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Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_entropy_f32.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_logsumexp_f32.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.h"
+#include <limits.h>
+#include <math.h>
+
+
+/**
+ * @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_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+#include "arm_vec_math.h"
+
+float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
+{
+    uint32_t        blkCnt;
+    float32_t       accum=0.0f,p;
+
+
+    blkCnt = blockSize;
+
+    f32x4_t         vSum = vdupq_n_f32(0.0f);
+    /* Compute 4 outputs at a time */
+    blkCnt = blockSize >> 2U;
+
+    while (blkCnt > 0U)
+    {
+        f32x4_t         vecIn = vld1q(pSrcA);
+
+        vSum = vaddq_f32(vSum, vmulq(vecIn, vlogq_f32(vecIn)));
+
+        /*
+         * Decrement the blockSize loop counter
+         * Advance vector source and destination pointers
+         */
+        pSrcA += 4;
+        blkCnt --;
+    }
+
+    accum = vecAddAcrossF32Mve(vSum);
+
+    /* Tail */
+    blkCnt = blockSize & 0x3;
+    while(blkCnt > 0)
+    {
+       p = *pSrcA++;
+       accum += p * logf(p);
+       
+       blkCnt--;
+    
+    }
+
+    return (-accum);
+}
+
+#else
+#if defined(ARM_MATH_NEON) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "NEMath.h"
+
+float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
+{
+    const float32_t *pIn;
+    uint32_t blkCnt;
+    float32_t accum, p;
+
+    float32x4_t accumV;
+    float32x2_t accumV2;
+    float32x4_t tmpV, tmpV2;
+ 
+    pIn = pSrcA;
+
+    accum = 0.0f;
+    accumV = vdupq_n_f32(0.0f);
+
+    blkCnt = blockSize >> 2;
+    while(blkCnt > 0)
+    {
+      tmpV = vld1q_f32(pIn);
+      pIn += 4;
+
+      tmpV2 = vlogq_f32(tmpV);
+      accumV = vmlaq_f32(accumV, tmpV, tmpV2);
+       
+      blkCnt--;
+    
+    }
+
+    accumV2 = vpadd_f32(vget_low_f32(accumV),vget_high_f32(accumV));
+    accum = vget_lane_f32(accumV2, 0) + vget_lane_f32(accumV2, 1);
+    
+
+    blkCnt = blockSize & 3;
+    while(blkCnt > 0)
+    {
+       p = *pIn++;
+       accum += p * logf(p);
+       
+       blkCnt--;
+    
+    }
+
+    return(-accum);
+}
+
+#else
+float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
+{
+    const float32_t *pIn;
+    uint32_t blkCnt;
+    float32_t accum, p;
+ 
+    pIn = pSrcA;
+    blkCnt = blockSize;
+
+    accum = 0.0f;
+
+    while(blkCnt > 0)
+    {
+       p = *pIn++;
+       accum += p * logf(p);
+       
+       blkCnt--;
+    
+    }
+
+    return(-accum);
+}
+#endif
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+
+/**
+ * @} end of Entropy group
+ */