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jinx/ARMeilleure/IntermediateRepresentation/Operand.cs
FICTURE7 312be74861
Optimize HybridAllocator (#2637)
* Store constant `Operand`s in the `LocalInfo`

Since the spill slot and register assigned is fixed, we can just store
the `Operand` reference in the `LocalInfo` struct. This allows skipping
hitting the intern-table for a look up.

* Skip `Uses`/`Assignments` management

Since the `HybridAllocator` is the last pass and we do not care about
uses/assignments we can skip managing that when setting destinations or
sources.

* Make `GetLocalInfo` inlineable

Also fix a possible issue where with numbered locals. See or-assignment
operator in `SetVisited(local)` before patch.

* Do not run `BlockPlacement` in LCQ

With the host mapped memory manager, there is a lot less cold code to
split from hot code. So disabling this in LCQ gives some extra
throughput - where we need it.

* Address Mou-Ikkai's feedback

* Apply suggestions from code review

Co-authored-by: VocalFan <45863583+Mou-Ikkai@users.noreply.github.com>

* Move check to an assert

Co-authored-by: VocalFan <45863583+Mou-Ikkai@users.noreply.github.com>
2021-09-29 01:38:37 +02:00

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16 KiB
C#

using ARMeilleure.CodeGen.Linking;
using ARMeilleure.Common;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
namespace ARMeilleure.IntermediateRepresentation
{
unsafe struct Operand : IEquatable<Operand>
{
internal struct Data
{
public byte Kind;
public byte Type;
public byte SymbolType;
public ushort AssignmentsCount;
public ushort AssignmentsCapacity;
public ushort UsesCount;
public ushort UsesCapacity;
public Operation* Assignments;
public Operation* Uses;
public ulong Value;
public ulong SymbolValue;
}
private Data* _data;
public OperandKind Kind
{
get => (OperandKind)_data->Kind;
private set => _data->Kind = (byte)value;
}
public OperandType Type
{
get => (OperandType)_data->Type;
private set => _data->Type = (byte)value;
}
public ulong Value
{
get => _data->Value;
private set => _data->Value = value;
}
public Symbol Symbol
{
get
{
Debug.Assert(Kind != OperandKind.Memory);
return new Symbol((SymbolType)_data->SymbolType, _data->SymbolValue);
}
private set
{
Debug.Assert(Kind != OperandKind.Memory);
if (value.Type == SymbolType.None)
{
_data->SymbolType = (byte)SymbolType.None;
}
else
{
_data->SymbolType = (byte)value.Type;
_data->SymbolValue = value.Value;
}
}
}
public ReadOnlySpan<Operation> Assignments
{
get
{
Debug.Assert(Kind != OperandKind.Memory);
return new ReadOnlySpan<Operation>(_data->Assignments, _data->AssignmentsCount);
}
}
public ReadOnlySpan<Operation> Uses
{
get
{
Debug.Assert(Kind != OperandKind.Memory);
return new ReadOnlySpan<Operation>(_data->Uses, _data->UsesCount);
}
}
public int UsesCount => _data->UsesCount;
public int AssignmentsCount => _data->AssignmentsCount;
public bool Relocatable => Symbol.Type != SymbolType.None;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public Register GetRegister()
{
Debug.Assert(Kind == OperandKind.Register);
return new Register((int)Value & 0xffffff, (RegisterType)(Value >> 24));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public MemoryOperand GetMemory()
{
Debug.Assert(Kind == OperandKind.Memory);
return new MemoryOperand(this);
}
public int GetLocalNumber()
{
Debug.Assert(Kind == OperandKind.LocalVariable);
return (int)Value;
}
public byte AsByte()
{
return (byte)Value;
}
public short AsInt16()
{
return (short)Value;
}
public int AsInt32()
{
return (int)Value;
}
public long AsInt64()
{
return (long)Value;
}
public float AsFloat()
{
return BitConverter.Int32BitsToSingle((int)Value);
}
public double AsDouble()
{
return BitConverter.Int64BitsToDouble((long)Value);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal ref ulong GetValueUnsafe()
{
return ref _data->Value;
}
internal void NumberLocal(int number)
{
if (Kind != OperandKind.LocalVariable)
{
throw new InvalidOperationException("The operand is not a local variable.");
}
Value = (ulong)number;
}
public void AddAssignment(Operation operation)
{
if (Kind == OperandKind.LocalVariable)
{
Add(operation, ref _data->Assignments, ref _data->AssignmentsCount, ref _data->AssignmentsCapacity);
}
else if (Kind == OperandKind.Memory)
{
MemoryOperand memOp = GetMemory();
Operand addr = memOp.BaseAddress;
Operand index = memOp.Index;
if (addr != default)
{
Add(operation, ref addr._data->Assignments, ref addr._data->AssignmentsCount, ref addr._data->AssignmentsCapacity);
}
if (index != default)
{
Add(operation, ref index._data->Assignments, ref index._data->AssignmentsCount, ref index._data->AssignmentsCapacity);
}
}
}
public void RemoveAssignment(Operation operation)
{
if (Kind == OperandKind.LocalVariable)
{
Remove(operation, ref _data->Assignments, ref _data->AssignmentsCount);
}
else if (Kind == OperandKind.Memory)
{
MemoryOperand memOp = GetMemory();
Operand addr = memOp.BaseAddress;
Operand index = memOp.Index;
if (addr != default)
{
Remove(operation, ref addr._data->Assignments, ref addr._data->AssignmentsCount);
}
if (index != default)
{
Remove(operation, ref index._data->Assignments, ref index._data->AssignmentsCount);
}
}
}
public void AddUse(Operation operation)
{
if (Kind == OperandKind.LocalVariable)
{
Add(operation, ref _data->Uses, ref _data->UsesCount, ref _data->UsesCapacity);
}
else if (Kind == OperandKind.Memory)
{
MemoryOperand memOp = GetMemory();
Operand addr = memOp.BaseAddress;
Operand index = memOp.Index;
if (addr != default)
{
Add(operation, ref addr._data->Uses, ref addr._data->UsesCount, ref addr._data->UsesCapacity);
}
if (index != default)
{
Add(operation, ref index._data->Uses, ref index._data->UsesCount, ref index._data->UsesCapacity);
}
}
}
public void RemoveUse(Operation operation)
{
if (Kind == OperandKind.LocalVariable)
{
Remove(operation, ref _data->Uses, ref _data->UsesCount);
}
else if (Kind == OperandKind.Memory)
{
MemoryOperand memOp = GetMemory();
Operand addr = memOp.BaseAddress;
Operand index = memOp.Index;
if (addr != default)
{
Remove(operation, ref addr._data->Uses, ref addr._data->UsesCount);
}
if (index != default)
{
Remove(operation, ref index._data->Uses, ref index._data->UsesCount);
}
}
}
private static void New<T>(ref T* data, ref ushort count, ref ushort capacity, ushort initialCapacity) where T : unmanaged
{
count = 0;
capacity = initialCapacity;
data = Allocators.References.Allocate<T>(initialCapacity);
}
private static void Add<T>(T item, ref T* data, ref ushort count, ref ushort capacity) where T : unmanaged
{
if (count < capacity)
{
data[(uint)count++] = item;
return;
}
// Could not add item in the fast path, fallback onto the slow path.
ExpandAdd(item, ref data, ref count, ref capacity);
static void ExpandAdd(T item, ref T* data, ref ushort count, ref ushort capacity)
{
ushort newCount = checked((ushort)(count + 1));
ushort newCapacity = (ushort)Math.Min(capacity * 2, ushort.MaxValue);
var oldSpan = new Span<T>(data, count);
capacity = newCapacity;
data = Allocators.References.Allocate<T>(capacity);
oldSpan.CopyTo(new Span<T>(data, count));
data[count] = item;
count = newCount;
}
}
private static void Remove<T>(in T item, ref T* data, ref ushort count) where T : unmanaged
{
var span = new Span<T>(data, count);
for (int i = 0; i < span.Length; i++)
{
if (EqualityComparer<T>.Default.Equals(span[i], item))
{
if (i + 1 < count)
{
span.Slice(i + 1).CopyTo(span.Slice(i));
}
count--;
return;
}
}
}
public override int GetHashCode()
{
if (Kind == OperandKind.LocalVariable)
{
return base.GetHashCode();
}
else
{
return (int)Value ^ ((int)Kind << 16) ^ ((int)Type << 20);
}
}
public bool Equals(Operand operand)
{
return operand._data == _data;
}
public override bool Equals(object obj)
{
return obj is Operand operand && Equals(operand);
}
public static bool operator ==(Operand a, Operand b)
{
return a.Equals(b);
}
public static bool operator !=(Operand a, Operand b)
{
return !a.Equals(b);
}
public static class Factory
{
private const int InternTableSize = 256;
private const int InternTableProbeLength = 8;
[ThreadStatic]
private static Data* _internTable;
private static Data* InternTable
{
get
{
if (_internTable == null)
{
_internTable = (Data*)NativeAllocator.Instance.Allocate((uint)sizeof(Data) * InternTableSize);
// Make sure the table is zeroed.
new Span<Data>(_internTable, InternTableSize).Clear();
}
return _internTable;
}
}
private static Operand Make(OperandKind kind, OperandType type, ulong value, Symbol symbol = default)
{
Debug.Assert(kind != OperandKind.None);
Data* data = null;
// If constant or register, then try to look up in the intern table before allocating.
if (kind == OperandKind.Constant || kind == OperandKind.Register)
{
uint hash = (uint)HashCode.Combine(kind, type, value);
// Look in the next InternTableProbeLength slots for a match.
for (uint i = 0; i < InternTableProbeLength; i++)
{
Operand interned = new();
interned._data = &InternTable[(hash + i) % InternTableSize];
// If slot matches the allocation request then return that slot.
if (interned.Kind == kind && interned.Type == type && interned.Value == value && interned.Symbol == symbol)
{
return interned;
}
// Otherwise if the slot is not occupied, we store in that slot.
else if (interned.Kind == OperandKind.None)
{
data = interned._data;
break;
}
}
}
// If we could not get a slot from the intern table, we allocate somewhere else and store there.
if (data == null)
{
data = Allocators.Operands.Allocate<Data>();
}
*data = default;
Operand result = new();
result._data = data;
result.Value = value;
result.Kind = kind;
result.Type = type;
if (kind != OperandKind.Memory)
{
result.Symbol = symbol;
}
// If local variable, then the use and def list is initialized with default sizes.
if (kind == OperandKind.LocalVariable)
{
New(ref result._data->Assignments, ref result._data->AssignmentsCount, ref result._data->AssignmentsCapacity, 1);
New(ref result._data->Uses, ref result._data->UsesCount, ref result._data->UsesCapacity, 4);
}
return result;
}
public static Operand Const(OperandType type, long value)
{
Debug.Assert(type is OperandType.I32 or OperandType.I64);
return type == OperandType.I32 ? Const((int)value) : Const(value);
}
public static Operand Const(bool value)
{
return Const(value ? 1 : 0);
}
public static Operand Const(int value)
{
return Const((uint)value);
}
public static Operand Const(uint value)
{
return Make(OperandKind.Constant, OperandType.I32, value);
}
public static Operand Const(long value)
{
return Const(value, symbol: default);
}
public static Operand Const<T>(ref T reference, Symbol symbol = default)
{
return Const((long)Unsafe.AsPointer(ref reference), symbol);
}
public static Operand Const(long value, Symbol symbol)
{
return Make(OperandKind.Constant, OperandType.I64, (ulong)value, symbol);
}
public static Operand Const(ulong value)
{
return Make(OperandKind.Constant, OperandType.I64, value);
}
public static Operand ConstF(float value)
{
return Make(OperandKind.Constant, OperandType.FP32, (ulong)BitConverter.SingleToInt32Bits(value));
}
public static Operand ConstF(double value)
{
return Make(OperandKind.Constant, OperandType.FP64, (ulong)BitConverter.DoubleToInt64Bits(value));
}
public static Operand Label()
{
return Make(OperandKind.Label, OperandType.None, 0);
}
public static Operand Local(OperandType type)
{
return Make(OperandKind.LocalVariable, type, 0);
}
public static Operand Register(int index, RegisterType regType, OperandType type)
{
return Make(OperandKind.Register, type, (ulong)((int)regType << 24 | index));
}
public static Operand Undef()
{
return Make(OperandKind.Undefined, OperandType.None, 0);
}
public static Operand MemoryOp(
OperandType type,
Operand baseAddress,
Operand index = default,
Multiplier scale = Multiplier.x1,
int displacement = 0)
{
Operand result = Make(OperandKind.Memory, type, 0);
MemoryOperand memory = result.GetMemory();
memory.BaseAddress = baseAddress;
memory.Index = index;
memory.Scale = scale;
memory.Displacement = displacement;
return result;
}
}
}
}