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# arm_min_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_min_q31.c
    00009 *
    00010 * Description:  Minimum value of a Q31 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
    00030 #include "arm_math.h"
    00031
    00053 void arm_min_q31(
    00054   q31_t * pSrc,
    00055   uint32_t blockSize,
    00056   q31_t * pResult,
    00057   uint32_t * pIndex)
    00058 {
    00059   q31_t minVal, out;                             /* Temporary variables to store the output value. */
    00060   uint32_t blkCnt, outIndex;                     /* loop counter */
    00061
    00062   /* Initialise the index value to zero. */
    00063   outIndex = 0u;
    00064   /* Load first input value that act as reference value for comparision */
    00065   out = *pSrc++;
    00066
    00067 #ifndef ARM_MATH_CM0
    00068
    00069   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00070
    00071   /* Loop over blockSize number of values */
    00072   blkCnt = (blockSize - 1u);
    00073
    00074   do
    00075   {
    00076     /* Initialize minVal to the next consecutive values one by one */
    00077     minVal = *pSrc++;
    00078
    00079     /* compare for the minimum value */
    00080     if(out > minVal)
    00081     {
    00082       /* Update the minimum value and its index */
    00083       out = minVal;
    00084       outIndex = blockSize - blkCnt;
    00085     }
    00086
    00087     blkCnt--;
    00088
    00089   } while(blkCnt > 0u);
    00090
    00091 #else
    00092
    00093   /* Run the below code for Cortex-M0 */
    00094
    00095   /* Loop over blockSize -1 number of values */
    00096   blkCnt = (blockSize - 1u);
    00097
    00098   while(blkCnt > 0u)
    00099   {
    00100     /* Initialize minVal to the next consecutive values one by one */
    00101     minVal = *pSrc++;
    00102
    00103     /* compare for the minimum value */
    00104     if(out > minVal)
    00105     {
    00106       /* Update the minimum value and its index */
    00107       out = minVal;
    00108       outIndex = blockSize - blkCnt;
    00109     }
    00110
    00111     /* Decrement the loop counter */
    00112     blkCnt--;
    00113
    00114   }
    00115
    00116 #endif /* #ifndef ARM_MATH_CM0 */
    00117
    00118   /* Store the minimum value and its index into destination pointers */
    00119   *pResult = out;
    00120   *pIndex = outIndex;
    00121 }
    00122

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