/* ----------------------------------------------------------------------  
* Copyright (C) 2010 ARM Limited. All rights reserved.  
*  
* $Date:        29. November 2010  
* $Revision: 	V1.0.3  
*  
* Project: 	    CMSIS DSP Library  
* Title:	    arm_mat_trans_q15.c  
*  
* Description:	Q15 matrix transpose.  
*  
* Target Processor: Cortex-M4/Cortex-M3
*  
* Version 1.0.3 2010/11/29 
*    Re-organized the CMSIS folders and updated documentation.  
*   
* Version 1.0.2 2010/11/11  
*    Documentation updated.   
*  
* Version 1.0.1 2010/10/05   
*    Production release and review comments incorporated.  
*  
* Version 1.0.0 2010/09/20   
*    Production release and review comments incorporated.  
*  
* Version 0.0.5  2010/04/26   
*    incorporated review comments and updated with latest CMSIS layer  
*  
* Version 0.0.3  2010/03/10   
*    Initial version  
* -------------------------------------------------------------------- */ 
 
#include "arm_math.h" 
 
/**  
 * @ingroup groupMatrix  
 */ 
 
/**  
 * @addtogroup MatrixTrans  
 * @{  
 */ 
 
/*  
 * @brief Q15 matrix transpose.  
 * @param[in]  *pSrc points to the input matrix  
 * @param[out] *pDst points to the output matrix  
 * @return 	The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>  
 * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.  
 */ 
 
arm_status arm_mat_trans_q15( 
  const arm_matrix_instance_q15 * pSrc, 
  arm_matrix_instance_q15 * pDst) 
{ 
  q15_t *pSrcA = pSrc->pData;                    /* input data matrix pointer */ 
  q15_t *pOut = pDst->pData;                     /* output data matrix pointer */ 
//  q15_t *pDst = pDst->pData;                     /* output data matrix pointer */  
  uint16_t nRows = pSrc->numRows;                /* number of nRows */ 
  uint16_t nColumns = pSrc->numCols;             /* number of nColumns */ 
  uint16_t col, row = nRows, i = 0u;             /* row and column loop counters */ 
  q31_t in;                                      /* variable to hold temporary output  */ 
  arm_status status;                             /* status of matrix transpose */ 
 
 
#ifdef ARM_MATH_MATRIX_CHECK 
  /* Check for matrix mismatch condition */ 
  if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows)) 
  { 
    /* Set status as ARM_MATH_SIZE_MISMATCH */ 
    status = ARM_MATH_SIZE_MISMATCH; 
  } 
  else 
#endif 
  { 
    /* Matrix transpose by exchanging the rows with columns */ 
    /* row loop     */ 
    do 
    { 
      /* Apply loop unrolling and exchange the columns with row elements */ 
      col = nColumns >> 2u; 
 
      /* The pointer pOut is set to starting address of the column being processed */ 
      pOut = pDst->pData + 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) 
      { 
        /* Read two elements from the row */ 
        in = *__SIMD32(pSrcA)++; 
 
        /* Unpack and store one element in the destination */ 
        *pOut = (q15_t) in; 
 
        /* Update the pointer pOut to point to the next row of the transposed matrix */ 
        pOut += nRows; 
 
        /* Unpack and store the second element in the destination */ 
        *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16); 
 
        /* Update the pointer pOut to point to the next row of the transposed matrix */ 
        pOut += nRows; 
 
        /* Read two elements from the row */ 
        in = *__SIMD32(pSrcA)++; 
 
        /* Unpack and store one element in the destination */ 
        *pOut = (q15_t) in; 
 
        /* Update the pointer pOut to point to the next row of the transposed matrix */ 
        pOut += nRows; 
 
        /* Unpack and store the second element in the destination */ 
        *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16); 
 
        /* Update the pointer pOut to point to the next row of the transposed matrix */ 
        pOut += nRows; 
 
        /* Decrement the column loop counter */ 
        col--; 
      } 
 
      /* Perform matrix transpose for last 3 samples here. */ 
      col = nColumns % 0x4u; 
 
      while(col > 0u) 
      { 
        /* Read and store the input element in the destination */ 
        *pOut = *pSrcA++; 
 
        /* Update the pointer pOut to point to the next row of the transposed matrix */ 
        pOut += nRows; 
 
        /* Decrement the column loop counter */ 
        col--; 
      } 
 
      i++; 
 
      /* 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 MatrixTrans group  
 */