1 files changed, 157 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cityblock_distance_f32.c b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cityblock_distance_f32.c
new file mode 100644
index 0000000..08d406a
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cityblock_distance_f32.c
@@ -0,0 +1,157 @@
+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cityblock_distance_f32.c
+ * Description:  Cityblock (Manhattan) 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 Manhattan
+  @{
+ */
+
+
+/**
+ * @brief        Cityblock (Manhattan) 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_cityblock_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize)
+{
+    uint32_t        blkCnt;
+    f32x4_t         a, b, accumV, tempV;
+
+    accumV = vdupq_n_f32(0.0f);
+
+    blkCnt = blockSize >> 2;
+    while (blkCnt > 0U) {
+        a = vld1q(pA);
+        b = vld1q(pB);
+
+        tempV = vabdq(a, b);
+        accumV = vaddq(accumV, tempV);
+
+        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);
+
+        tempV = vabdq(a, b);
+        accumV = vaddq_m(accumV, accumV, tempV, p0);
+    }
+
+    return vecAddAcrossF32Mve(accumV);
+}
+
+#else
+#if defined(ARM_MATH_NEON)
+
+#include "NEMath.h"
+
+float32_t arm_cityblock_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize)
+{
+   float32_t accum=0.0f, tmpA, tmpB;
+   uint32_t blkCnt;
+   float32x4_t a,b,accumV, tempV;
+   float32x2_t accumV2;
+
+   accumV = vdupq_n_f32(0.0f);
+
+   blkCnt = blockSize >> 2;
+   while(blkCnt > 0)
+   {
+        a = vld1q_f32(pA);
+        b = vld1q_f32(pB);
+ 
+        tempV = vabdq_f32(a,b);
+        accumV = vaddq_f32(accumV, tempV);
+ 
+        pA += 4;
+        pB += 4;
+        blkCnt --;
+   }
+   accumV2 = vpadd_f32(vget_low_f32(accumV),vget_high_f32(accumV));
+   accumV2 = vpadd_f32(accumV2,accumV2);
+   accum = vget_lane_f32(accumV2,0);
+   
+
+   blkCnt = blockSize & 3;
+   while(blkCnt > 0)
+   {
+      tmpA = *pA++;
+      tmpB = *pB++;
+      accum += fabsf(tmpA - tmpB);
+      
+      blkCnt --;
+   }
+   return(accum);
+}
+
+#else
+float32_t arm_cityblock_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize)
+{
+   float32_t accum,tmpA, tmpB;
+
+   accum = 0.0f;
+   while(blockSize > 0)
+   {
+      tmpA = *pA++;
+      tmpB = *pB++;
+      accum  += fabsf(tmpA - tmpB);
+      
+      blockSize --;
+   }
+  
+   return(accum);
+}
+#endif
+#endif
+
+/**
+ * @} end of Manhattan group
+ */