| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_rms_f16.c |
| * Description: Root mean square value of the elements 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 RMS Root mean square (RMS) |
| |
| Calculates the Root Mean Square of the elements in the input vector. |
| The underlying algorithm is used: |
| |
| <pre> |
| Result = sqrt(((pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + ... + pSrc[blockSize-1] * pSrc[blockSize-1]) / blockSize)); |
| </pre> |
| |
| There are separate functions for floating point, Q31, and Q15 data types. |
| */ |
| |
| /** |
| @addtogroup RMS |
| @{ |
| */ |
| |
| /** |
| @brief Root Mean Square of the elements 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 root mean square value returned here |
| @return none |
| */ |
| |
| #if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) |
| |
| void arm_rms_f16( |
| const float16_t * pSrc, |
| uint32_t blockSize, |
| float16_t * pResult) |
| { |
| float16_t pow = 0.0f; |
| |
| arm_power_f16(pSrc, blockSize, &pow); |
| |
| /* Compute Rms and store the result in the destination */ |
| arm_sqrt_f16((_Float16)pow / (_Float16) blockSize, pResult); |
| } |
| #else |
| |
| void arm_rms_f16( |
| const float16_t * pSrc, |
| uint32_t blockSize, |
| float16_t * pResult) |
| { |
| uint32_t blkCnt; /* Loop counter */ |
| _Float16 sum = 0.0f16; /* Temporary result storage */ |
| _Float16 in; /* Temporary variable to store input value */ |
| |
| #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[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */ |
| |
| in = *pSrc++; |
| /* Compute sum of squares and store result in a temporary variable, sum. */ |
| sum += in * in; |
| |
| in = *pSrc++; |
| sum += in * in; |
| |
| in = *pSrc++; |
| sum += in * in; |
| |
| in = *pSrc++; |
| sum += in * in; |
| |
| /* Decrement 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[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */ |
| |
| in = *pSrc++; |
| /* Compute sum of squares and store result in a temporary variable. */ |
| sum += ( in * in); |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| /* Compute Rms and store result in destination */ |
| arm_sqrt_f16((_Float16)sum / (_Float16) blockSize, pResult); |
| } |
| #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ |
| |
| /** |
| @} end of RMS group |
| */ |
| |
| #endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ |
| |