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Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_chebyshev_distance_f32.c

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+
+/* ----------------------------------------------------------------------
+ * 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
+ */