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/* ----------------------------------------------------------------------

 * Project:      CMSIS DSP Library

 * Title:        arm_cmplx_mat_mult_q15.c

 * Description:  Q15 complex matrix multiplication

 *

 * $Date:        27. January 2017

 * $Revision:    V.1.5.1

 *

 * Target Processor: Cortex-M cores

 * -------------------------------------------------------------------- */

/*

 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.

 *

 * SPDX-License-Identifier: Apache-2.0

 *

 * Licensed under the Apache License, Version 2.0 (the License); you may

 * not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 * www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an AS IS BASIS, WITHOUT

 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include "arm_math.h"

/**

 * @ingroup groupMatrix

 */

/**

 * @addtogroup CmplxMatrixMult

 * @{

 */

/**

 * @brief Q15 Complex matrix multiplication

 * @param[in]       *pSrcA points to the first input complex matrix structure

 * @param[in]       *pSrcB points to the second input complex matrix structure

 * @param[out]      *pDst points to output complex matrix structure

 * @param[in]           *pScratch points to the array for storing intermediate results

 * @return              The function returns either

 * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.

 *

 * \par Conditions for optimum performance

 *  Input, output and state buffers should be aligned by 32-bit

 *

 * \par Restrictions

 *  If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE

 *      In this case input, output, scratch buffers should be aligned by 32-bit

 *

 * @details

 * <b>Scaling and Overflow Behavior:</b>

 *

 * \par

 * The function is implemented using a 64-bit internal accumulator. The inputs to the

 * multiplications are in 1.15 format and multiplications yield a 2.30 result.

 * The 2.30 intermediate

 * results are accumulated in a 64-bit accumulator in 34.30 format. This approach

 * provides 33 guard bits and there is no risk of overflow. The 34.30 result is then

 * truncated to 34.15 format by discarding the low 15 bits and then saturated to

 * 1.15 format.

 *

 * \par

 * Refer to <code>arm_mat_mult_fast_q15()</code> for a faster but less precise version of this function.

 *

 */

arm_status arm_mat_cmplx_mult_q15(

  const arm_matrix_instance_q15 * pSrcA,

  const arm_matrix_instance_q15 * pSrcB,

  arm_matrix_instance_q15 * pDst,

  q15_t * pScratch)

{

  /* accumulator */

  q15_t *pSrcBT = pScratch;                      /* input data matrix pointer for transpose */

  q15_t *pInA = pSrcA->pData;                    /* input data matrix pointer A of Q15 type */

  q15_t *pInB = pSrcB->pData;                    /* input data matrix pointer B of Q15 type */

  q15_t *px;                                     /* Temporary output data matrix pointer */

  uint16_t numRowsA = pSrcA->numRows;            /* number of rows of input matrix A    */

  uint16_t numColsB = pSrcB->numCols;            /* number of columns of input matrix B */

  uint16_t numColsA = pSrcA->numCols;            /* number of columns of input matrix A */

  uint16_t numRowsB = pSrcB->numRows;            /* number of rows of input matrix A    */

  uint16_t col, i = 0U, row = numRowsB, colCnt;  /* loop counters */

  arm_status status;                             /* status of matrix multiplication */

  q63_t sumReal, sumImag;

#ifdef UNALIGNED_SUPPORT_DISABLE

  q15_t in;                                      /* Temporary variable to hold the input value */

  q15_t a, b, c, d;

#else

  q31_t in;                                      /* Temporary variable to hold the input value */

  q31_t prod1, prod2;

  q31_t pSourceA, pSourceB;

#endif

#ifdef ARM_MATH_MATRIX_CHECK

  /* Check for matrix mismatch condition */

  if ((pSrcA->numCols != pSrcB->numRows) ||

     (pSrcA->numRows != pDst->numRows) || (pSrcB->numCols != pDst->numCols))

  {

    /* Set status as ARM_MATH_SIZE_MISMATCH */

    status = ARM_MATH_SIZE_MISMATCH;

  }

  else

#endif

  {

    /* Matrix transpose */

    do

    {

      /* Apply loop unrolling and exchange the columns with row elements */

      col = numColsB >> 2;

      /* The pointer px is set to starting address of the column being processed */

      px = pSrcBT + i;

      /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.

       ** a second loop below computes the remaining 1 to 3 samples. */

      while (col > 0U)

      {

#ifdef UNALIGNED_SUPPORT_DISABLE

        /* Read two elements from the row */

        in = *pInB++;

        *px = in;

        in = *pInB++;

        px[1] = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Read two elements from the row */

        in = *pInB++;

        *px = in;

        in = *pInB++;

        px[1] = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Read two elements from the row */

        in = *pInB++;

        *px = in;

        in = *pInB++;

        px[1] = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Read two elements from the row */

        in = *pInB++;

        *px = in;

        in = *pInB++;

        px[1] = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Decrement the column loop counter */

        col--;

      }

      /* If the columns of pSrcB is not a multiple of 4, compute any remaining output samples here.

       ** No loop unrolling is used. */

      col = numColsB % 0x4U;

      while (col > 0U)

      {

        /* Read two elements from the row */

        in = *pInB++;

        *px = in;

        in = *pInB++;

        px[1] = in;

#else

        /* Read two elements from the row */

        in = *__SIMD32(pInB)++;

        *__SIMD32(px) = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Read two elements from the row */

        in = *__SIMD32(pInB)++;

        *__SIMD32(px) = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Read two elements from the row */

        in = *__SIMD32(pInB)++;

        *__SIMD32(px) = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Read two elements from the row */

        in = *__SIMD32(pInB)++;

        *__SIMD32(px) = in;

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Decrement the column loop counter */

        col--;

      }

      /* If the columns of pSrcB is not a multiple of 4, compute any remaining output samples here.

       ** No loop unrolling is used. */

      col = numColsB % 0x4U;

      while (col > 0U)

      {

        /* Read two elements from the row */

        in = *__SIMD32(pInB)++;

        *__SIMD32(px) = in;

#endif

        /* Update the pointer px to point to the next row of the transposed matrix */

        px += numRowsB * 2;

        /* Decrement the column loop counter */

        col--;

      }

      i = i + 2U;

      /* Decrement the row loop counter */

      row--;

    } while (row > 0U);

    /* Reset the variables for the usage in the following multiplication process */

    row = numRowsA;

    i = 0U;

    px = pDst->pData;

    /* The following loop performs the dot-product of each row in pSrcA with each column in pSrcB */

    /* row loop */

    do

    {

      /* For every row wise process, the column loop counter is to be initiated */

      col = numColsB;

      /* For every row wise process, the pIn2 pointer is set

       ** to the starting address of the transposed pSrcB data */

      pInB = pSrcBT;

      /* column loop */

      do

      {

        /* Set the variable sum, that acts as accumulator, to zero */

        sumReal = 0;

        sumImag = 0;

        /* Apply loop unrolling and compute 2 MACs simultaneously. */

        colCnt = numColsA >> 1;

        /* Initiate the pointer pIn1 to point to the starting address of the column being processed */

        pInA = pSrcA->pData + i * 2;

        /* matrix multiplication */

        while (colCnt > 0U)

        {

          /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */

#ifdef UNALIGNED_SUPPORT_DISABLE

          /* read real and imag values from pSrcA buffer */

          a = *pInA;

          b = *(pInA + 1U);

          /* read real and imag values from pSrcB buffer */

          c = *pInB;

          d = *(pInB + 1U);

          /* Multiply and Accumlates */

          sumReal += (q31_t) a *c;

          sumImag += (q31_t) a *d;

          sumReal -= (q31_t) b *d;

          sumImag += (q31_t) b *c;

          /* read next real and imag values from pSrcA buffer */

          a = *(pInA + 2U);

          b = *(pInA + 3U);

          /* read next real and imag values from pSrcB buffer */

          c = *(pInB + 2U);

          d = *(pInB + 3U);

          /* update pointer */

          pInA += 4U;

          /* Multiply and Accumlates */

          sumReal += (q31_t) a *c;

          sumImag += (q31_t) a *d;

          sumReal -= (q31_t) b *d;

          sumImag += (q31_t) b *c;

          /* update pointer */

          pInB += 4U;

#else

          /* read real and imag values from pSrcA and pSrcB buffer */

          pSourceA = *__SIMD32(pInA)++;

          pSourceB = *__SIMD32(pInB)++;

          /* Multiply and Accumlates */

#ifdef ARM_MATH_BIG_ENDIAN

          prod1 = -__SMUSD(pSourceA, pSourceB);

#else

          prod1 = __SMUSD(pSourceA, pSourceB);

#endif

          prod2 = __SMUADX(pSourceA, pSourceB);

          sumReal += (q63_t) prod1;

          sumImag += (q63_t) prod2;

          /* read real and imag values from pSrcA and pSrcB buffer */

          pSourceA = *__SIMD32(pInA)++;

          pSourceB = *__SIMD32(pInB)++;

          /* Multiply and Accumlates */

#ifdef ARM_MATH_BIG_ENDIAN

          prod1 = -__SMUSD(pSourceA, pSourceB);

#else

          prod1 = __SMUSD(pSourceA, pSourceB);

#endif

          prod2 = __SMUADX(pSourceA, pSourceB);

          sumReal += (q63_t) prod1;

          sumImag += (q63_t) prod2;

#endif /*      #ifdef UNALIGNED_SUPPORT_DISABLE */

          /* Decrement the loop counter */

          colCnt--;

        }

        /* process odd column samples */

        if ((numColsA & 0x1U) > 0U)

        {

          /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */

#ifdef UNALIGNED_SUPPORT_DISABLE

          /* read real and imag values from pSrcA and pSrcB buffer */

          a = *pInA++;

          b = *pInA++;

          c = *pInB++;

          d = *pInB++;

          /* Multiply and Accumlates */

          sumReal += (q31_t) a *c;

          sumImag += (q31_t) a *d;

          sumReal -= (q31_t) b *d;

          sumImag += (q31_t) b *c;

#else

          /* read real and imag values from pSrcA and pSrcB buffer */

          pSourceA = *__SIMD32(pInA)++;

          pSourceB = *__SIMD32(pInB)++;

          /* Multiply and Accumlates */

#ifdef ARM_MATH_BIG_ENDIAN

          prod1 = -__SMUSD(pSourceA, pSourceB);

#else

          prod1 = __SMUSD(pSourceA, pSourceB);

#endif

          prod2 = __SMUADX(pSourceA, pSourceB);

          sumReal += (q63_t) prod1;

          sumImag += (q63_t) prod2;

#endif /*      #ifdef UNALIGNED_SUPPORT_DISABLE */

        }

        /* Saturate and store the result in the destination buffer */

        *px++ = (q15_t) (__SSAT(sumReal >> 15, 16));

        *px++ = (q15_t) (__SSAT(sumImag >> 15, 16));

        /* Decrement the column loop counter */

        col--;

      } while (col > 0U);

      i = i + numColsA;

      /* Decrement the row loop counter */

      row--;

    } while (row > 0U);

    /* set status as ARM_MATH_SUCCESS */

    status = ARM_MATH_SUCCESS;

  }

  /* Return to application */

  return (status);

}

/**

 * @} end of MatrixMult group

 */