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Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_euclidean_distance_f16.c

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+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_euclidean_distance_f16.c
+ * Description:  Euclidean 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 Euclidean Euclidean distance
+
+  Euclidean distance
+ */
+
+
+/**
+  @addtogroup Euclidean
+  @{
+ */
+
+
+/**
+ * @brief        Euclidean 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_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+#include "arm_vec_math.h"
+float16_t arm_euclidean_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
+{
+    uint32_t        blkCnt;
+    float16_t       tmp;
+    f16x8_t         a, b, accumV, tempV;
+
+    accumV = vdupq_n_f16(0.0f);
+
+    blkCnt = blockSize >> 3;
+    while (blkCnt > 0U) {
+        a = vld1q(pA);
+        b = vld1q(pB);
+
+        tempV = vsubq(a, b);
+        accumV = vfmaq(accumV, tempV, tempV);
+
+        pA += 8;
+        pB += 8;
+        blkCnt--;
+    }
+
+    /*
+     * tail
+     * (will be merged thru tail predication)
+     */
+    blkCnt = blockSize & 7;
+    if (blkCnt > 0U) {
+        mve_pred16_t    p0 = vctp16q(blkCnt);
+
+        a = vldrhq_z_f16(pA, p0);
+        b = vldrhq_z_f16(pB, p0);
+
+        tempV = vsubq(a, b);
+        accumV = vfmaq_m(accumV, tempV, tempV, p0);
+    }
+
+    arm_sqrt_f16(vecAddAcrossF16Mve(accumV), &tmp);
+    return (tmp);
+}
+
+#else
+float16_t arm_euclidean_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
+{
+   _Float16 accum=0.0f,tmp;
+   float16_t result;
+
+   while(blockSize > 0)
+   {
+      tmp = (_Float16)*pA++ - (_Float16)*pB++;
+      accum += SQ(tmp);
+      blockSize --;
+   }
+   arm_sqrt_f16(accum,&result);
+   return(result);
+}
+
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+
+
+/**
+ * @} end of Euclidean group
+ */
+
+#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ 
+