From 5b81bc8ccbd342b8566d88fc9f17a73aec03b5b6 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Wed, 29 Jan 2025 21:34:25 -0500
Subject: initial commit

---
 .../Source/DistanceFunctions/arm_dice_distance.c   | 92 ++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_dice_distance.c

(limited to 'Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_dice_distance.c')

diff --git a/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_dice_distance.c b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_dice_distance.c
new file mode 100644
index 0000000..cae963a
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_dice_distance.c
@@ -0,0 +1,92 @@
+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_dice_distance.c
+ * Description:  Dice 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>
+
+extern void arm_boolean_distance_TT_TF_FT(const uint32_t *pA
+       , const uint32_t *pB
+       , uint32_t numberOfBools
+       , uint32_t *cTT
+       , uint32_t *cTF
+       , uint32_t *cFT
+       );
+
+
+/**
+ * @ingroup groupDistance
+ * @{
+ */
+
+/**
+ * @defgroup BoolDist Boolean Distances
+ *
+ * Distances between two vectors of boolean values.
+ *
+ * Booleans are packed in 32 bit words.
+ * numberOfBooleans argument is the number of booleans and not the
+ * number of words.
+ *
+ * Bits are packed in big-endian mode (because of behavior of numpy packbits in
+ * in version < 1.17)
+ */
+
+/**
+  @addtogroup BoolDist
+  @{
+ */
+
+/**
+ * @brief        Dice distance between two vectors
+ *
+ * @param[in]    pA              First vector of packed booleans
+ * @param[in]    pB              Second vector of packed booleans
+ * @param[in]    numberOfBools   Number of booleans
+ * @return distance
+ *
+ */
+
+float32_t arm_dice_distance(const uint32_t *pA, const uint32_t *pB, uint32_t numberOfBools)
+{
+    uint32_t ctt=0,ctf=0,cft=0;
+
+    arm_boolean_distance_TT_TF_FT(pA, pB, numberOfBools, &ctt, &ctf, &cft);
+
+    return(1.0*(ctf + cft) / (2.0*ctt + cft + ctf));
+}
+
+
+/**
+ * @} end of BoolDist group
+ */
+
+/**
+ * @} end of groupDistance group
+ */
-- 
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