text: /* ----------------------------------------------------------------------------    
  * Copyright (C) 2010 ARM Limited. All rights reserved.    
  *    
  * $Date:        15. February 2012  
  * $Revision: 	V1.1.0  
  *    
  * Project: 	    CMSIS DSP Library    
  * Title:		arm_q7_to_q31.c    
  *    
  * Description:	Converts the elements of the Q7 vector to Q31 vector.  
  *    
  * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
  *  
  * Version 1.1.0 2012/02/15 
  *    Updated with more optimizations, bug fixes and minor API changes.  
  *   
  * Version 1.0.10 2011/7/15  
  *    Big Endian support added and Merged M0 and M3/M4 Source code.   
  *    
  * 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.    
  * ---------------------------------------------------------------------------- */
  
  #include "arm_math.h"
  
  /**    
   * @ingroup groupSupport    
   */
  
  /**    
   * @addtogroup q7_to_x    
   * @{    
   */
  
  /**    
   * @brief Converts the elements of the Q7 vector to Q31 vector.    
   * @param[in]       *pSrc points to the Q7 input vector    
   * @param[out]      *pDst points to the Q31 output vector   
   * @param[in]       blockSize length of the input vector    
   * @return none.    
   *    
   * \par Description:    
   *    
   * The equation used for the conversion process is:    
   *   
   * <pre>    
   * 	pDst[n] = (q31_t) pSrc[n] << 24;   0 <= n < blockSize.   
   * </pre>     
   *   
   */
  
  
  void arm_q7_to_q31(
    q7_t * pSrc,
    q31_t * pDst,
    uint32_t blockSize)
  {
    q7_t *pIn = pSrc;                              /* Src pointer */
    uint32_t blkCnt;                               /* loop counter */
  
  #ifndef ARM_MATH_CM0
  
    q31_t in;
  
    /* Run the below code for Cortex-M4 and Cortex-M3 */
  
    /*loop Unrolling */
    blkCnt = blockSize >> 2u;
  
    /* 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(blkCnt > 0u)
    {
      /* C = (q31_t) A << 24 */
      /* convert from q7 to q31 and then store the results in the destination buffer */
      in = *__SIMD32(pIn)++;
  
  #ifndef ARM_MATH_BIG_ENDIAN
  
      *pDst++ = (__ROR(in, 8)) & 0xFF000000;
      *pDst++ = (__ROR(in, 16)) & 0xFF000000;
      *pDst++ = (__ROR(in, 24)) & 0xFF000000;
      *pDst++ = (in & 0xFF000000);
  
  #else
  
      *pDst++ = (in & 0xFF000000);
      *pDst++ = (__ROR(in, 24)) & 0xFF000000;
      *pDst++ = (__ROR(in, 16)) & 0xFF000000;
      *pDst++ = (__ROR(in, 8)) & 0xFF000000;
  
  #endif //              #ifndef ARM_MATH_BIG_ENDIAN
  
      /* Decrement the loop counter */
      blkCnt--;
    }
  
    /* If the blockSize is not a multiple of 4, compute any remaining output samples here.    
     ** No loop unrolling is used. */
    blkCnt = blockSize % 0x4u;
  
  #else
  
    /* Run the below code for Cortex-M0 */
  
    /* Loop over blockSize number of values */
    blkCnt = blockSize;
  
  #endif /* #ifndef ARM_MATH_CM0 */
  
    while(blkCnt > 0u)
    {
      /* C = (q31_t) A << 24 */
      /* convert from q7 to q31 and then store the results in the destination buffer */
      *pDst++ = (q31_t) * pIn++ << 24;
  
      /* Decrement the loop counter */
      blkCnt--;
    }
  
  }
  
  /**    
   * @} end of q7_to_x group    
   */
  