diff --git a/chisel/playground/src/pipeline/execute/ALU.scala b/chisel/playground/src/pipeline/execute/fu/Alu.scala
similarity index 100%
rename from chisel/playground/src/pipeline/execute/ALU.scala
rename to chisel/playground/src/pipeline/execute/fu/Alu.scala
diff --git a/chisel/playground/src/pipeline/execute/BranchCtrl.scala b/chisel/playground/src/pipeline/execute/fu/BranchCtrl.scala
similarity index 100%
rename from chisel/playground/src/pipeline/execute/BranchCtrl.scala
rename to chisel/playground/src/pipeline/execute/fu/BranchCtrl.scala
diff --git a/chisel/playground/src/pipeline/execute/Csr.scala b/chisel/playground/src/pipeline/execute/fu/Csr.scala
similarity index 100%
rename from chisel/playground/src/pipeline/execute/Csr.scala
rename to chisel/playground/src/pipeline/execute/fu/Csr.scala
diff --git a/chisel/playground/src/pipeline/execute/Div.scala b/chisel/playground/src/pipeline/execute/fu/Div.scala
similarity index 100%
rename from chisel/playground/src/pipeline/execute/Div.scala
rename to chisel/playground/src/pipeline/execute/fu/Div.scala
diff --git a/chisel/playground/src/pipeline/execute/Mdu.scala b/chisel/playground/src/pipeline/execute/fu/Mdu.scala
similarity index 100%
rename from chisel/playground/src/pipeline/execute/Mdu.scala
rename to chisel/playground/src/pipeline/execute/fu/Mdu.scala
diff --git a/chisel/playground/src/pipeline/execute/Mul.scala b/chisel/playground/src/pipeline/execute/fu/Mul.scala
similarity index 100%
rename from chisel/playground/src/pipeline/execute/Mul.scala
rename to chisel/playground/src/pipeline/execute/fu/Mul.scala