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Reduce JIT GC allocations (#2515)

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* Turn `MemoryOperand` into a struct

* Remove `IntrinsicOperation`

* Remove `PhiNode`

* Remove `Node`

* Turn `Operand` into a struct

* Turn `Operation` into a struct

* Clean up pool management methods

* Add `Arena` allocator

* Move `OperationHelper` to `Operation.Factory`

* Move `OperandHelper` to `Operand.Factory`

* Optimize `Operation` a bit

* Fix `Arena` initialization

* Rename `NativeList<T>` to `ArenaList<T>`

* Reduce `Operand` size from 88 to 56 bytes

* Reduce `Operation` size from 56 to 40 bytes

* Add optimistic interning of Register & Constant operands

* Optimize `RegisterUsage` pass a bit

* Optimize `RemoveUnusedNodes` pass a bit

Iterating in reverse-order allows killing dependency chains in a single
pass.

* Fix PPTC symbols

* Optimize `BasicBlock` a bit

Reduce allocations from `_successor` & `DominanceFrontiers`

* Fix `Operation` resize

* Make `Arena` expandable

Change the arena allocator to be expandable by allocating in pages, with
some of them being pooled. Currently 32 pages are pooled. An LRU removal
mechanism should probably be added to it.

Apparently MHR can allocate bitmaps large enough to exceed the 16MB
limit for the type.

* Move `Arena` & `ArenaList` to `Common`

* Remove `ThreadStaticPool` & co

* Add `PhiOperation`

* Reduce `Operand` size from 56 from 48 bytes

* Add linear-probing to `Operand` intern table

* Optimize `HybridAllocator` a bit

* Add `Allocators` class

* Tune `ArenaAllocator` sizes

* Add page removal mechanism to `ArenaAllocator`

Remove pages which have not been used for more than 5s after each reset.

I am on fence if this would be better using a Gen2 callback object like
the one in System.Buffers.ArrayPool<T>, to trim the pool. Because right
now if a large translation happens, the pages will be freed only after a
reset. This reset may not happen for a while because no new translation
is hit, but the arena base sizes are rather small.

* Fix `OOM` when allocating larger than page size in `ArenaAllocator`

Tweak resizing mechanism for Operand.Uses and Assignemnts.

* Optimize `Optimizer` a bit

* Optimize `Operand.Add<T>/Remove<T>` a bit

* Clean up `PreAllocator`

* Fix phi insertion order

Reduce codegen diffs.

* Fix code alignment

* Use new heuristics for degree of parallelism

* Suppress warnings

* Address gdkchan's feedback

Renamed `GetValue()` to `GetValueUnsafe()` to make it more clear that
`Operand.Value` should usually not be modified directly.

* Add fast path to `ArenaAllocator`

* Assembly for `ArenaAllocator.Allocate(ulong)`:

  .L0:
    mov rax, [rcx+0x18]
    lea r8, [rax+rdx]
    cmp r8, [rcx+0x10]
    ja short .L2
  .L1:
    mov rdx, [rcx+8]
    add rax, [rdx+8]
    mov [rcx+0x18], r8
    ret
  .L2:
    jmp ArenaAllocator.AllocateSlow(UInt64)

  A few variable/field had to be changed to ulong so that RyuJIT avoids
  emitting zero-extends.

* Implement a new heuristic to free pooled pages.

  If an arena is used often, it is more likely that its pages will be
  needed, so the pages are kept for longer (e.g: during PPTC rebuild or
  burst sof compilations). If is not used often, then it is more likely
  that its pages will not be needed (e.g: after PPTC rebuild or bursts
  of compilations).

* Address riperiperi's feedback

* Use `EqualityComparer<T>` in `IntrusiveList<T>`

Avoids a potential GC hole in `Equals(T, T)`.
This commit is contained in:
FICTURE7
2021-08-17 22:08:34 +04:00
committed by GitHub
parent cd4530f29c
commit 22b2cb39af
91 changed files with 2354 additions and 2142 deletions
Download Patch File Download Diff File Expand all files Collapse all files

246
ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
View File

@ -1,11 +1,10 @@
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Translation;
using System.Collections.Generic;
using System;
using System.Diagnostics;
using System.Numerics;
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
using static ARMeilleure.IntermediateRepresentation.OperationHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
using static ARMeilleure.IntermediateRepresentation.Operation.Factory;
namespace ARMeilleure.CodeGen.RegisterAllocators
{
@ -29,19 +28,14 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
}
}
private class LocalInfo
private struct LocalInfo
{
public int Uses { get; set; }
public int UseCount { get; set; }
public bool PreAllocated { get; set; }
public int Register { get; set; }
public int SpillOffset { get; set; }
public int Uses { get; set; }
public int UsesAllocated { get; set; }
public int Register { get; set; }
public int SpillOffset { get; set; }
public int Sequence { get; set; }
public Operand Temp { get; set; }
public OperandType Type { get; }
private int _first;
@ -49,13 +43,21 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
public bool IsBlockLocal => _first == _last;
public LocalInfo(OperandType type, int uses)
public LocalInfo(OperandType type, int uses, int blkIndex)
{
Uses = uses;
Type = type;
UsesAllocated = 0;
Register = 0;
SpillOffset = 0;
Sequence = 0;
Temp = default;
_first = -1;
_last = -1;
SetBlockIndex(blkIndex);
}
public void SetBlockIndex(int blkIndex)
@ -72,10 +74,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
}
}
public AllocationResult RunPass(
ControlFlowGraph cfg,
StackAllocator stackAlloc,
RegisterMasks regMasks)
public AllocationResult RunPass(ControlFlowGraph cfg, StackAllocator stackAlloc, RegisterMasks regMasks)
{
int intUsedRegisters = 0;
int vecUsedRegisters = 0;
@ -84,9 +83,33 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
int vecFreeRegisters = regMasks.VecAvailableRegisters;
var blockInfo = new BlockInfo[cfg.Blocks.Count];
var localInfo = new LocalInfo[cfg.Blocks.Count * 3];
int localInfoCount = 0;
var locInfo = new List<LocalInfo>();
var locVisited = new HashSet<Operand>();
// The "visited" state is stored in the MSB of the local's value.
const ulong VisitedMask = 1ul << 63;
bool IsVisited(Operand local)
{
return (local.GetValueUnsafe() & VisitedMask) != 0;
}
void SetVisited(Operand local)
{
local.GetValueUnsafe() |= VisitedMask | (uint)++localInfoCount;
}
ref LocalInfo GetLocalInfo(Operand local)
{
Debug.Assert(local.Kind == OperandKind.LocalVariable);
if (!IsVisited(local))
{
throw new InvalidOperationException("Local was not visisted yet. Used before defined?");
}
return ref localInfo[(uint)local.GetValueUnsafe() - 1];
}
for (int index = cfg.PostOrderBlocks.Length - 1; index >= 0; index--)
{
@ -97,59 +120,58 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
bool hasCall = false;
for (Node node = block.Operations.First; node != null; node = node.ListNext)
for (Operation node = block.Operations.First; node != default; node = node.ListNext)
{
if (node is Operation operation && operation.Instruction == Instruction.Call)
if (node.Instruction == Instruction.Call)
{
hasCall = true;
}
for (int srcIndex = 0; srcIndex < node.SourcesCount; srcIndex++)
for (int i = 0; i < node.SourcesCount; i++)
{
Operand source = node.GetSource(srcIndex);
Operand source = node.GetSource(i);
if (source.Kind == OperandKind.LocalVariable)
{
locInfo[source.GetLocalNumber() - 1].SetBlockIndex(block.Index);
GetLocalInfo(source).SetBlockIndex(block.Index);
}
else if (source.Kind == OperandKind.Memory)
{
MemoryOperand memOp = (MemoryOperand)source;
MemoryOperand memOp = source.GetMemory();
if (memOp.BaseAddress != null)
if (memOp.BaseAddress != default)
{
locInfo[memOp.BaseAddress.GetLocalNumber() - 1].SetBlockIndex(block.Index);
GetLocalInfo(memOp.BaseAddress).SetBlockIndex(block.Index);
}
if (memOp.Index != null)
if (memOp.Index != default)
{
locInfo[memOp.Index.GetLocalNumber() - 1].SetBlockIndex(block.Index);
GetLocalInfo(memOp.Index).SetBlockIndex(block.Index);
}
}
}
for (int dstIndex = 0; dstIndex < node.DestinationsCount; dstIndex++)
for (int i = 0; i < node.DestinationsCount; i++)
{
Operand dest = node.GetDestination(dstIndex);
Operand dest = node.GetDestination(i);
if (dest.Kind == OperandKind.LocalVariable)
{
LocalInfo info;
if (!locVisited.Add(dest))
if (IsVisited(dest))
{
info = locInfo[dest.GetLocalNumber() - 1];
GetLocalInfo(dest).SetBlockIndex(block.Index);
}
else
{
dest.NumberLocal(locInfo.Count + 1);
SetVisited(dest);
info = new LocalInfo(dest.Type, UsesCount(dest));
if (localInfoCount > localInfo.Length)
{
Array.Resize(ref localInfo, localInfoCount * 2);
}
locInfo.Add(info);
GetLocalInfo(dest) = new LocalInfo(dest.Type, UsesCount(dest), block.Index);
}
info.SetBlockIndex(block.Index);
}
else if (dest.Kind == OperandKind.Register)
{
@ -192,42 +214,26 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
intLocalFreeRegisters &= ~(intSpillTempRegisters | intCallerSavedRegisters);
vecLocalFreeRegisters &= ~(vecSpillTempRegisters | vecCallerSavedRegisters);
for (Node node = block.Operations.First; node != null; node = node.ListNext)
for (Operation node = block.Operations.First; node != default; node = node.ListNext)
{
int intLocalUse = 0;
int vecLocalUse = 0;
void AllocateRegister(Operand source, MemoryOperand memOp, int srcIndex)
Operand AllocateRegister(Operand local)
{
LocalInfo info = locInfo[source.GetLocalNumber() - 1];
ref LocalInfo info = ref GetLocalInfo(local);
info.UseCount++;
info.UsesAllocated++;
Debug.Assert(info.UseCount <= info.Uses);
Debug.Assert(info.UsesAllocated <= info.Uses);
if (info.Register != -1)
{
Operand reg = Register(info.Register, source.Type.ToRegisterType(), source.Type);
Operand reg = Register(info.Register, local.Type.ToRegisterType(), local.Type);
if (memOp != null)
if (info.UsesAllocated == info.Uses)
{
if (srcIndex == 0)
{
memOp.BaseAddress = reg;
}
else /* if (srcIndex == 1) */
{
memOp.Index = reg;
}
}
else
{
node.SetSource(srcIndex, reg);
}
if (info.UseCount == info.Uses && !info.PreAllocated)
{
if (source.Type.IsInteger())
if (local.Type.IsInteger())
{
intLocalFreeRegisters |= 1 << info.Register;
}
@ -236,72 +242,80 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
vecLocalFreeRegisters |= 1 << info.Register;
}
}
}
else if (node is Operation operation && operation.Instruction == Instruction.Copy)
{
Operation fillOp = Operation(Instruction.Fill, node.Destination, Const(info.SpillOffset));
block.Operations.AddBefore(node, fillOp);
block.Operations.Remove(node);
node = fillOp;
return reg;
}
else
{
Operand temp = info.Temp;
if (temp == null || info.Sequence != sequence)
if (temp == default || info.Sequence != sequence)
{
temp = source.Type.IsInteger()
? GetSpillTemp(source, intSpillTempRegisters, ref intLocalUse)
: GetSpillTemp(source, vecSpillTempRegisters, ref vecLocalUse);
temp = local.Type.IsInteger()
? GetSpillTemp(local, intSpillTempRegisters, ref intLocalUse)
: GetSpillTemp(local, vecSpillTempRegisters, ref vecLocalUse);
info.Sequence = sequence;
info.Temp = temp;
}
if (memOp != null)
{
if (srcIndex == 0)
{
memOp.BaseAddress = temp;
}
else /* if (srcIndex == 1) */
{
memOp.Index = temp;
}
}
else
{
node.SetSource(srcIndex, temp);
}
Operation fillOp = Operation(Instruction.Fill, temp, Const(info.SpillOffset));
block.Operations.AddBefore(node, fillOp);
return temp;
}
}
for (int srcIndex = 0; srcIndex < node.SourcesCount; srcIndex++)
bool folded = false;
// If operation is a copy of a local and that local is living on the stack, we turn the copy into
// a fill, instead of inserting a fill before it.
if (node.Instruction == Instruction.Copy)
{
Operand source = node.GetSource(srcIndex);
Operand source = node.GetSource(0);
if (source.Kind == OperandKind.LocalVariable)
{
AllocateRegister(source, null, srcIndex);
}
else if (source.Kind == OperandKind.Memory)
{
MemoryOperand memOp = (MemoryOperand)source;
ref LocalInfo info = ref GetLocalInfo(source);
if (memOp.BaseAddress != null)
if (info.Register == -1)
{
AllocateRegister(memOp.BaseAddress, memOp, 0);
Operation fillOp = Operation(Instruction.Fill, node.Destination, Const(info.SpillOffset));
block.Operations.AddBefore(node, fillOp);
block.Operations.Remove(node);
node = fillOp;
folded = true;
}
}
}
if (memOp.Index != null)
if (!folded)
{
for (int i = 0; i < node.SourcesCount; i++)
{
Operand source = node.GetSource(i);
if (source.Kind == OperandKind.LocalVariable)
{
AllocateRegister(memOp.Index, memOp, 1);
node.SetSource(i, AllocateRegister(source));
}
else if (source.Kind == OperandKind.Memory)
{
MemoryOperand memOp = source.GetMemory();
if (memOp.BaseAddress != default)
{
memOp.BaseAddress = AllocateRegister(memOp.BaseAddress);
}
if (memOp.Index != default)
{
memOp.Index = AllocateRegister(memOp.Index);
}
}
}
}
@ -309,18 +323,18 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
int intLocalAsg = 0;
int vecLocalAsg = 0;
for (int dstIndex = 0; dstIndex < node.DestinationsCount; dstIndex++)
for (int i = 0; i < node.DestinationsCount; i++)
{
Operand dest = node.GetDestination(dstIndex);
Operand dest = node.GetDestination(i);
if (dest.Kind != OperandKind.LocalVariable)
{
continue;
}
LocalInfo info = locInfo[dest.GetLocalNumber() - 1];
ref LocalInfo info = ref GetLocalInfo(dest);
if (info.UseCount == 0 && !info.PreAllocated)
if (info.UsesAllocated == 0)
{
int mask = dest.Type.IsInteger()
? intLocalFreeRegisters
@ -350,19 +364,19 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
}
}
info.UseCount++;
info.UsesAllocated++;
Debug.Assert(info.UseCount <= info.Uses);
Debug.Assert(info.UsesAllocated <= info.Uses);
if (info.Register != -1)
{
node.SetDestination(dstIndex, Register(info.Register, dest.Type.ToRegisterType(), dest.Type));
node.SetDestination(i, Register(info.Register, dest.Type.ToRegisterType(), dest.Type));
}
else
{
Operand temp = info.Temp;
if (temp == null || info.Sequence != sequence)
if (temp == default || info.Sequence != sequence)
{
temp = dest.Type.IsInteger()
? GetSpillTemp(dest, intSpillTempRegisters, ref intLocalAsg)
@ -372,9 +386,9 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
info.Temp = temp;
}
node.SetDestination(dstIndex, temp);
node.SetDestination(i, temp);
Operation spillOp = Operation(Instruction.Spill, null, Const(info.SpillOffset), temp);
Operation spillOp = Operation(Instruction.Spill, default, Const(info.SpillOffset), temp);
block.Operations.AddAfter(node, spillOp);
@ -435,7 +449,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
private static int UsesCount(Operand local)
{
return local.Assignments.Count + local.Uses.Count;
return local.AssignmentsCount + local.UsesCount;
}
}
}