1 files changed, 0 insertions, 83 deletions
diff --git a/ARMeilleure/CodeGen/Optimizations/TailMerge.cs b/ARMeilleure/CodeGen/Optimizations/TailMerge.cs
deleted file mode 100644
index e94df159..00000000
--- a/ARMeilleure/CodeGen/Optimizations/TailMerge.cs
+++ /dev/null
@@ -1,83 +0,0 @@
-using ARMeilleure.IntermediateRepresentation;
-using ARMeilleure.Translation;
-using static ARMeilleure.IntermediateRepresentation.Operation.Factory;
-
-namespace ARMeilleure.CodeGen.Optimizations
-{
-    static class TailMerge
-    {
-        public static void RunPass(in CompilerContext cctx)
-        {
-            ControlFlowGraph cfg = cctx.Cfg;
-
-            BasicBlock mergedReturn = new(cfg.Blocks.Count);
-
-            Operand returnValue;
-            Operation returnOp;
-
-            if (cctx.FuncReturnType == OperandType.None)
-            {
-                returnValue = default;
-                returnOp = Operation(Instruction.Return, default);
-            }
-            else
-            {
-                returnValue = cfg.AllocateLocal(cctx.FuncReturnType);
-                returnOp = Operation(Instruction.Return, default, returnValue);
-            }
-
-            mergedReturn.Frequency = BasicBlockFrequency.Cold;
-            mergedReturn.Operations.AddLast(returnOp);
-
-            for (BasicBlock block = cfg.Blocks.First; block != null; block = block.ListNext)
-            {
-                Operation op = block.Operations.Last;
-
-                if (op != default && op.Instruction == Instruction.Return)
-                {
-                    block.Operations.Remove(op);
-
-                    if (cctx.FuncReturnType == OperandType.None)
-                    {
-                        PrepareMerge(block, mergedReturn);
-                    }
-                    else
-                    {
-                        Operation copyOp = Operation(Instruction.Copy, returnValue, op.GetSource(0));
-
-                        PrepareMerge(block, mergedReturn).Append(copyOp);
-                    }
-                }
-            }
-
-            cfg.Blocks.AddLast(mergedReturn);
-            cfg.Update();
-        }
-
-        private static BasicBlock PrepareMerge(BasicBlock from, BasicBlock to)
-        {
-            BasicBlock fromPred = from.Predecessors.Count == 1 ? from.Predecessors[0] : null;
-
-            // If the block is empty, we can try to append to the predecessor and avoid unnecessary jumps.
-            if (from.Operations.Count == 0 && fromPred != null && fromPred.SuccessorsCount == 1)
-            {
-                for (int i = 0; i < fromPred.SuccessorsCount; i++)
-                {
-                    if (fromPred.GetSuccessor(i) == from)
-                    {
-                        fromPred.SetSuccessor(i, to);
-                    }
-                }
-
-                // NOTE: `from` becomes unreachable and the call to `cfg.Update()` will remove it.
-                return fromPred;
-            }
-            else
-            {
-                from.AddSuccessor(to);
-
-                return from;
-            }
-        }
-    }
-}