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# arm_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_scale_f32.c
    00009 *
    00010 * Description:  Multiplies a floating-point vector 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 0.0.7  2010/06/10
    00027 *    Misra-C changes done
    00028 * ---------------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00075 void arm_scale_f32(
    00076   float32_t * pSrc,
    00077   float32_t scale,
    00078   float32_t * pDst,
    00079   uint32_t blockSize)
    00080 {
    00081   uint32_t blkCnt;                               /* loop counter */
    00082
    00083   /*loop Unrolling */
    00084   blkCnt = blockSize >> 2u;
    00085
    00086   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00087    ** a second loop below computes the remaining 1 to 3 samples. */
    00088   while(blkCnt > 0u)
    00089   {
    00090     /* C = A * scale */
    00091     /* Scale the input and then store the results in the destination buffer. */
    00092     *pDst++ = (*pSrc++) * scale;
    00093     *pDst++ = (*pSrc++) * scale;
    00094     *pDst++ = (*pSrc++) * scale;
    00095     *pDst++ = (*pSrc++) * scale;
    00096
    00097     /* Decrement the loop counter */
    00098     blkCnt--;
    00099   }
    00100
    00101   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00102    ** No loop unrolling is used. */
    00103   blkCnt = blockSize % 0x4u;
    00104
    00105   while(blkCnt > 0u)
    00106   {
    00107     /* C = A * scale */
    00108     /* Scale the input and then store the result in the destination buffer. */
    00109     *pDst++ = (*pSrc++) * scale;
    00110
    00111     /* Decrement the loop counter */
    00112     blkCnt--;
    00113   }
    00114 }
    00115

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