CMSIS DSP Software Library: arm_scale_f32.c Source File

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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:        15. July 2011
    00005 * $Revision:    V1.0.10
    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/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 0.0.7  2010/06/10
    00030 *    Misra-C changes done
    00031 * ---------------------------------------------------------------------------- */
    00032
    00033 #include "arm_math.h"
    00034
    00078 void arm_scale_f32(
    00079   float32_t * pSrc,
    00080   float32_t scale,
    00081   float32_t * pDst,
    00082   uint32_t blockSize)
    00083 {
    00084   uint32_t blkCnt;                               /* loop counter */
    00085
    00086 #ifndef ARM_MATH_CM0
    00087
    00088 /* Run the below code for Cortex-M4 and Cortex-M3 */
    00089   /*loop Unrolling */
    00090   blkCnt = blockSize >> 2u;
    00091
    00092   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00093    ** a second loop below computes the remaining 1 to 3 samples. */
    00094   while(blkCnt > 0u)
    00095   {
    00096     /* C = A * scale */
    00097     /* Scale the input and then store the results in the destination buffer. */
    00098     *pDst++ = (*pSrc++) * scale;
    00099     *pDst++ = (*pSrc++) * scale;
    00100     *pDst++ = (*pSrc++) * scale;
    00101     *pDst++ = (*pSrc++) * scale;
    00102
    00103     /* Decrement the loop counter */
    00104     blkCnt--;
    00105   }
    00106
    00107   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00108    ** No loop unrolling is used. */
    00109   blkCnt = blockSize % 0x4u;
    00110
    00111 #else
    00112
    00113   /* Run the below code for Cortex-M0 */
    00114
    00115   /* Initialize blkCnt with number of samples */
    00116   blkCnt = blockSize;
    00117
    00118 #endif /* #ifndef ARM_MATH_CM0 */
    00119
    00120   while(blkCnt > 0u)
    00121   {
    00122     /* C = A * scale */
    00123     /* Scale the input and then store the result in the destination buffer. */
    00124     *pDst++ = (*pSrc++) * scale;
    00125
    00126     /* Decrement the loop counter */
    00127     blkCnt--;
    00128   }
    00129 }
    00130

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