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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_cmplx_mult_real_f32.c    
  9. *    
  10. * Description:  Floating-point complex by real multiplication    
  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 groupCmplxMath        
  45.  */
  46.  
  47. /**        
  48.  * @defgroup CmplxByRealMult Complex-by-Real Multiplication        
  49.  *        
  50.  * Multiplies a complex vector by a real vector and generates a complex result.        
  51.  * The data in the complex arrays is stored in an interleaved fashion        
  52.  * (real, imag, real, imag, ...).        
  53.  * The parameter <code>numSamples</code> represents the number of complex        
  54.  * samples processed.  The complex arrays have a total of <code>2*numSamples</code>        
  55.  * real values while the real array has a total of <code>numSamples</code>        
  56.  * real values.        
  57.  *        
  58.  * The underlying algorithm is used:        
  59.  *        
  60.  * <pre>        
  61.  * for(n=0; n<numSamples; n++) {        
  62.  *     pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n];        
  63.  *     pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n];        
  64.  * }        
  65.  * </pre>        
  66.  *        
  67.  * There are separate functions for floating-point, Q15, and Q31 data types.        
  68.  */
  69.  
  70. /**        
  71.  * @addtogroup CmplxByRealMult        
  72.  * @{        
  73.  */
  74.  
  75.  
  76. /**        
  77.  * @brief  Floating-point complex-by-real multiplication        
  78.  * @param[in]  *pSrcCmplx points to the complex input vector        
  79.  * @param[in]  *pSrcReal points to the real input vector        
  80.  * @param[out]  *pCmplxDst points to the complex output vector        
  81.  * @param[in]  numSamples number of samples in each vector        
  82.  * @return none.        
  83.  */
  84.  
  85. void arm_cmplx_mult_real_f32(
  86.   float32_t * pSrcCmplx,
  87.   float32_t * pSrcReal,
  88.   float32_t * pCmplxDst,
  89.   uint32_t numSamples)
  90. {
  91.   float32_t in;                                  /* Temporary variable to store input value */
  92.   uint32_t blkCnt;                               /* loop counters */
  93.  
  94. #ifndef ARM_MATH_CM0_FAMILY
  95.  
  96.   /* Run the below code for Cortex-M4 and Cortex-M3 */
  97.   float32_t inA1, inA2, inA3, inA4;              /* Temporary variables to hold input data */
  98.   float32_t inA5, inA6, inA7, inA8;              /* Temporary variables to hold input data */
  99.   float32_t inB1, inB2, inB3, inB4;              /* Temporary variables to hold input data */
  100.   float32_t out1, out2, out3, out4;              /* Temporary variables to hold output data */
  101.   float32_t out5, out6, out7, out8;              /* Temporary variables to hold output data */
  102.  
  103.   /* loop Unrolling */
  104.   blkCnt = numSamples >> 2u;
  105.  
  106.   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.        
  107.    ** a second loop below computes the remaining 1 to 3 samples. */
  108.   while(blkCnt > 0u)
  109.   {
  110.     /* C[2 * i] = A[2 * i] * B[i].            */
  111.     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
  112.     /* read input from complex input buffer */
  113.     inA1 = pSrcCmplx[0];
  114.     inA2 = pSrcCmplx[1];
  115.     /* read input from real input buffer */
  116.     inB1 = pSrcReal[0];
  117.  
  118.     /* read input from complex input buffer */
  119.     inA3 = pSrcCmplx[2];
  120.  
  121.     /* multiply complex buffer real input with real buffer input */
  122.     out1 = inA1 * inB1;
  123.  
  124.     /* read input from complex input buffer */
  125.     inA4 = pSrcCmplx[3];
  126.  
  127.     /* multiply complex buffer imaginary input with real buffer input */
  128.     out2 = inA2 * inB1;
  129.  
  130.     /* read input from real input buffer */
  131.     inB2 = pSrcReal[1];
  132.     /* read input from complex input buffer */
  133.     inA5 = pSrcCmplx[4];
  134.  
  135.     /* multiply complex buffer real input with real buffer input */
  136.     out3 = inA3 * inB2;
  137.  
  138.     /* read input from complex input buffer */
  139.     inA6 = pSrcCmplx[5];
  140.     /* read input from real input buffer */
  141.     inB3 = pSrcReal[2];
  142.  
  143.     /* multiply complex buffer imaginary input with real buffer input */
  144.     out4 = inA4 * inB2;
  145.  
  146.     /* read input from complex input buffer */
  147.     inA7 = pSrcCmplx[6];
  148.  
  149.     /* multiply complex buffer real input with real buffer input */
  150.     out5 = inA5 * inB3;
  151.  
  152.     /* read input from complex input buffer */
  153.     inA8 = pSrcCmplx[7];
  154.  
  155.     /* multiply complex buffer imaginary input with real buffer input */
  156.     out6 = inA6 * inB3;
  157.  
  158.     /* read input from real input buffer */
  159.     inB4 = pSrcReal[3];
  160.  
  161.     /* store result to destination bufer */
  162.     pCmplxDst[0] = out1;
  163.  
  164.     /* multiply complex buffer real input with real buffer input */
  165.     out7 = inA7 * inB4;
  166.  
  167.     /* store result to destination bufer */
  168.     pCmplxDst[1] = out2;
  169.  
  170.     /* multiply complex buffer imaginary input with real buffer input */
  171.     out8 = inA8 * inB4;
  172.  
  173.     /* store result to destination bufer */
  174.     pCmplxDst[2] = out3;
  175.     pCmplxDst[3] = out4;
  176.     pCmplxDst[4] = out5;
  177.  
  178.     /* incremnet complex input buffer by 8 to process next samples */
  179.     pSrcCmplx += 8u;
  180.  
  181.     /* store result to destination bufer */
  182.     pCmplxDst[5] = out6;
  183.  
  184.     /* increment real input buffer by 4 to process next samples */
  185.     pSrcReal += 4u;
  186.  
  187.     /* store result to destination bufer */
  188.     pCmplxDst[6] = out7;
  189.     pCmplxDst[7] = out8;
  190.  
  191.     /* increment destination buffer by 8 to process next sampels */
  192.     pCmplxDst += 8u;
  193.  
  194.     /* Decrement the numSamples loop counter */
  195.     blkCnt--;
  196.   }
  197.  
  198.   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.        
  199.    ** No loop unrolling is used. */
  200.   blkCnt = numSamples % 0x4u;
  201.  
  202. #else
  203.  
  204.   /* Run the below code for Cortex-M0 */
  205.   blkCnt = numSamples;
  206.  
  207. #endif /* #ifndef ARM_MATH_CM0_FAMILY */
  208.  
  209.   while(blkCnt > 0u)
  210.   {
  211.     /* C[2 * i] = A[2 * i] * B[i].            */
  212.     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
  213.     in = *pSrcReal++;
  214.     /* store the result in the destination buffer. */
  215.     *pCmplxDst++ = (*pSrcCmplx++) * (in);
  216.     *pCmplxDst++ = (*pSrcCmplx++) * (in);
  217.  
  218.     /* Decrement the numSamples loop counter */
  219.     blkCnt--;
  220.   }
  221. }
  222.  
  223. /**        
  224.  * @} end of CmplxByRealMult group        
  225.  */
  226.