message: [MLIR][KernelGen] Add E2E test for `tf.Acos`
diff: @@ -24,16 +24,17 @@ include "mlir-hlo/Dialect/mhlo/IR/chlo_ops.td"
  //===----------------------------------------------------------------------===//
  // Expand acos to MHLO dialect as follows:
  -// acos(x) = 2 * atan(sqrt(1 - x^2) / (1 + x)) if x != -1
  +// acos(x) = 2 * atan2(sqrt(1 - x^2), (1 + x)) if x != -1
  // = pi if x == -1
  def : Pat<(HLOClient_AcosOp $input),
  (HLO_SelectOp
  - (HLO_CompareOp $input,
  - (HLO_ConstantLike<"0"> $input),
  + (HLO_CompareOp
  + $input,
  + (HLO_ConstantLike<"-1"> $input),
  HLO_COMPARISON_DIRECTION_NE
  ),
  (HLO_MulOp
  - (HLO_ConstantLike<"2.0f"> $input),
  + (HLO_ConstantLike<"2"> $input),
  (HLO_Atan2Op
  (HLO_SqrtOp
  (HLO_SubOp
  @@ -47,7 +48,8 @@ def : Pat<(HLOClient_AcosOp $input),
  )
  )
  ),
  - (HLO_ConstantLike<"M_PI"> $input))>;
  + (HLO_ConstantLike<"M_PI"> $input)
  + )>;
  // Express `atan` as
  // atan(x) = atan2(x, 1)
  