arm_fill_q31.c

Go to the documentation of this file.

/* ----------------------------------------------------------------------      
* Copyright (C) 2011 ARM Limited. All rights reserved. 
*      
* $Date:        15. December 2011   
* $Revision:    V2.0.0  
*      
* Project:      Cortex-R DSP Library 
* Title:        arm_fill_q31.c      
*      
* Description:  Fills a constant value into a Q31 vector.     
*      
* Target Processor:          Cortex-R4/R5
*
* Version 1.0.0 2011/03/08
*     Alpha release.
*
* Version 1.0.1 2011/09/30
*     Beta release.
*
* Version 2.0.0 2011/12/15
*     Final release. 
* 
* -------------------------------------------------------------------- */     
#include "arm_math.h"     
     
void arm_fill_q31(     
  q31_t value,     
  q31_t * pDst,     
  uint32_t blockSize)     
{     
  uint32_t blkCnt;                               /* loop counter */     
  q31_t value1 = value;  
  q31_t value2 = value;  
  q31_t value3 = value;  
  q31_t value4 = value;  
     
     
  /*loop Unrolling */     
  blkCnt = blockSize >> 3u;     
     
  /* First part of the processing with loop unrolling.  Compute 8 outputs at a time.      
   ** a second loop below computes the remaining 1 to 7 samples. */     
  while(blkCnt > 0u)     
  {     
    /* C = value */     
    /* Fill the value in the destination buffer */     
    pDst[0] = value1;  
    pDst[1] = value2;  
    pDst[2] = value3;  
    pDst[3] = value4;  
    pDst[4] = value1;  
    pDst[5] = value2;  
    pDst[6] = value3;  
    pDst[7] = value4;  
    pDst += 8u;  
  
    /* Decrement the loop counter */     
    blkCnt--;     
  }     
     
  /* If the blockSize is not a multiple of 8, compute any remaining output samples here.      
   ** No loop unrolling is used. */     
  blkCnt = blockSize % 0x8u;     
     
  while(blkCnt > 0u)     
  {     
    /* C = value */     
    /* Fill the value in the destination buffer */     
    *pDst++ = value;     
     
    /* Decrement the loop counter */     
    blkCnt--;     
  }     
}