleure.Translation
public static void Construct(ControlFlowGraph cfg)
{
var globalDefs = new DefMap[cfg.Blocks.Count];
var localDefs = new Operand[RegisterConsts.TotalCount];
var localDefs = new Operand[cfg.LocalsCount + RegisterConsts.TotalCount];
var dfPhiBlocks = new Queue<BasicBlock>();
@ -264,6 +264,12 @@ namespace ARMeilleure.Translation
return true;
}
else if (operand is { Kind: OperandKind.LocalVariable } && operand.GetLocalNumber() > 0)
{
result = RegisterConsts.TotalCount + operand.GetLocalNumber() - 1;
return true;
}
result = -1;
@ -274,7 +280,7 @@ namespace ARMeilleure.Translation
{
if (!TryGetId(operand, out int key))
{
Debug.Fail("OperandKind must be Register.");
Debug.Fail("OperandKind must be Register or a numbered LocalVariable.");
}
return key;