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Replace LinkedList by IntrusiveList to avoid allocations on JIT (#931)

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* Replace LinkedList by IntrusiveList to avoid allocations on JIT

* Fix wrong replacements
This commit is contained in:
gdkchan 2020-02-17 18:30:54 -03:00 • committed by GitHub
parent e9a37ca6a8
commit e5f78fb1d4
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18 changed files with 365 additions and 198 deletions
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52
ARMeilleure/CodeGen/RegisterAllocators/LinearScanAllocator.cs
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@ -28,7 +28,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
private LiveInterval[] _parentIntervals;
private List<LinkedListNode<Node>> _operationNodes;
private List<(IntrusiveList<Node>, Node)> _operationNodes;
private int _operationsCount;
@ -583,15 +583,19 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
int splitPosition = kv.Key;
LinkedListNode<Node> node = GetOperationNode(splitPosition);
(IntrusiveList<Node> nodes, Node node) = GetOperationNode(splitPosition);
Operation[] sequence = copyResolver.Sequence();
node = node.List.AddBefore(node, sequence[0]);
nodes.AddBefore(node, sequence[0]);
node = sequence[0];
for (int index = 1; index < sequence.Length; index++)
{
node = node.List.AddAfter(node, sequence[index]);
nodes.AddAfter(node, sequence[index]);
node = sequence[index];
}
}
}
@ -605,10 +609,8 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
return block.Index >= blocksCount;
}
for (LinkedListNode<BasicBlock> node = cfg.Blocks.First; node != null; node = node.Next)
for (BasicBlock block = cfg.Blocks.First; block != null; block = block.ListNext)
{
BasicBlock block = node.Value;
if (IsSplitEdgeBlock(block))
{
continue;
@ -666,13 +668,17 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
}
else if (successor.Predecessors.Count == 1)
{
LinkedListNode<Node> prependNode = successor.Operations.AddFirst(sequence[0]);
successor.Operations.AddFirst(sequence[0]);
Node prependNode = sequence[0];
for (int index = 1; index < sequence.Length; index++)
{
Operation operation = sequence[index];
prependNode = successor.Operations.AddAfter(prependNode, operation);
successor.Operations.AddAfter(prependNode, operation);
prependNode = operation;
}
}
else
@ -695,7 +701,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
foreach (int usePosition in current.UsePositions())
{
Node operation = GetOperationNode(usePosition).Value;
(_, Node operation) = GetOperationNode(usePosition);
for (int index = 0; index < operation.SourcesCount; index++)
{
@ -729,14 +735,14 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
interval.Local.Type);
}
private LinkedListNode<Node> GetOperationNode(int position)
private (IntrusiveList<Node>, Node) GetOperationNode(int position)
{
return _operationNodes[position / InstructionGap];
}
private void NumberLocals(ControlFlowGraph cfg)
{
_operationNodes = new List<LinkedListNode<Node>>();
_operationNodes = new List<(IntrusiveList<Node>, Node)>();
_intervals = new List<LiveInterval>();
@ -754,13 +760,11 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
{
BasicBlock block = cfg.PostOrderBlocks[index];
for (LinkedListNode<Node> node = block.Operations.First; node != null; node = node.Next)
for (Node node = block.Operations.First; node != null; node = node.ListNext)
{
_operationNodes.Add(node);
_operationNodes.Add((block.Operations, node));
Node operation = node.Value;
foreach (Operand dest in Destinations(operation))
foreach (Operand dest in Destinations(node))
{
if (dest.Kind == OperandKind.LocalVariable && visited.Add(dest))
{
@ -776,7 +780,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
if (block.Operations.Count == 0)
{
// Pretend we have a dummy instruction on the empty block.
_operationNodes.Add(null);
_operationNodes.Add((null, null));
_operationsCount += InstructionGap;
}
@ -795,12 +799,12 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
BitMap[] blkLiveKill = new BitMap[cfg.Blocks.Count];
// Compute local live sets.
foreach (BasicBlock block in cfg.Blocks)
for (BasicBlock block = cfg.Blocks.First; block != null; block = block.ListNext)
{
BitMap liveGen = new BitMap(mapSize);
BitMap liveKill = new BitMap(mapSize);
foreach (Node node in block.Operations)
for (Node node = block.Operations.First; node != null; node = node.ListNext)
{
foreach (Operand source in Sources(node))
{
@ -979,13 +983,13 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
private static IEnumerable<Node> BottomOperations(BasicBlock block)
{
LinkedListNode<Node> node = block.Operations.Last;
Node node = block.Operations.Last;
while (node != null && !(node.Value is PhiNode))
while (node != null && !(node is PhiNode))
{
yield return node.Value;
yield return node;
node = node.Previous;
node = node.ListPrevious;
}
}