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# arm_mat_scale_f32.c

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    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        29. November 2010
    00005 * $Revision:    V1.0.3
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_mat_scale_f32.c
    00009 *
    00010 * Description:  Multiplies a floating-point matrix by a scalar.
    00011 *
    00012 * Target Processor: Cortex-M4/Cortex-M3
    00013 *
    00014 * Version 1.0.3 2010/11/29
    00015 *    Re-organized the CMSIS folders and updated documentation.
    00016 *
    00017 * Version 1.0.2 2010/11/11
    00018 *    Documentation updated.
    00019 *
    00020 * Version 1.0.1 2010/10/05
    00021 *    Production release and review comments incorporated.
    00022 *
    00023 * Version 1.0.0 2010/09/20
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 0.0.5  2010/04/26
    00027 *    incorporated review comments and updated with latest CMSIS layer
    00028 *
    00029 * Version 0.0.3  2010/03/10
    00030 *    Initial version
    00031 * -------------------------------------------------------------------- */
    00032
    00033 #include "arm_math.h"
    00034
    00072 arm_status arm_mat_scale_f32(
    00073   const arm_matrix_instance_f32 * pSrc,
    00074   float32_t scale,
    00075   arm_matrix_instance_f32 * pDst)
    00076 {
    00077   float32_t *pIn = pSrc->pData;                  /* input data matrix pointer */
    00078   float32_t *pOut = pDst->pData;                 /* output data matrix pointer */
    00079   uint32_t numSamples;                           /* total number of elements in the matrix */
    00080   uint32_t blkCnt;                               /* loop counters */
    00081   arm_status status;                             /* status of matrix scaling     */
    00082
    00083 #ifdef ARM_MATH_MATRIX_CHECK
    00084   /* Check for matrix mismatch condition */
    00085   if((pSrc->numRows != pDst->numRows) || (pSrc->numCols != pDst->numCols))
    00086   {
    00087     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00088     status = ARM_MATH_SIZE_MISMATCH;
    00089   }
    00090   else
    00091 #endif
    00092   {
    00093     /* Total number of samples in the input matrix */
    00094     numSamples = (uint32_t) pSrc->numRows * pSrc->numCols;
    00095
    00096     /* Loop Unrolling */
    00097     blkCnt = numSamples >> 2;
    00098
    00099     /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00100      ** a second loop below computes the remaining 1 to 3 samples. */
    00101     while(blkCnt > 0u)
    00102     {
    00103       /* C(m,n) = A(m,n) * scale */
    00104       /* Scaling and results are stored in the destination buffer. */
    00105       *pOut++ = (*pIn++) * scale;
    00106       *pOut++ = (*pIn++) * scale;
    00107       *pOut++ = (*pIn++) * scale;
    00108       *pOut++ = (*pIn++) * scale;
    00109
    00110       /* Decrement the numSamples loop counter */
    00111       blkCnt--;
    00112     }
    00113
    00114     /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00115      ** No loop unrolling is used. */
    00116     blkCnt = numSamples % 0x4u;
    00117
    00118     while(blkCnt > 0u)
    00119     {
    00120       /* C(m,n) = A(m,n) * scale */
    00121       /* The results are stored in the destination buffer. */
    00122       *pOut++ = (*pIn++) * scale;
    00123
    00124       /* Decrement the loop counter */
    00125       blkCnt--;
    00126     }
    00127
    00128     /* Set status as ARM_MATH_SUCCESS */
    00129     status = ARM_MATH_SUCCESS;
    00130   }
    00131
    00132   /* Return to application */
    00133   return (status);
    00134 }
    00135

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