diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_q31.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_q31.c | 124 |
1 files changed, 55 insertions, 69 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_q31.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_q31.c index fc4c1556c..e25eb47ef 100644 --- a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_q31.c +++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_q31.c @@ -3,13 +3,13 @@ * Title: arm_min_q31.c * Description: Minimum value of a Q31 vector * - * $Date: 27. January 2017 - * $Revision: V.1.5.1 + * $Date: 18. March 2019 + * $Revision: V1.6.0 * * Target Processor: Cortex-M cores * -------------------------------------------------------------------- */ /* - * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. + * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * @@ -29,127 +29,113 @@ #include "arm_math.h" /** - * @ingroup groupStats + @ingroup groupStats */ /** - * @addtogroup Min - * @{ + @addtogroup Min + @{ */ - /** - * @brief Minimum value of a Q31 vector. - * @param[in] *pSrc points to the input vector - * @param[in] blockSize length of the input vector - * @param[out] *pResult minimum value returned here - * @param[out] *pIndex index of minimum value returned here - * @return none. + @brief Minimum value of a Q31 vector. + @param[in] pSrc points to the input vector + @param[in] blockSize number of samples in input vector + @param[out] pResult minimum value returned here + @param[out] pIndex index of minimum value returned here + @return none */ void arm_min_q31( - q31_t * pSrc, - uint32_t blockSize, - q31_t * pResult, - uint32_t * pIndex) + const q31_t * pSrc, + uint32_t blockSize, + q31_t * pResult, + uint32_t * pIndex) { -#if defined (ARM_MATH_DSP) - /* Run the below code for Cortex-M4 and Cortex-M3 */ + q31_t minVal, out; /* Temporary variables to store the output value. */ + uint32_t blkCnt, outIndex; /* Loop counter */ - q31_t minVal1, minVal2, out; /* Temporary variables to store the output value. */ - uint32_t blkCnt, outIndex, count; /* loop counter */ +#if defined (ARM_MATH_LOOPUNROLL) + uint32_t index; /* index of maximum value */ +#endif - /* Initialise the count value. */ - count = 0U; - /* Initialise the index value to zero. */ + /* Initialise index value to zero. */ outIndex = 0U; /* Load first input value that act as reference value for comparision */ out = *pSrc++; - /* Loop unrolling */ +#if defined (ARM_MATH_LOOPUNROLL) + /* Initialise index of maximum value. */ + index = 0U; + + /* Loop unrolling: Compute 4 outputs at a time */ blkCnt = (blockSize - 1U) >> 2U; while (blkCnt > 0U) { - /* Initialize minVal to the next consecutive values one by one */ - minVal1 = *pSrc++; - minVal2 = *pSrc++; + /* Initialize minVal to next consecutive values one by one */ + minVal = *pSrc++; /* compare for the minimum value */ - if (out > minVal1) + if (out > minVal) { - /* Update the minimum value and its index */ - out = minVal1; - outIndex = count + 1U; + /* Update the minimum value and it's index */ + out = minVal; + outIndex = index + 1U; } - /* compare for the minimum value */ - if (out > minVal2) + minVal = *pSrc++; + if (out > minVal) { - /* Update the minimum value and its index */ - out = minVal2; - outIndex = count + 2U; + out = minVal; + outIndex = index + 2U; } - /* Initialize minVal to the next consecutive values one by one */ - minVal1 = *pSrc++; - minVal2 = *pSrc++; - - /* compare for the minimum value */ - if (out > minVal1) + minVal = *pSrc++; + if (out > minVal) { - /* Update the minimum value and its index */ - out = minVal1; - outIndex = count + 3U; + out = minVal; + outIndex = index + 3U; } - /* compare for the minimum value */ - if (out > minVal2) + minVal = *pSrc++; + if (out > minVal) { - /* Update the minimum value and its index */ - out = minVal2; - outIndex = count + 4U; + out = minVal; + outIndex = index + 4U; } - count += 4U; + index += 4U; - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } - /* if (blockSize - 1U) is not multiple of 4 */ + /* Loop unrolling: Compute remaining outputs */ blkCnt = (blockSize - 1U) % 4U; #else - /* Run the below code for Cortex-M0 */ - - q31_t minVal1, out; /* Temporary variables to store the output value. */ - uint32_t blkCnt, outIndex; /* loop counter */ - - /* Initialise the index value to zero. */ - outIndex = 0U; - /* Load first input value that act as reference value for comparision */ - out = *pSrc++; + /* Initialize blkCnt with number of samples */ blkCnt = (blockSize - 1U); -#endif /* #if defined (ARM_MATH_DSP) */ +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ while (blkCnt > 0U) { /* Initialize minVal to the next consecutive values one by one */ - minVal1 = *pSrc++; + minVal = *pSrc++; /* compare for the minimum value */ - if (out > minVal1) + if (out > minVal) { /* Update the minimum value and it's index */ - out = minVal1; + out = minVal; outIndex = blockSize - blkCnt; } - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } @@ -159,5 +145,5 @@ void arm_min_q31( } /** - * @} end of Min group + @} end of Min group */ |