1 files changed, 140 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_entropy_f16.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_entropy_f16.c
new file mode 100644
index 0000000..9611fd7
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_entropy_f16.c
@@ -0,0 +1,140 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_logsumexp_f16.c
+ * Description:  LogSumExp
+ *
+ * $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/statistics_functions_f16.h"
+
+#if defined(ARM_FLOAT16_SUPPORTED)
+
+#include <limits.h>
+#include <math.h>
+
+/**
+  @ingroup groupStats
+ */
+
+/**
+  @defgroup Entropy Entropy
+
+  Computes the entropy of a distribution
+
+ */
+
+/**
+ * @addtogroup Entropy
+ * @{
+ */
+
+
+/**
+ * @brief Entropy
+ *
+ * @param[in]  pSrcA        Array of input values.
+ * @param[in]  blockSize    Number of samples in the input array.
+ * @return     Entropy      -Sum(p ln p)
+ *
+ */
+
+#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+#include "arm_vec_math_f16.h"
+
+float16_t arm_entropy_f16(const float16_t * pSrcA,uint32_t blockSize)
+{
+    uint32_t        blkCnt;
+    _Float16       accum=0.0f16,p;
+
+
+    blkCnt = blockSize;
+
+    f16x8_t         vSum = vdupq_n_f16(0.0f);
+    /* Compute 4 outputs at a time */
+    blkCnt = blockSize >> 3U;
+
+    while (blkCnt > 0U)
+    {
+        f16x8_t         vecIn = vld1q(pSrcA);
+
+        vSum = vaddq_f16(vSum, vmulq(vecIn, vlogq_f16(vecIn)));
+
+        /*
+         * Decrement the blockSize loop counter
+         * Advance vector source and destination pointers
+         */
+        pSrcA += 8;
+        blkCnt --;
+    }
+
+    accum = vecAddAcrossF16Mve(vSum);
+
+    /* Tail */
+    blkCnt = blockSize & 0x7;
+    while(blkCnt > 0)
+    {
+       p = *pSrcA++;
+       accum += p * (_Float16)logf((float32_t)p);
+       
+       blkCnt--;
+    
+    }
+
+    return (-accum);
+}
+
+#else
+
+float16_t arm_entropy_f16(const float16_t * pSrcA,uint32_t blockSize)
+{
+    const float16_t *pIn;
+    uint32_t blkCnt;
+    _Float16 accum, p;
+ 
+    pIn = pSrcA;
+    blkCnt = blockSize;
+
+    accum = 0.0f;
+
+    while(blkCnt > 0)
+    {
+       p = *pIn++;
+       accum += p * (_Float16)logf((float32_t)p);
+       
+       blkCnt--;
+    
+    }
+
+    return(-accum);
+}
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+
+/**
+ * @} end of Entropy group
+ */
+
+#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ 
+