CMSIS DSP Software Library: arm_mat_sub_q31.c Source File

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# arm_mat_sub_q31.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_q31.c
    00009 *
    00010 * Description:  Q31 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
    00062 arm_status arm_mat_sub_q31(
    00063   const arm_matrix_instance_q31 * pSrcA,
    00064   const arm_matrix_instance_q31 * pSrcB,
    00065   arm_matrix_instance_q31 * pDst)
    00066 {
    00067   q31_t *pIn1 = pSrcA->pData;                    /* input data matrix pointer A */
    00068   q31_t *pIn2 = pSrcB->pData;                    /* input data matrix pointer B */
    00069   q31_t *pOut = pDst->pData;                     /* output data matrix pointer */
    00070   uint32_t numSamples;                           /* total number of elements in the matrix  */
    00071   uint32_t blkCnt;                               /* loop counters */
    00072   arm_status status;                             /* status of matrix subtraction */
    00073
    00074
    00075 #ifdef ARM_MATH_MATRIX_CHECK
    00076
    00077
    00078   /* Check for matrix mismatch condition  */
    00079   if((pSrcA->numRows != pSrcB->numRows) ||
    00080      (pSrcA->numCols != pSrcB->numCols) ||
    00081      (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
    00082   {
    00083     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00084     status = ARM_MATH_SIZE_MISMATCH;
    00085   }
    00086   else
    00087 #endif /*    #ifdef ARM_MATH_MATRIX_CHECK    */
    00088
    00089   {
    00090     /* Total number of samples in the input matrix */
    00091     numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
    00092
    00093 #ifndef ARM_MATH_CM0
    00094
    00095     /* Run the below code for Cortex-M4 and Cortex-M3 */
    00096
    00097     /* Loop Unrolling */
    00098     blkCnt = numSamples >> 2u;
    00099
    00100     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00101      ** a second loop below computes the remaining 1 to 3 samples. */
    00102     while(blkCnt > 0u)
    00103     {
    00104       /* C(m,n) = A(m,n) - B(m,n) */
    00105       /* Subtract, saturate and then store the results in the destination buffer. */
    00106       *pOut++ = __QSUB(*pIn1++, *pIn2++);
    00107       *pOut++ = __QSUB(*pIn1++, *pIn2++);
    00108       *pOut++ = __QSUB(*pIn1++, *pIn2++);
    00109       *pOut++ = __QSUB(*pIn1++, *pIn2++);
    00110
    00111       /* Decrement the loop counter */
    00112       blkCnt--;
    00113     }
    00114
    00115     /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00116      ** No loop unrolling is used. */
    00117     blkCnt = numSamples % 0x4u;
    00118
    00119     while(blkCnt > 0u)
    00120     {
    00121       /* C(m,n) = A(m,n) - B(m,n) */
    00122       /* Subtract, saturate and then store the results in the destination buffer. */
    00123       *pOut++ = __QSUB(*pIn1++, *pIn2++);
    00124
    00125       /* Decrement the loop counter */
    00126       blkCnt--;
    00127     }
    00128
    00129 #else
    00130
    00131     /* Run the below code for Cortex-M0 */
    00132
    00133     /* Initialize blkCnt with number of samples */
    00134     blkCnt = numSamples;
    00135
    00136     while(blkCnt > 0u)
    00137     {
    00138       /* C(m,n) = A(m,n) - B(m,n) */
    00139       /* Subtract, saturate and then store the results in the destination buffer. */
    00140       *pOut++ = clip_q63_to_q31(((q63_t) (*pIn1++)) - (*pIn2++));
    00141
    00142       /* Decrement the loop counter */
    00143       blkCnt--;
    00144     }
    00145
    00146 #endif /* #ifndef ARM_MATH_CM0 */
    00147
    00148     /* Set status as ARM_MATH_SUCCESS */
    00149     status = ARM_MATH_SUCCESS;
    00150   }
    00151
    00152   /* Return to application */
    00153   return (status);
    00154 }
    00155

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