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  1. /* ----------------------------------------------------------------------    
  2. * Copyright (C) 2010-2014 ARM Limited. All rights reserved.    
  3. *    
  4. * $Date:        19. March 2015
  5. * $Revision:    V.1.4.5  
  6. *    
  7. * Project:          CMSIS DSP Library    
  8. * Title:                arm_fill_q7.c    
  9. *    
  10. * Description:  Fills a constant value into a Q7 vector.  
  11. *    
  12. * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
  13. *  
  14. * Redistribution and use in source and binary forms, with or without
  15. * modification, are permitted provided that the following conditions
  16. * are met:
  17. *   - Redistributions of source code must retain the above copyright
  18. *     notice, this list of conditions and the following disclaimer.
  19. *   - Redistributions in binary form must reproduce the above copyright
  20. *     notice, this list of conditions and the following disclaimer in
  21. *     the documentation and/or other materials provided with the
  22. *     distribution.
  23. *   - Neither the name of ARM LIMITED nor the names of its contributors
  24. *     may be used to endorse or promote products derived from this
  25. *     software without specific prior written permission.
  26. *
  27. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30. * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  31. * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  32. * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  33. * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  35. * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  37. * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38. * POSSIBILITY OF SUCH DAMAGE.    
  39. * -------------------------------------------------------------------- */
  40.  
  41. #include "arm_math.h"
  42.  
  43. /**    
  44.  * @ingroup groupSupport    
  45.  */
  46.  
  47. /**    
  48.  * @addtogroup Fill    
  49.  * @{    
  50.  */
  51.  
  52. /**    
  53.  * @brief Fills a constant value into a Q7 vector.    
  54.  * @param[in]       value input value to be filled  
  55.  * @param[out]      *pDst points to output vector    
  56.  * @param[in]       blockSize length of the output vector  
  57.  * @return none.    
  58.  *    
  59.  */
  60.  
  61. void arm_fill_q7(
  62.   q7_t value,
  63.   q7_t * pDst,
  64.   uint32_t blockSize)
  65. {
  66.   uint32_t blkCnt;                               /* loop counter */
  67.  
  68. #ifndef ARM_MATH_CM0_FAMILY
  69.  
  70.   /* Run the below code for Cortex-M4 and Cortex-M3 */
  71.  
  72.   q31_t packedValue;                             /* value packed to 32 bits */
  73.  
  74.   /*loop Unrolling */
  75.   blkCnt = blockSize >> 2u;
  76.  
  77.   /* Packing four 8 bit values to 32 bit value in order to use SIMD */
  78.   packedValue = __PACKq7(value, value, value, value);
  79.  
  80.   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
  81.    ** a second loop below computes the remaining 1 to 3 samples. */
  82.   while(blkCnt > 0u)
  83.   {
  84.     /* C = value */
  85.     /* Fill the value in the destination buffer */
  86.     *__SIMD32(pDst)++ = packedValue;
  87.  
  88.     /* Decrement the loop counter */
  89.     blkCnt--;
  90.   }
  91.  
  92.   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.    
  93.    ** No loop unrolling is used. */
  94.   blkCnt = blockSize % 0x4u;
  95.  
  96. #else
  97.  
  98.   /* Run the below code for Cortex-M0 */
  99.  
  100.   /* Loop over blockSize number of values */
  101.   blkCnt = blockSize;
  102.  
  103. #endif /* #ifndef ARM_MATH_CM0_FAMILY */
  104.  
  105.   while(blkCnt > 0u)
  106.   {
  107.     /* C = value */
  108.     /* Fill the value in the destination buffer */
  109.     *pDst++ = value;
  110.  
  111.     /* Decrement the loop counter */
  112.     blkCnt--;
  113.   }
  114. }
  115.  
  116. /**    
  117.  * @} end of Fill group    
  118.  */
  119.