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Diffstat (limited to 'Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_chebyshev_distance_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_chebyshev_distance_f32.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_chebyshev_distance_f32.c b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_chebyshev_distance_f32.c new file mode 100644 index 0000000..41da72d --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_chebyshev_distance_f32.c @@ -0,0 +1,213 @@ + +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_chebyshev_distance_f32.c + * Description: Chebyshev 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.h" +#include <limits.h> +#include <math.h> + + +/** + @addtogroup Chebyshev + @{ + */ + + +/** + * @brief Chebyshev distance between two vectors + * @param[in] pA First vector + * @param[in] pB Second vector + * @param[in] blockSize vector length + * @return distance + * + */ + +#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" +#include "arm_vec_math.h" + +float32_t arm_chebyshev_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize) +{ + uint32_t blkCnt; /* loop counters */ + f32x4_t vecA, vecB; + f32x4_t vecDiff = vdupq_n_f32(0.0); + float32_t maxValue = 0.0; + + + blkCnt = blockSize >> 2; + while (blkCnt > 0U) { + vecA = vld1q(pA); + pA += 4; + vecB = vld1q(pB); + pB += 4; + /* + * update per-lane max. + */ + vecDiff = vmaxnmaq(vsubq(vecA, vecB), vecDiff); + /* + * Decrement the blockSize loop counter + */ + blkCnt--; + } + /* + * tail + * (will be merged thru tail predication) + */ + blkCnt = blockSize & 3; + if (blkCnt > 0U) { + mve_pred16_t p0 = vctp32q(blkCnt); + + vecA = vldrwq_z_f32(pA, p0); + vecB = vldrwq_z_f32(pB, p0); + + /* + * Get current max per lane and current index per lane + * when a max is selected + */ + vecDiff = vmaxnmaq_m(vecDiff, vsubq(vecA, vecB), p0); + } + /* + * Get max value across the vector + */ + return vmaxnmavq(maxValue, vecDiff); +} + +#else +#if defined(ARM_MATH_NEON) + +#include "NEMath.h" + +float32_t arm_chebyshev_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize) +{ + float32_t diff=0.0f, maxVal=0.0f, tmpA, tmpB; + uint32_t blkCnt; + float32x4_t a,b,diffV, maxValV; + float32x2_t maxValV2; + + if (blockSize <= 3) + { + tmpA = *pA++; + tmpB = *pB++; + diff = fabsf(tmpA - tmpB); + maxVal = diff; + blockSize--; + + while(blockSize > 0) + { + tmpA = *pA++; + tmpB = *pB++; + diff = fabsf(tmpA - tmpB); + if (diff > maxVal) + { + maxVal = diff; + } + blockSize --; + } + } + else + { + + a = vld1q_f32(pA); + b = vld1q_f32(pB); + pA += 4; + pB += 4; + + diffV = vabdq_f32(a,b); + + blockSize -= 4; + + maxValV = diffV; + + + blkCnt = blockSize >> 2; + while(blkCnt > 0) + { + a = vld1q_f32(pA); + b = vld1q_f32(pB); + + diffV = vabdq_f32(a,b); + maxValV = vmaxq_f32(maxValV, diffV); + + pA += 4; + pB += 4; + blkCnt --; + } + maxValV2 = vpmax_f32(vget_low_f32(maxValV),vget_high_f32(maxValV)); + maxValV2 = vpmax_f32(maxValV2,maxValV2); + maxVal = vget_lane_f32(maxValV2,0); + + + blkCnt = blockSize & 3; + while(blkCnt > 0) + { + tmpA = *pA++; + tmpB = *pB++; + diff = fabsf(tmpA - tmpB); + if (diff > maxVal) + { + maxVal = diff; + } + blkCnt --; + } + } + return(maxVal); +} + +#else +float32_t arm_chebyshev_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize) +{ + float32_t diff=0.0f, maxVal,tmpA, tmpB; + + tmpA = *pA++; + tmpB = *pB++; + diff = fabsf(tmpA - tmpB); + maxVal = diff; + blockSize--; + + while(blockSize > 0) + { + tmpA = *pA++; + tmpB = *pB++; + diff = fabsf(tmpA - tmpB); + if (diff > maxVal) + { + maxVal = diff; + } + blockSize --; + } + + return(maxVal); +} +#endif +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + + +/** + * @} end of Chebyshev group + */ |