diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_canberra_distance_f16.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_canberra_distance_f16.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_canberra_distance_f16.c b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_canberra_distance_f16.c new file mode 100644 index 0000000..bcefc91 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_canberra_distance_f16.c @@ -0,0 +1,171 @@ + +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_canberra_distance_f16.c + * Description: Canberra distance between two vectors + * + * $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/distance_functions_f16.h" + +#if defined(ARM_FLOAT16_SUPPORTED) + +#include <limits.h> +#include <math.h> + +/** + @ingroup FloatDist + */ + +/** + @defgroup Canberra Canberra distance + + Canberra distance + */ + + +/** + @addtogroup Canberra + @{ + */ + + +/** + * @brief Canberra distance between two vectors + * + * This function may divide by zero when samples pA[i] and pB[i] are both zero. + * The result of the computation will be correct. So the division per zero may be + * ignored. + * + * @param[in] pA First vector + * @param[in] pB Second vector + * @param[in] blockSize vector length + * @return distance + * + */ + +#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" +#include "arm_vec_math_f16.h" + +float16_t arm_canberra_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize) +{ + _Float16 accum = 0.0f16; + uint32_t blkCnt; + f16x8_t a, b, c, accumV; + + accumV = vdupq_n_f16(0.0f); + + blkCnt = blockSize >> 3; + while (blkCnt > 0) { + a = vld1q(pA); + b = vld1q(pB); + + c = vabdq(a, b); + + a = vabsq(a); + b = vabsq(b); + a = vaddq(a, b); + + /* + * May divide by zero when a and b have both the same lane at zero. + */ + a = vrecip_hiprec_f16(a); + + /* + * Force result of a division by 0 to 0. It the behavior of the + * sklearn canberra function. + */ + a = vdupq_m_n_f16(a, 0.0f, vcmpeqq(a, 0.0f)); + c = vmulq(c, a); + accumV = vaddq(accumV, c); + + pA += 8; + pB += 8; + blkCnt--; + } + + blkCnt = blockSize & 7; + if (blkCnt > 0U) { + mve_pred16_t p0 = vctp16q(blkCnt); + + a = vldrhq_z_f16(pA, p0); + b = vldrhq_z_f16(pB, p0); + + c = vabdq(a, b); + + a = vabsq(a); + b = vabsq(b); + a = vaddq(a, b); + + /* + * May divide by zero when a and b have both the same lane at zero. + */ + a = vrecip_hiprec_f16(a); + + /* + * Force result of a division by 0 to 0. It the behavior of the + * sklearn canberra function. + */ + a = vdupq_m_n_f16(a, 0.0f, vcmpeqq(a, 0.0f)); + c = vmulq(c, a); + accumV = vaddq_m(accumV, accumV, c, p0); + } + + accum = vecAddAcrossF16Mve(accumV); + + return (accum); +} + + +#else +float16_t arm_canberra_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize) +{ + _Float16 accum=0.0f, tmpA, tmpB,diff,sum; + + while(blockSize > 0) + { + tmpA = *pA++; + tmpB = *pB++; + + diff = fabsf((float32_t)((_Float16)tmpA - (_Float16)tmpB)); + sum = (_Float16)fabsf((float32_t)tmpA) + (_Float16)fabsf((float32_t)tmpB); + if (((_Float16)tmpA != 0.0f16) || ((_Float16)tmpB != 0.0f16)) + { + accum += ((_Float16)diff / (_Float16)sum); + } + blockSize --; + } + return(accum); +} +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + + +/** + * @} end of Canberra group + */ + +#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ + |