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126 lines
3.7 KiB
C#
126 lines
3.7 KiB
C#
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using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.Translation;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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namespace ARMeilleure.CodeGen.Optimizations
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{
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static class Optimizer
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{
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public static void RunPass(ControlFlowGraph cfg)
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{
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bool modified;
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do
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{
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modified = false;
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foreach (BasicBlock block in cfg.Blocks)
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{
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LinkedListNode<Node> node = block.Operations.First;
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while (node != null)
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{
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LinkedListNode<Node> nextNode = node.Next;
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bool isUnused = IsUnused(node.Value);
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if (!(node.Value is Operation operation) || isUnused)
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{
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if (isUnused)
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{
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RemoveNode(block, node);
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modified = true;
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}
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node = nextNode;
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continue;
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}
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ConstantFolding.RunPass(operation);
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Simplification.RunPass(operation);
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if (DestIsLocalVar(operation) && IsPropagableCopy(operation))
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{
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PropagateCopy(operation);
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RemoveNode(block, node);
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modified = true;
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}
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node = nextNode;
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}
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}
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}
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while (modified);
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}
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private static void PropagateCopy(Operation copyOp)
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{
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// Propagate copy source operand to all uses of the destination operand.
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Operand dest = copyOp.Destination;
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Operand source = copyOp.GetSource(0);
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Node[] uses = dest.Uses.ToArray();
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foreach (Node use in uses)
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{
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for (int index = 0; index < use.SourcesCount; index++)
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{
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if (use.GetSource(index) == dest)
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{
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use.SetSource(index, source);
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}
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}
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}
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}
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private static void RemoveNode(BasicBlock block, LinkedListNode<Node> llNode)
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{
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// Remove a node from the nodes list, and also remove itself
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// from all the use lists on the operands that this node uses.
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block.Operations.Remove(llNode);
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Node node = llNode.Value;
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for (int index = 0; index < node.SourcesCount; index++)
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{
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node.SetSource(index, null);
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}
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Debug.Assert(node.Destination == null || node.Destination.Uses.Count == 0);
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node.Destination = null;
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}
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private static bool IsUnused(Node node)
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{
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return DestIsLocalVar(node) && node.Destination.Uses.Count == 0 && !HasSideEffects(node);
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}
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private static bool DestIsLocalVar(Node node)
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{
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return node.Destination != null && node.Destination.Kind == OperandKind.LocalVariable;
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}
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private static bool HasSideEffects(Node node)
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{
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return (node is Operation operation) && operation.Instruction == Instruction.Call;
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}
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private static bool IsPropagableCopy(Operation operation)
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{
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if (operation.Instruction != Instruction.Copy)
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{
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return false;
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}
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return operation.Destination.Type == operation.GetSource(0).Type;
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}
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}
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}
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