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Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_minkowski_distance_f32.c

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+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_minkowski_distance_f32.c
+ * Description:  Minkowski 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 Minkowski
+  @{
+ */
+
+/* 6.14 bug */
+#if defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6100100) && (__ARMCC_VERSION < 6150001)
+ 
+__attribute__((weak)) float __powisf2(float a, int b)
+{ 
+    const int recip = b < 0;
+    float r = 1;
+    while (1)
+    {
+        if (b & 1)
+            r *= a;
+        b /= 2;
+        if (b == 0)
+            break;
+        a *= a;
+    }
+    return recip ? 1/r : r;
+}
+#endif 
+
+/**
+ * @brief        Minkowski distance between two vectors
+ *
+ * @param[in]    pA         First vector
+ * @param[in]    pB         Second vector
+ * @param[in]    order      Distance order
+ * @param[in]    blockSize  Number of samples
+ * @return distance
+ *
+ */
+
+#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+#include "arm_vec_math.h"
+
+float32_t arm_minkowski_distance_f32(const float32_t *pA,const float32_t *pB, int32_t order, uint32_t blockSize)
+{
+    uint32_t        blkCnt;
+    f32x4_t         a, b, tmpV, sumV;
+
+    sumV = vdupq_n_f32(0.0f);
+
+    blkCnt = blockSize >> 2;
+    while (blkCnt > 0U) {
+        a = vld1q(pA);
+        b = vld1q(pB);
+
+        tmpV = vabdq(a, b);
+        tmpV = vpowq_f32(tmpV, vdupq_n_f32(order));
+        sumV = vaddq(sumV, tmpV);
+
+        pA += 4;
+        pB += 4;
+        blkCnt--;
+    }
+
+    /*
+     * tail
+     * (will be merged thru tail predication)
+     */
+    blkCnt = blockSize & 3;
+    if (blkCnt > 0U) {
+        mve_pred16_t    p0 = vctp32q(blkCnt);
+
+        a = vldrwq_z_f32(pA, p0);
+        b = vldrwq_z_f32(pB, p0);
+
+        tmpV = vabdq(a, b);
+        tmpV = vpowq_f32(tmpV, vdupq_n_f32(order));
+        sumV = vaddq_m(sumV, sumV, tmpV, p0);
+    }
+
+    return (powf(vecAddAcrossF32Mve(sumV), (1.0f / (float32_t) order)));
+}
+
+#else
+#if defined(ARM_MATH_NEON)
+
+#include "NEMath.h"
+
+float32_t arm_minkowski_distance_f32(const float32_t *pA,const float32_t *pB, int32_t order, uint32_t blockSize)
+{
+    float32_t sum;
+    uint32_t blkCnt;
+    float32x4_t sumV,aV,bV, tmpV, n;
+    float32x2_t sumV2;
+
+    sum = 0.0f; 
+    sumV = vdupq_n_f32(0.0f);
+    n = vdupq_n_f32(order);
+
+    blkCnt = blockSize >> 2;
+    while(blkCnt > 0)
+    {
+       aV = vld1q_f32(pA);
+       bV = vld1q_f32(pB);
+       pA += 4;
+       pB += 4;
+
+       tmpV = vabdq_f32(aV,bV);
+       tmpV = vpowq_f32(tmpV,n);
+       sumV = vaddq_f32(sumV, tmpV);
+
+
+       blkCnt --;
+    }
+
+    sumV2 = vpadd_f32(vget_low_f32(sumV),vget_high_f32(sumV));
+    sum = vget_lane_f32(sumV2, 0) + vget_lane_f32(sumV2, 1);
+
+    blkCnt = blockSize & 3;
+    while(blkCnt > 0)
+    {
+       sum += powf(fabsf(*pA++ - *pB++),order);
+
+       blkCnt --;
+    }
+
+
+    return(powf(sum,(1.0f/order)));
+
+}
+
+#else
+
+
+float32_t arm_minkowski_distance_f32(const float32_t *pA,const float32_t *pB, int32_t order, uint32_t blockSize)
+{
+    float32_t sum;
+    uint32_t i;
+
+    sum = 0.0f; 
+    for(i=0; i < blockSize; i++)
+    {
+       sum += powf(fabsf(pA[i] - pB[i]),order);
+    }
+
+
+    return(powf(sum,(1.0f/order)));
+
+}
+#endif
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+
+
+/**
+ * @} end of Minkowski group
+ */