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| author | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
|---|---|---|
| committer | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
| commit | 5b81bc8ccbd342b8566d88fc9f17a73aec03b5b6 (patch) | |
| tree | cc57486912cfa74c6440d8b97c28f451ec787d78 /Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_f16.c | |
initial commit
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_f16.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_f16.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_f16.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_f16.c new file mode 100644 index 0000000..d296482 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mean_f16.c @@ -0,0 +1,152 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_mean_f16.c + * Description: Mean value of a floating-point 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_f16.h" + +#if defined(ARM_FLOAT16_SUPPORTED) + + +/** + @ingroup groupStats + */ + +/** + @defgroup mean Mean + + Calculates the mean of the input vector. Mean is defined as the average of the elements in the vector. + The underlying algorithm is used: + + <pre> + Result = (pSrc[0] + pSrc[1] + pSrc[2] + ... + pSrc[blockSize-1]) / blockSize; + </pre> + + There are separate functions for floating-point, Q31, Q15, and Q7 data types. + */ + +/** + @addtogroup mean + @{ + */ + +/** + @brief Mean value of a floating-point vector. + @param[in] pSrc points to the input vector. + @param[in] blockSize number of samples in input vector. + @param[out] pResult mean value returned here. + @return none + */ +#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" + +void arm_mean_f16( + const float16_t * pSrc, + uint32_t blockSize, + float16_t * pResult) +{ + int32_t blkCnt; /* loop counters */ + f16x8_t vecSrc; + f16x8_t sumVec = vdupq_n_f16(0.0f16); + + blkCnt = blockSize; + do { + mve_pred16_t p = vctp16q(blkCnt); + + vecSrc = vldrhq_z_f16((float16_t const *) pSrc, p); + sumVec = vaddq_m_f16(sumVec, sumVec, vecSrc, p); + + blkCnt -= 8; + pSrc += 8; + } + while (blkCnt > 0); + + *pResult = (_Float16)vecAddAcrossF16Mve(sumVec) / (_Float16) blockSize; +} + + +#else + +void arm_mean_f16( + const float16_t * pSrc, + uint32_t blockSize, + float16_t * pResult) +{ + uint32_t blkCnt; /* Loop counter */ + float16_t sum = 0.0f; /* Temporary result storage */ + +#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */ + sum += (_Float16)*pSrc++; + + sum += (_Float16)*pSrc++; + + sum += (_Float16)*pSrc++; + + sum += (_Float16)*pSrc++; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = blockSize % 0x4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = blockSize; + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */ + sum += (_Float16)*pSrc++; + + /* Decrement loop counter */ + blkCnt--; + } + + /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize */ + /* Store result to destination */ + *pResult = ((_Float16)sum / (_Float16)blockSize); +} +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + +/** + @} end of mean group + */ + +#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ + |