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Relax block ordering constraints (#1535)

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* Relax block ordering constraints

Before `block.Next` had to follow `block.ListNext`, now it does not.
Instead `CodeGenerator` will now emit the necessary jump instructions
to ensure control flow.

This makes control flow and block order modifications easier. It also
eliminates some simple cases of redundant branches.

* Set PPTC version
This commit is contained in:
FICTURE7 2020-09-12 19:32:53 +04:00 committed by GitHub
parent 3d055da5fc
commit 36ec1bc6c0
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 164 additions and 174 deletions
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13
ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
View file

@ -427,18 +427,5 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
{
return local.Assignments.Count + local.Uses.Count;
}
private static IEnumerable<BasicBlock> Successors(BasicBlock block)
{
if (block.Next != null)
{
yield return block.Next;
}
if (block.Branch != null)
{
yield return block.Branch;
}
}
}
}

25
ARMeilleure/CodeGen/RegisterAllocators/LinearScanAllocator.cs
View file

@ -626,16 +626,11 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
continue;
}
bool hasSingleOrNoSuccessor = block.Next == null || block.Branch == null;
bool hasSingleOrNoSuccessor = block.SuccessorCount <= 1;
for (int i = 0; i < 2; i++)
for (int i = 0; i < block.SuccessorCount; i++)
{
// This used to use an enumerable, but it ended up generating a lot of garbage, so now it is a loop.
BasicBlock successor = (i == 0) ? block.Next : block.Branch;
if (successor == null)
{
continue;
}
BasicBlock successor = block.GetSuccessor(i);
int succIndex = successor.Index;
@ -643,7 +638,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
// (the successor before the split) should be right after it.
if (IsSplitEdgeBlock(successor))
{
succIndex = FirstSuccessor(successor).Index;
succIndex = successor.GetSuccessor(0).Index;
}
CopyResolver copyResolver = new CopyResolver();
@ -883,10 +878,11 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
BitMap liveOut = blkLiveOut[block.Index];
if ((block.Next != null && liveOut.Set(blkLiveIn[block.Next.Index])) ||
(block.Branch != null && liveOut.Set(blkLiveIn[block.Branch.Index])))
for (int i = 0; i < block.SuccessorCount; i++)
{
modified = true;
BasicBlock succ = block.GetSuccessor(i);
modified |= liveOut.Set(blkLiveIn[succ.Index]);
}
BitMap liveIn = blkLiveIn[block.Index];
@ -1002,11 +998,6 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
return (register.Index << 1) | (register.Type == RegisterType.Vector ? 1 : 0);
}
private static BasicBlock FirstSuccessor(BasicBlock block)
{
return block.Next ?? block.Branch;
}
private static IEnumerable<Node> BottomOperations(BasicBlock block)
{
Node node = block.Operations.Last;

25
ARMeilleure/CodeGen/X86/CodeGenerator.cs
View file

@ -32,7 +32,6 @@ namespace ARMeilleure.CodeGen.X86
Add(Instruction.BitwiseExclusiveOr, GenerateBitwiseExclusiveOr);
Add(Instruction.BitwiseNot, GenerateBitwiseNot);
Add(Instruction.BitwiseOr, GenerateBitwiseOr);
Add(Instruction.Branch, GenerateBranch);
Add(Instruction.BranchIf, GenerateBranchIf);
Add(Instruction.ByteSwap, GenerateByteSwap);
Add(Instruction.Call, GenerateCall);
@ -168,6 +167,23 @@ namespace ARMeilleure.CodeGen.X86
GenerateOperation(context, operation);
}
}
if (block.SuccessorCount == 0)
{
// The only blocks which can have 0 successors are exit blocks.
Debug.Assert(block.Operations.Last is Operation operation &&
(operation.Instruction == Instruction.Tailcall ||
operation.Instruction == Instruction.Return));
}
else
{
BasicBlock succ = block.GetSuccessor(0);
if (succ != block.ListNext)
{
context.JumpTo(succ);
}
}
}
Logger.EndPass(PassName.CodeGeneration);
@ -512,11 +528,6 @@ namespace ARMeilleure.CodeGen.X86
context.Assembler.Or(dest, src2, dest.Type);
}
private static void GenerateBranch(CodeGenContext context, Operation operation)
{
context.JumpTo(context.CurrBlock.Branch);
}
private static void GenerateBranchIf(CodeGenContext context, Operation operation)
{
Operand comp = operation.GetSource(2);
@ -527,7 +538,7 @@ namespace ARMeilleure.CodeGen.X86
GenerateCompareCommon(context, operation);
context.JumpTo(cond, context.CurrBlock.Branch);
context.JumpTo(cond, context.CurrBlock.GetSuccessor(1));
}
private static void GenerateByteSwap(CodeGenContext context, Operation operation)

19
ARMeilleure/Diagnostics/IRDumper.cs
View file

@ -57,17 +57,20 @@ namespace ARMeilleure.Diagnostics
{
DumpBlockName(block);
if (block.Next != null)
if (block.SuccessorCount > 0)
{
_builder.Append(" (next ");
DumpBlockName(block.Next);
_builder.Append(')');
_builder.Append(" (");
for (int i = 0; i < block.SuccessorCount; i++)
{
DumpBlockName(block.GetSuccessor(i));
if (i < block.SuccessorCount - 1)
{
_builder.Append(", ");
}
}
if (block.Branch != null)
{
_builder.Append(" (branch ");
DumpBlockName(block.Branch);
_builder.Append(')');
}

100
ARMeilleure/IntermediateRepresentation/BasicBlock.cs
View file

@ -1,9 +1,12 @@
using System;
using System.Collections.Generic;
namespace ARMeilleure.IntermediateRepresentation
{
class BasicBlock : IIntrusiveListNode<BasicBlock>
{
private readonly List<BasicBlock> _successors = new List<BasicBlock>();
public int Index { get; set; }
public BasicBlock ListPrevious { get; set; }
@ -11,69 +14,82 @@ namespace ARMeilleure.IntermediateRepresentation
public IntrusiveList<Node> Operations { get; }
private BasicBlock _next;
private BasicBlock _branch;
public BasicBlock Next
{
get => _next;
set => _next = AddSuccessor(_next, value);
}
public BasicBlock Branch
{
get => _branch;
set => _branch = AddSuccessor(_branch, value);
}
public List<BasicBlock> Predecessors { get; }
public HashSet<BasicBlock> DominanceFrontiers { get; }
public BasicBlock ImmediateDominator { get; set; }
public BasicBlock()
public int SuccessorCount => _successors.Count;
public BasicBlock() : this(index: -1) { }
public BasicBlock(int index)
{
Operations = new IntrusiveList<Node>();
Predecessors = new List<BasicBlock>();
DominanceFrontiers = new HashSet<BasicBlock>();
Index = -1;
}
public BasicBlock(int index) : this()
{
Index = index;
}
private BasicBlock AddSuccessor(BasicBlock oldBlock, BasicBlock newBlock)
public void AddSuccessor(BasicBlock block)
{
oldBlock?.Predecessors.Remove(this);
newBlock?.Predecessors.Add(this);
if (block == null)
{
throw new ArgumentNullException(nameof(block));
}
return newBlock;
block.Predecessors.Add(this);
_successors.Add(block);
}
public void RemoveSuccessor(int index)
{
BasicBlock oldBlock = _successors[index];
oldBlock.Predecessors.Remove(this);
_successors.RemoveAt(index);
}
public BasicBlock GetSuccessor(int index)
{
return _successors[index];
}
public void SetSuccessor(int index, BasicBlock block)
{
if (block == null)
{
throw new ArgumentNullException(nameof(block));
}
BasicBlock oldBlock = _successors[index];
oldBlock.Predecessors.Remove(this);
block.Predecessors.Add(this);
_successors[index] = block;
}
public void Append(Node node)
{
// If the branch block is not null, then the list of operations
// should end with a branch instruction. We insert the new operation
// before this branch.
if (_branch != null || (Operations.Last != null && IsLeafBlock()))
{
Operations.AddBefore(Operations.Last, node);
}
else
{
Operations.AddLast(node);
}
}
var lastOp = Operations.Last as Operation;
private bool IsLeafBlock()
// Append node before terminal or to end if no terminal.
switch (lastOp?.Instruction)
{
return _branch == null && _next == null;
case Instruction.Return:
case Instruction.Tailcall:
case Instruction.BranchIf:
Operations.AddBefore(lastOp, node);
break;
default:
Operations.AddLast(node);
break;
}
}
public Node GetLastOp()

1
ARMeilleure/IntermediateRepresentation/Instruction.cs
View file

@ -7,7 +7,6 @@ namespace ARMeilleure.IntermediateRepresentation
BitwiseExclusiveOr,
BitwiseNot,
BitwiseOr,
Branch,
BranchIf,
ByteSwap,
Call,

84
ARMeilleure/Translation/ControlFlowGraph.cs
View file

@ -8,11 +8,8 @@ namespace ARMeilleure.Translation
class ControlFlowGraph
{
public BasicBlock Entry { get; }
public IntrusiveList<BasicBlock> Blocks { get; }
public BasicBlock[] PostOrderBlocks { get; }
public int[] PostOrderMap { get; }
public ControlFlowGraph(BasicBlock entry, IntrusiveList<BasicBlock> blocks)
@ -22,33 +19,37 @@ namespace ARMeilleure.Translation
RemoveUnreachableBlocks(blocks);
HashSet<BasicBlock> visited = new HashSet<BasicBlock>();
Stack<BasicBlock> blockStack = new Stack<BasicBlock>();
var visited = new HashSet<BasicBlock>();
var blockStack = new Stack<BasicBlock>();
PostOrderBlocks = new BasicBlock[blocks.Count];
PostOrderMap = new int[blocks.Count];
visited.Add(entry);
blockStack.Push(entry);
int index = 0;
while (blockStack.TryPop(out BasicBlock block))
{
if (block.Next != null && visited.Add(block.Next))
bool visitedNew = false;
for (int i = 0; i < block.SuccessorCount; i++)
{
BasicBlock succ = block.GetSuccessor(i);
if (visited.Add(succ))
{
blockStack.Push(block);
blockStack.Push(block.Next);
blockStack.Push(succ);
visitedNew = true;
break;
}
else if (block.Branch != null && visited.Add(block.Branch))
{
blockStack.Push(block);
blockStack.Push(block.Branch);
}
else
if (!visitedNew)
{
PostOrderMap[block.Index] = index;
@ -59,26 +60,24 @@ namespace ARMeilleure.Translation
private void RemoveUnreachableBlocks(IntrusiveList<BasicBlock> blocks)
{
HashSet<BasicBlock> visited = new HashSet<BasicBlock>();
Queue<BasicBlock> workQueue = new Queue<BasicBlock>();
var visited = new HashSet<BasicBlock>();
var workQueue = new Queue<BasicBlock>();
visited.Add(Entry);
workQueue.Enqueue(Entry);
while (workQueue.TryDequeue(out BasicBlock block))
{
Debug.Assert(block.Index != -1, "Invalid block index.");
if (block.Next != null && visited.Add(block.Next))
for (int i = 0; i < block.SuccessorCount; i++)
{
workQueue.Enqueue(block.Next);
}
BasicBlock succ = block.GetSuccessor(i);
if (block.Branch != null && visited.Add(block.Branch))
if (visited.Add(succ))
{
workQueue.Enqueue(block.Branch);
workQueue.Enqueue(succ);
}
}
}
@ -93,8 +92,10 @@ namespace ARMeilleure.Translation
if (!visited.Contains(block))
{
block.Next = null;
block.Branch = null;
while (block.SuccessorCount > 0)
{
block.RemoveSuccessor(index: block.SuccessorCount - 1);
}
blocks.Remove(block);
}
@ -112,14 +113,12 @@ namespace ARMeilleure.Translation
{
BasicBlock splitBlock = new BasicBlock(Blocks.Count);
if (predecessor.Next == successor)
for (int i = 0; i < predecessor.SuccessorCount; i++)
{
predecessor.Next = splitBlock;
if (predecessor.GetSuccessor(i) == successor)
{
predecessor.SetSuccessor(i, splitBlock);
}
if (predecessor.Branch == successor)
{
predecessor.Branch = splitBlock;
}
if (splitBlock.Predecessors.Count == 0)
@ -127,26 +126,7 @@ namespace ARMeilleure.Translation
throw new ArgumentException("Predecessor and successor are not connected.");
}
// Insert the new block on the list of blocks.
BasicBlock succPrev = successor.ListPrevious;
if (succPrev != null && succPrev != predecessor && succPrev.Next == successor)
{
// Can't insert after the predecessor or before the successor.
// Here, we insert it before the successor by also spliting another
// edge (the one between the block before "successor" and "successor").
BasicBlock splitBlock2 = new BasicBlock(splitBlock.Index + 1);
succPrev.Next = splitBlock2;
splitBlock2.Branch = successor;
splitBlock2.Operations.AddLast(OperationHelper.Operation(Instruction.Branch, null));
Blocks.AddBefore(successor, splitBlock2);
}
splitBlock.Next = successor;
splitBlock.AddSuccessor(successor);
Blocks.AddBefore(successor, splitBlock);

44
ARMeilleure/Translation/EmitterContext.cs
View file

@ -13,18 +13,17 @@ namespace ARMeilleure.Translation
class EmitterContext
{
private Dictionary<Operand, BasicBlock> _irLabels;
private IntrusiveList<BasicBlock> _irBlocks;
private readonly Dictionary<Operand, BasicBlock> _irLabels;
private readonly IntrusiveList<BasicBlock> _irBlocks;
private BasicBlock _irBlock;
private BasicBlock _ifBlock;
private bool _needsNewBlock;
public EmitterContext()
{
_irLabels = new Dictionary<Operand, BasicBlock>();
_irBlocks = new IntrusiveList<BasicBlock>();
_needsNewBlock = true;
@ -57,16 +56,16 @@ namespace ARMeilleure.Translation
public void Branch(Operand label)
{
Add(Instruction.Branch, null);
NewNextBlockIfNeeded();
BranchToLabel(label);
BranchToLabel(label, uncond: true);
}
public void BranchIf(Operand label, Operand op1, Operand op2, Comparison comp)
{
Add(Instruction.BranchIf, null, op1, op2, Const((int)comp));
BranchToLabel(label);
BranchToLabel(label, uncond: false);
}
public void BranchIfFalse(Operand label, Operand op1)
@ -574,10 +573,7 @@ namespace ARMeilleure.Translation
private Operand Add(Intrinsic intrin, Operand dest, params Operand[] sources)
{
if (_needsNewBlock)
{
NewNextBlock();
}
NewNextBlockIfNeeded();
IntrinsicOperation operation = new IntrinsicOperation(intrin, dest, sources);
@ -586,7 +582,7 @@ namespace ARMeilleure.Translation
return dest;
}
private void BranchToLabel(Operand label)
private void BranchToLabel(Operand label, bool uncond)
{
if (!_irLabels.TryGetValue(label, out BasicBlock branchBlock))
{
@ -595,7 +591,15 @@ namespace ARMeilleure.Translation
_irLabels.Add(label, branchBlock);
}
_irBlock.Branch = branchBlock;
if (uncond)
{
_irBlock.AddSuccessor(branchBlock);
}
else
{
// Defer registration of successor to _irBlock so that the order of successors is correct.
_ifBlock = branchBlock;
}
_needsNewBlock = true;
}
@ -629,9 +633,16 @@ namespace ARMeilleure.Translation
private void NextBlock(BasicBlock nextBlock)
{
if (_irBlock != null && !EndsWithUnconditional(_irBlock))
if (_irBlock != null && _irBlock.SuccessorCount == 0 && !EndsWithUnconditional(_irBlock))
{
_irBlock.Next = nextBlock;
_irBlock.AddSuccessor(nextBlock);
if (_ifBlock != null)
{
_irBlock.AddSuccessor(_ifBlock);
_ifBlock = null;
}
}
_irBlock = nextBlock;
@ -642,8 +653,7 @@ namespace ARMeilleure.Translation
private static bool EndsWithUnconditional(BasicBlock block)
{
return block.Operations.Last is Operation lastOp &&
(lastOp.Instruction == Instruction.Branch ||
lastOp.Instruction == Instruction.Return ||
(lastOp.Instruction == Instruction.Return ||
lastOp.Instruction == Instruction.Tailcall);
}

2
ARMeilleure/Translation/PTC/Ptc.cs
View file

@ -21,7 +21,7 @@ namespace ARMeilleure.Translation.PTC
{
private const string HeaderMagic = "PTChd";
private const int InternalVersion = 1537; //! To be incremented manually for each change to the ARMeilleure project.
private const int InternalVersion = 1535; //! To be incremented manually for each change to the ARMeilleure project.
private const string ActualDir = "0";
private const string BackupDir = "1";

9
ARMeilleure/Translation/RegisterUsage.cs
View file

@ -171,14 +171,9 @@ namespace ARMeilleure.Translation
RegisterMask inputs = localInputs[block.Index];
if (block.Next != null)
for (int i = 0; i < block.SuccessorCount; i++)
{
inputs |= globalInputs[block.Next.Index];
}
if (block.Branch != null)
{
inputs |= globalInputs[block.Branch.Index];
inputs |= globalInputs[block.GetSuccessor(i).Index];
}
inputs &= ~globalCmnOutputs[block.Index];

2
ARMeilleure/Translation/Translator.cs
View file

@ -309,8 +309,6 @@ namespace ARMeilleure.Translation
context.Return(Const(0L));
context.Branch(lblExit);
context.MarkLabel(lblNonZero);
count = context.Subtract(count, Const(1));