support real input in fft with mkl (#1120)

* add mkl to handle real input in fft

Author: KsanaKozlova

dpnp/backend/include/dpnp_iface_fft.hpp

@@ -53,33 +53,76 @@
  * Compute the one-dimensional discrete Fourier Transform.
  *
  * @param[in]  q_ref               Reference to SYCL queue.
- * @param[in]  array_in            Input array.
- * @param[out] result              Output array.
+ * @param[in]  array1_in           Input array.
+ * @param[out] result_out          Output array.
  * @param[in]  input_shape         Array with shape information for input array.
- * @param[in]  output_shape        Array with shape information for output array.
- * @param[in]  shape_size          Number of elements in @ref input_shape or @ref output_shape arrays.
+ * @param[in]  result_shape        Array with shape information for result array.
+ * @param[in]  shape_size          Number of elements in @ref input_shape or @ref result_shape arrays.
  * @param[in]  axis                Axis ID to compute by.
  * @param[in]  input_boundarie     Limit number of elements for @ref axis.
  * @param[in]  inverse             Using inverse algorithm.
  * @param[in]  norm                Normalization mode. 0 - backward, 1 - forward, 2 - ortho.
  * @param[in]  dep_event_vec_ref   Reference to vector of SYCL events.
  */
-template <typename _DataType>
+template <typename _DataType_input, typename _DataType_output>
 INP_DLLEXPORT DPCTLSyclEventRef dpnp_fft_fft_c(DPCTLSyclQueueRef q_ref,
-                                               const void* array_in,
-                                               void* result,
+                                               const void* array1_in,
+                                               void* result_out,
                                                const shape_elem_type* input_shape,
-                                               const shape_elem_type* output_shape,
+                                               const shape_elem_type* result_shape,
                                                size_t shape_size,
                                                long axis,
                                                long input_boundarie,
                                                size_t inverse,
                                                const size_t norm,
                                                const DPCTLEventVectorRef dep_event_vec_ref);
 
-template <typename _DataType>
-INP_DLLEXPORT void dpnp_fft_fft_c(const void* array_in,
-                                  void* result,
+template <typename _DataType_input, typename _DataType_output>
+INP_DLLEXPORT void dpnp_fft_fft_c(const void* array1_in,
+                                  void* result_out,
+                                  const shape_elem_type* input_shape,
+                                  const shape_elem_type* output_shape,
+                                  size_t shape_size,
+                                  long axis,
+                                  long input_boundarie,
+                                  size_t inverse,
+                                  const size_t norm);
+
+
+/**
+ * @ingroup BACKEND_FFT_API
+ * @brief 1D discrete Fourier Transform.
+ *
+ * Compute the one-dimensional discrete Fourier Transform for real input.
+ *
+ * @param[in]  q_ref               Reference to SYCL queue.
+ * @param[in]  array1_in           Input array.
+ * @param[out] result_out          Output array.
+ * @param[in]  input_shape         Array with shape information for input array.
+ * @param[in]  result_shape        Array with shape information for result array.
+ * @param[in]  shape_size          Number of elements in @ref input_shape or @ref result_shape arrays.
+ * @param[in]  axis                Axis ID to compute by.
+ * @param[in]  input_boundarie     Limit number of elements for @ref axis.
+ * @param[in]  inverse             Using inverse algorithm.
+ * @param[in]  norm                Normalization mode. 0 - backward, 1 - forward, 2 - ortho.
+ * @param[in]  dep_event_vec_ref   Reference to vector of SYCL events.
+ */
+template <typename _DataType_input, typename _DataType_output>
+INP_DLLEXPORT DPCTLSyclEventRef dpnp_fft_rfft_c(DPCTLSyclQueueRef q_ref,
+                                                const void* array1_in,
+                                                void* result_out,
+                                                const shape_elem_type* input_shape,
+                                                const shape_elem_type* result_shape,
+                                                size_t shape_size,
+                                                long axis,
+                                                long input_boundarie,
+                                                size_t inverse,
+                                                const size_t norm,
+                                                const DPCTLEventVectorRef dep_event_vec_ref);
+
+template <typename _DataType_input, typename _DataType_output>
+INP_DLLEXPORT void dpnp_fft_fft_c(const void* array1_in,
+                                  void* result_out,
                                   const shape_elem_type* input_shape,
                                   const shape_elem_type* output_shape,
                                   size_t shape_size,

dpnp/backend/include/dpnp_iface_fptr.hpp

@@ -166,6 +166,8 @@ enum class DPNPFuncName : size_t
     DPNP_FN_FABS_EXT,                     /**< Used in numpy.fabs() impl, requires extra parameters */
     DPNP_FN_FFT_FFT,                      /**< Used in numpy.fft.fft() impl  */
     DPNP_FN_FFT_FFT_EXT,                  /**< Used in numpy.fft.fft() impl, requires extra parameters */
+    DPNP_FN_FFT_RFFT,                     /**< Used in numpy.fft.rfft() impl  */
+    DPNP_FN_FFT_RFFT_EXT,                 /**< Used in numpy.fft.rfft() impl, requires extra parameters */
     DPNP_FN_FILL_DIAGONAL,                /**< Used in numpy.fill_diagonal() impl  */
     DPNP_FN_FILL_DIAGONAL_EXT,            /**< Used in numpy.fill_diagonal() impl, requires extra parameters */
     DPNP_FN_FLATTEN,                      /**< Used in numpy.flatten() impl  */