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Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mse_f64.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_mse_f64.c
+ * Description:  Double floating point mean square error
+ *
+ * $Date:        05 April 2022
+ * $Revision:    V1.10.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2022 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"
+
+/**
+  @ingroup groupStats
+ */
+
+/**
+  @addtogroup MSE
+  @{
+ */
+
+/**
+  @brief         Mean square error between two double floating point vectors.
+  @param[in]     pSrcA       points to the first input vector
+  @param[in]     pSrcB       points to the second input vector
+  @param[in]     blockSize   number of samples in input vector
+  @param[out]    result      mean square error
+  @return        none
+ */
+
+
+
+
+
+void arm_mse_f64(
+    const float64_t * pSrcA,
+    const float64_t * pSrcB,
+    uint32_t    blockSize,
+    float64_t * result)
+
+{
+  uint32_t blkCnt;                               /* Loop counter */
+  float64_t inA, inB;
+  float64_t sum = 0.0;                          /* Temporary return variable */
+#if defined (ARM_MATH_LOOPUNROLL)
+  blkCnt = (blockSize) >> 1;
+
+ 
+  while (blkCnt > 0U)
+  {
+
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = inA - inB;
+    sum += inA * inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = inA - inB;
+    sum += inA * inA;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = (blockSize) & 1;
+#else
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+#endif
+  while (blkCnt > 0U)
+  {
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = inA - inB;
+    sum += inA * inA;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Store result in destination buffer */
+  *result = sum / blockSize;
+}
+
+
+/**
+  @} end of MSE group
+ */