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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_mat_sub_f32.c    
  9. *    
  10. * Description:  Floating-point matrix subtraction.    
  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 groupMatrix        
  45.  */
  46.  
  47. /**        
  48.  * @defgroup MatrixSub Matrix Subtraction        
  49.  *        
  50.  * Subtract two matrices.        
  51.  * \image html MatrixSubtraction.gif "Subraction of two 3 x 3 matrices"        
  52.  *        
  53.  * The functions check to make sure that        
  54.  * <code>pSrcA</code>, <code>pSrcB</code>, and <code>pDst</code> have the same        
  55.  * number of rows and columns.        
  56.  */
  57.  
  58. /**        
  59.  * @addtogroup MatrixSub        
  60.  * @{        
  61.  */
  62.  
  63. /**        
  64.  * @brief Floating-point matrix subtraction        
  65.  * @param[in]       *pSrcA points to the first input matrix structure        
  66.  * @param[in]       *pSrcB points to the second input matrix structure        
  67.  * @param[out]      *pDst points to output matrix structure        
  68.  * @return              The function returns either        
  69.  * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.        
  70.  */
  71.  
  72. arm_status arm_mat_sub_f32(
  73.   const arm_matrix_instance_f32 * pSrcA,
  74.   const arm_matrix_instance_f32 * pSrcB,
  75.   arm_matrix_instance_f32 * pDst)
  76. {
  77.   float32_t *pIn1 = pSrcA->pData;                /* input data matrix pointer A */
  78.   float32_t *pIn2 = pSrcB->pData;                /* input data matrix pointer B */
  79.   float32_t *pOut = pDst->pData;                 /* output data matrix pointer  */
  80.  
  81. #ifndef ARM_MATH_CM0_FAMILY
  82.  
  83.   float32_t inA1, inA2, inB1, inB2, out1, out2;  /* temporary variables */
  84.  
  85. #endif //      #ifndef ARM_MATH_CM0_FAMILY
  86.  
  87.   uint32_t numSamples;                           /* total number of elements in the matrix  */
  88.   uint32_t blkCnt;                               /* loop counters */
  89.   arm_status status;                             /* status of matrix subtraction */
  90.  
  91. #ifdef ARM_MATH_MATRIX_CHECK
  92.   /* Check for matrix mismatch condition */
  93.   if((pSrcA->numRows != pSrcB->numRows) ||
  94.      (pSrcA->numCols != pSrcB->numCols) ||
  95.      (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
  96.   {
  97.     /* Set status as ARM_MATH_SIZE_MISMATCH */
  98.     status = ARM_MATH_SIZE_MISMATCH;
  99.   }
  100.   else
  101. #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
  102.   {
  103.     /* Total number of samples in the input matrix */
  104.     numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
  105.  
  106. #ifndef ARM_MATH_CM0_FAMILY
  107.  
  108.     /* Run the below code for Cortex-M4 and Cortex-M3 */
  109.  
  110.     /* Loop Unrolling */
  111.     blkCnt = numSamples >> 2u;
  112.  
  113.     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
  114.      ** a second loop below computes the remaining 1 to 3 samples. */
  115.     while(blkCnt > 0u)
  116.     {
  117.       /* C(m,n) = A(m,n) - B(m,n) */
  118.       /* Subtract and then store the results in the destination buffer. */
  119.       /* Read values from source A */
  120.       inA1 = pIn1[0];
  121.  
  122.       /* Read values from source B */
  123.       inB1 = pIn2[0];
  124.  
  125.       /* Read values from source A */
  126.       inA2 = pIn1[1];
  127.  
  128.       /* out = sourceA - sourceB */
  129.       out1 = inA1 - inB1;
  130.  
  131.       /* Read values from source B */
  132.       inB2 = pIn2[1];
  133.  
  134.       /* Read values from source A */
  135.       inA1 = pIn1[2];
  136.  
  137.       /* out = sourceA - sourceB */
  138.       out2 = inA2 - inB2;
  139.  
  140.       /* Read values from source B */
  141.       inB1 = pIn2[2];
  142.  
  143.       /* Store result in destination */
  144.       pOut[0] = out1;
  145.       pOut[1] = out2;
  146.  
  147.       /* Read values from source A */
  148.       inA2 = pIn1[3];
  149.  
  150.       /* Read values from source B */
  151.       inB2 = pIn2[3];
  152.  
  153.       /* out = sourceA - sourceB */
  154.       out1 = inA1 - inB1;
  155.  
  156.  
  157.       /* out = sourceA - sourceB */
  158.       out2 = inA2 - inB2;
  159.  
  160.       /* Store result in destination */
  161.       pOut[2] = out1;
  162.  
  163.       /* Store result in destination */
  164.       pOut[3] = out2;
  165.  
  166.  
  167.       /* update pointers to process next sampels */
  168.       pIn1 += 4u;
  169.       pIn2 += 4u;
  170.       pOut += 4u;
  171.  
  172.       /* Decrement the loop counter */
  173.       blkCnt--;
  174.     }
  175.  
  176.     /* If the numSamples is not a multiple of 4, compute any remaining output samples here.    
  177.      ** No loop unrolling is used. */
  178.     blkCnt = numSamples % 0x4u;
  179.  
  180. #else
  181.  
  182.     /* Run the below code for Cortex-M0 */
  183.  
  184.     /* Initialize blkCnt with number of samples */
  185.     blkCnt = numSamples;
  186.  
  187. #endif /* #ifndef ARM_MATH_CM0_FAMILY */
  188.  
  189.     while(blkCnt > 0u)
  190.     {
  191.       /* C(m,n) = A(m,n) - B(m,n) */
  192.       /* Subtract and then store the results in the destination buffer. */
  193.       *pOut++ = (*pIn1++) - (*pIn2++);
  194.  
  195.       /* Decrement the loop counter */
  196.       blkCnt--;
  197.     }
  198.  
  199.     /* Set status as ARM_MATH_SUCCESS */
  200.     status = ARM_MATH_SUCCESS;
  201.   }
  202.  
  203.   /* Return to application */
  204.   return (status);
  205. }
  206.  
  207. /**        
  208.  * @} end of MatrixSub group        
  209.  */
  210.