text: /* ----------------------------------------------------------------------    
  * Copyright (C) 2010 ARM Limited. All rights reserved.    
  *    
  * $Date:        15. February 2012  
  * $Revision: 	V1.1.0  
  *    
  * Project: 	    CMSIS DSP Library    
  * Title:		arm_scale_f32.c    
  *    
  * Description:	Multiplies a floating-point vector by a scalar.    
  *    
  * 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    
  *    
  * Version 0.0.7  2010/06/10     
  *    Misra-C changes done    
  * ---------------------------------------------------------------------------- */
  
  #include "arm_math.h"
  
  /**        
   * @ingroup groupMath        
   */
  
  /**        
   * @defgroup scale Vector Scale        
   *        
   * Multiply a vector by a scalar value.  For floating-point data, the algorithm used is:        
   *        
   * <pre>        
   *     pDst[n] = pSrc[n] * scale,   0 <= n < blockSize.        
   * </pre>        
   *        
   * In the fixed-point Q7, Q15, and Q31 functions, <code>scale</code> is represented by        
   * a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>.        
   * The shift allows the gain of the scaling operation to exceed 1.0.        
   * The algorithm used with fixed-point data is:        
   *        
   * <pre>        
   *     pDst[n] = (pSrc[n] * scaleFract) << shift,   0 <= n < blockSize.        
   * </pre>        
   *        
   * The overall scale factor applied to the fixed-point data is        
   * <pre>        
   *     scale = scaleFract * 2^shift.        
   * </pre>        
   */
  
  /**        
   * @addtogroup scale        
   * @{        
   */
  
  /**        
   * @brief Multiplies a floating-point vector by a scalar.        
   * @param[in]       *pSrc points to the input vector        
   * @param[in]       scale scale factor to be applied        
   * @param[out]      *pDst points to the output vector        
   * @param[in]       blockSize number of samples in the vector        
   * @return none.        
   */
  
  
  void arm_scale_f32(
    float32_t * pSrc,
    float32_t scale,
    float32_t * pDst,
    uint32_t blockSize)
  {
    uint32_t blkCnt;                               /* loop counter */
  #ifndef ARM_MATH_CM0
  
  /* Run the below code for Cortex-M4 and Cortex-M3 */
    float32_t in1, in2, in3, in4;                  /* temporary variabels */
  
    /*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 = A * scale */
      /* Scale the input and then store the results in the destination buffer. */
      /* read input samples from source */
      in1 = *pSrc;
      in2 = *(pSrc + 1);
  
      /* multiply with scaling factor */
      in1 = in1 * scale;
  
      /* read input sample from source */
      in3 = *(pSrc + 2);
  
      /* multiply with scaling factor */
      in2 = in2 * scale;
  
      /* read input sample from source */
      in4 = *(pSrc + 3);
  
      /* multiply with scaling factor */
      in3 = in3 * scale;
      in4 = in4 * scale;
      /* store the result to destination */
      *pDst = in1;
      *(pDst + 1) = in2;
      *(pDst + 2) = in3;
      *(pDst + 3) = in4;
  
      /* update pointers to process next samples */
      pSrc += 4u;
      pDst += 4u;
  
      /* 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 */
  
    /* Initialize blkCnt with number of samples */
    blkCnt = blockSize;
  
  #endif /* #ifndef ARM_MATH_CM0 */
  
    while(blkCnt > 0u)
    {
      /* C = A * scale */
      /* Scale the input and then store the result in the destination buffer. */
      *pDst++ = (*pSrc++) * scale;
  
      /* Decrement the loop counter */
      blkCnt--;
    }
  }
  
  /**        
   * @} end of scale group        
   */
  