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46 lines
1.3 KiB
C#
46 lines
1.3 KiB
C#
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using ARMeilleure.IntermediateRepresentation;
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using System.Collections.Generic;
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using static ARMeilleure.IntermediateRepresentation.OperandHelper;
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namespace ARMeilleure.Translation
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{
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static partial class Ssa
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{
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public static void Deconstruct(ControlFlowGraph cfg)
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{
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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?.Value is PhiNode phi)
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{
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LinkedListNode<Node> nextNode = node.Next;
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Operand local = Local(phi.Destination.Type);
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for (int index = 0; index < phi.SourcesCount; index++)
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{
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BasicBlock predecessor = phi.GetBlock(index);
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Operand source = phi.GetSource(index);
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predecessor.Append(new Operation(Instruction.Copy, local, source));
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phi.SetSource(index, null);
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}
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Operation copyOp = new Operation(Instruction.Copy, phi.Destination, local);
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block.Operations.AddBefore(node, copyOp);
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phi.Destination = null;
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block.Operations.Remove(node);
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node = nextNode;
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}
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}
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}
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}
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}
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