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# arm_mat_sub_f32.c

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    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        15. July 2011
    00005 * $Revision:    V1.0.10
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_mat_sub_f32.c
    00009 *
    00010 * Description:  Floating-point matrix subtraction.
    00011 *
    00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
    00013 *
    00014 * Version 1.0.10 2011/7/15
    00015 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00016 *
    00017 * Version 1.0.3 2010/11/29
    00018 *    Re-organized the CMSIS folders and updated documentation.
    00019 *
    00020 * Version 1.0.2 2010/11/11
    00021 *    Documentation updated.
    00022 *
    00023 * Version 1.0.1 2010/10/05
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 1.0.0 2010/09/20
    00027 *    Production release and review comments incorporated.
    00028 *
    00029 * Version 0.0.5  2010/04/26
    00030 *    incorporated review comments and updated with latest CMSIS layer
    00031 *
    00032 * Version 0.0.3  2010/03/10
    00033 *    Initial version
    00034 * -------------------------------------------------------------------- */
    00035
    00036 #include "arm_math.h"
    00037
    00067 arm_status arm_mat_sub_f32(
    00068   const arm_matrix_instance_f32 * pSrcA,
    00069   const arm_matrix_instance_f32 * pSrcB,
    00070   arm_matrix_instance_f32 * pDst)
    00071 {
    00072   float32_t *pIn1 = pSrcA->pData;                /* input data matrix pointer A */
    00073   float32_t *pIn2 = pSrcB->pData;                /* input data matrix pointer B */
    00074   float32_t *pOut = pDst->pData;                 /* output data matrix pointer  */
    00075   uint32_t numSamples;                           /* total number of elements in the matrix  */
    00076   uint32_t blkCnt;                               /* loop counters */
    00077   arm_status status;                             /* status of matrix subtraction */
    00078
    00079 #ifdef ARM_MATH_MATRIX_CHECK
    00080
    00081
    00082   /* Check for matrix mismatch condition */
    00083   if((pSrcA->numRows != pSrcB->numRows) ||
    00084      (pSrcA->numCols != pSrcB->numCols) ||
    00085      (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
    00086   {
    00087     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00088     status = ARM_MATH_SIZE_MISMATCH;
    00089   }
    00090   else
    00091 #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
    00092
    00093   {
    00094     /* Total number of samples in the input matrix */
    00095     numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
    00096
    00097 #ifndef ARM_MATH_CM0
    00098
    00099     /* Run the below code for Cortex-M4 and Cortex-M3 */
    00100
    00101     /* Loop Unrolling */
    00102     blkCnt = numSamples >> 2u;
    00103
    00104     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00105      ** a second loop below computes the remaining 1 to 3 samples. */
    00106     while(blkCnt > 0u)
    00107     {
    00108       /* C(m,n) = A(m,n) - B(m,n) */
    00109       /* Subtract and then store the results in the destination buffer. */
    00110       *pOut++ = (*pIn1++) - (*pIn2++);
    00111       *pOut++ = (*pIn1++) - (*pIn2++);
    00112       *pOut++ = (*pIn1++) - (*pIn2++);
    00113       *pOut++ = (*pIn1++) - (*pIn2++);
    00114
    00115       /* Decrement the loop counter */
    00116       blkCnt--;
    00117     }
    00118
    00119     /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00120      ** No loop unrolling is used. */
    00121     blkCnt = numSamples % 0x4u;
    00122
    00123 #else
    00124
    00125     /* Run the below code for Cortex-M0 */
    00126
    00127     /* Initialize blkCnt with number of samples */
    00128     blkCnt = numSamples;
    00129
    00130 #endif /* #ifndef ARM_MATH_CM0 */
    00131
    00132     while(blkCnt > 0u)
    00133     {
    00134       /* C(m,n) = A(m,n) - B(m,n) */
    00135       /* Subtract and then store the results in the destination buffer. */
    00136       *pOut++ = (*pIn1++) - (*pIn2++);
    00137
    00138       /* Decrement the loop counter */
    00139       blkCnt--;
    00140     }
    00141     /* Set status as ARM_MATH_SUCCESS */
    00142     status = ARM_MATH_SUCCESS;
    00143   }
    00144
    00145   /* Return to application */
    00146   return (status);
    00147 }
    00148

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