CMSIS DSP Software Library: arm_copy_q15.c Source File

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# arm_copy_q15.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_copy_q15.c
    00009 *
    00010 * Description:  Copies the elements of a Q15 vector.
    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
    00052 void arm_copy_q15(
    00053   q15_t * pSrc,
    00054   q15_t * pDst,
    00055   uint32_t blockSize)
    00056 {
    00057   uint32_t blkCnt;                               /* loop counter */
    00058
    00059 #ifndef ARM_MATH_CM0
    00060
    00061   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00062
    00063   q15_t in1, in2;                                /* Temporary variables */
    00064
    00065
    00066   /*loop Unrolling */
    00067   blkCnt = blockSize >> 2u;
    00068
    00069   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00070    ** a second loop below computes the remaining 1 to 3 samples. */
    00071   while(blkCnt > 0u)
    00072   {
    00073     /* C = A */
    00074     /* Read two inputs */
    00075     in1 = *pSrc++;
    00076     in2 = *pSrc++;
    00077
    00078 #ifndef ARM_MATH_BIG_ENDIAN
    00079
    00080     /* Store the values in the destination buffer by packing the two inputs */
    00081     *__SIMD32(pDst)++ = __PKHBT(in1, in2, 16);
    00082
    00083     in1 = *pSrc++;
    00084     in2 = *pSrc++;
    00085     *__SIMD32(pDst)++ = __PKHBT(in1, in2, 16);
    00086
    00087 #else
    00088
    00089     /* Store the values in the destination buffer by packing the two inputs */
    00090     *__SIMD32(pDst)++ = __PKHBT(in2, in1, 16);
    00091
    00092     in1 = *pSrc++;
    00093     in2 = *pSrc++;
    00094     *__SIMD32(pDst)++ = __PKHBT(in2, in1, 16);
    00095
    00096
    00097 #endif /*      #ifndef ARM_MATH_BIG_ENDIAN     */
    00098
    00099     /* Decrement the loop counter */
    00100     blkCnt--;
    00101   }
    00102
    00103   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00104    ** No loop unrolling is used. */
    00105   blkCnt = blockSize % 0x4u;
    00106
    00107
    00108 #else
    00109
    00110   /* Run the below code for Cortex-M0 */
    00111
    00112   /* Loop over blockSize number of values */
    00113   blkCnt = blockSize;
    00114
    00115 #endif /* #ifndef ARM_MATH_CM0 */
    00116
    00117   while(blkCnt > 0u)
    00118   {
    00119     /* C = A */
    00120     /* Copy and then store the value in the destination buffer */
    00121     *pDst++ = *pSrc++;
    00122
    00123     /* Decrement the loop counter */
    00124     blkCnt--;
    00125   }
    00126 }
    00127

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