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Diffstat (limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c new file mode 100644 index 0000000..5715e37 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_q15.c @@ -0,0 +1,201 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_max_q15.c + * Description: Maximum value of a Q15 vector + * + * $Date: 23 April 2021 + * $Revision: V1.9.0 + * + * Target Processor: Cortex-M and Cortex-A cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved. + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "dsp/statistics_functions.h" + +/** + @ingroup groupStats + */ + +/** + @addtogroup Max + @{ + */ + +/** + @brief Maximum value of a Q15 vector. + @param[in] pSrc points to the input vector + @param[in] blockSize number of samples in input vector + @param[out] pResult maximum value returned here + @param[out] pIndex index of maximum value returned here + @return none + */ +#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" + +void arm_max_q15( + const q15_t * pSrc, + uint32_t blockSize, + q15_t * pResult, + uint32_t * pIndex) +{ + int32_t blkCnt; /* loop counters */ + q15x8_t extremValVec = vdupq_n_s16(Q15_MIN); + q15_t maxValue = Q15_MIN; + uint16x8_t indexVec; + uint16x8_t extremIdxVec; + mve_pred16_t p0; + uint16_t extremIdxArr[8]; + + indexVec = vidupq_u16(0U, 1); + + blkCnt = blockSize; + do { + mve_pred16_t p = vctp16q(blkCnt); + q15x8_t extremIdxVal = vld1q_z_s16(pSrc, p); + /* + * Get current max per lane and current index per lane + * when a max is selected + */ + p0 = vcmpgeq_m(extremIdxVal, extremValVec, p); + + extremValVec = vorrq_m(extremValVec, extremIdxVal, extremIdxVal, p0); + /* store per-lane extrema indexes */ + vst1q_p_u16(extremIdxArr, indexVec, p0); + + indexVec += 8; + pSrc += 8; + blkCnt -= 8; + } + while (blkCnt > 0); + + + /* Get max value across the vector */ + maxValue = vmaxvq(maxValue, extremValVec); + + /* set index for lower values to max possible index */ + p0 = vcmpgeq(extremValVec, maxValue); + extremIdxVec = vld1q_u16(extremIdxArr); + + indexVec = vpselq(extremIdxVec, vdupq_n_u16(blockSize - 1), p0); + *pIndex = vminvq(blockSize - 1, indexVec); + *pResult = maxValue; +} + +#else +void arm_max_q15( + const q15_t * pSrc, + uint32_t blockSize, + q15_t * pResult, + uint32_t * pIndex) +{ + q15_t maxVal, out; /* Temporary variables to store the output value. */ + uint32_t blkCnt, outIndex; /* Loop counter */ + +#if defined (ARM_MATH_LOOPUNROLL) + uint32_t index; /* index of maximum value */ +#endif + + /* Initialise index value to zero. */ + outIndex = 0U; + /* Load first input value that act as reference value for comparision */ + out = *pSrc++; + +#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 maxVal to next consecutive values one by one */ + maxVal = *pSrc++; + + /* compare for the maximum value */ + if (out < maxVal) + { + /* Update the maximum value and it's index */ + out = maxVal; + outIndex = index + 1U; + } + + maxVal = *pSrc++; + if (out < maxVal) + { + out = maxVal; + outIndex = index + 2U; + } + + maxVal = *pSrc++; + if (out < maxVal) + { + out = maxVal; + outIndex = index + 3U; + } + + maxVal = *pSrc++; + if (out < maxVal) + { + out = maxVal; + outIndex = index + 4U; + } + + index += 4U; + + /* Decrement loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = (blockSize - 1U) % 4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = (blockSize - 1U); + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* Initialize maxVal to the next consecutive values one by one */ + maxVal = *pSrc++; + + /* compare for the maximum value */ + if (out < maxVal) + { + /* Update the maximum value and it's index */ + out = maxVal; + outIndex = blockSize - blkCnt; + } + + /* Decrement loop counter */ + blkCnt--; + } + + /* Store the maximum value and it's index into destination pointers */ + *pResult = out; + *pIndex = outIndex; +} +#endif /* defined(ARM_MATH_MVEI) */ +/** + @} end of Max group + */ |