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Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mse_q15.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_mse_q15.c
+ * Description:  Mean square error between two Q15 vectors
+ *
+ * $Date:        04 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 Q15 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]    pResult     mean square error
+  @return        none
+ */
+#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
+void arm_mse_q15(
+  const q15_t * pSrcA,
+  const q15_t * pSrcB,
+        uint32_t blockSize,
+        q15_t * pResult)
+{
+    uint32_t  blkCnt;           /* loop counters */
+    q15x8_t vecSrcA,vecSrcB;
+    q63_t   sum = 0LL;
+
+    blkCnt = blockSize >> 3U;
+    while (blkCnt > 0U)
+    {
+        vecSrcA = vld1q(pSrcA);
+        vecSrcB = vld1q(pSrcB);
+
+        vecSrcA = vshrq(vecSrcA,1);
+        vecSrcB = vshrq(vecSrcB,1);
+
+        vecSrcA = vqsubq(vecSrcA,vecSrcB);
+        /*
+         * sum lanes
+         */
+        sum = vmlaldavaq(sum, vecSrcA, vecSrcA);
+
+        blkCnt--;
+        pSrcA += 8;
+        pSrcB += 8;
+    }
+
+    /*
+     * tail
+     */
+    blkCnt = blockSize & 7;
+    if (blkCnt > 0U)
+    {
+        mve_pred16_t p0 = vctp16q(blkCnt);
+        vecSrcA = vld1q(pSrcA);
+        vecSrcB = vld1q(pSrcB);
+
+        vecSrcA = vshrq(vecSrcA,1);
+        vecSrcB = vshrq(vecSrcB,1);
+
+        vecSrcA = vqsubq(vecSrcA,vecSrcB);
+
+        sum = vmlaldavaq_p(sum, vecSrcA, vecSrcA, p0);
+    }
+
+    
+
+    *pResult = (q15_t) __SSAT((q31_t) (sum / blockSize)>>13, 16);
+}
+#else
+void arm_mse_q15(
+  const q15_t * pSrcA,
+  const q15_t * pSrcB,
+        uint32_t blockSize,
+        q15_t * pResult)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+        q63_t sum = 0;                                 /* Temporary result storage */
+        q15_t inA,inB;                                       /* Temporary variable to store input value */
+
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  while (blkCnt > 0U)
+  {
+
+    inA = *pSrcA++ >> 1;
+    inB = *pSrcB++ >> 1;
+    inA = (q15_t) __SSAT(((q31_t) inA - (q31_t)inB), 16);
+    sum += (q63_t)((q31_t) inA * inA);
+
+    inA = *pSrcA++ >> 1;
+    inB = *pSrcB++ >> 1;
+    inA = (q15_t) __SSAT(((q31_t) inA - (q31_t)inB), 16);
+    sum += (q63_t)((q31_t) inA * inA);
+
+    inA = *pSrcA++ >> 1;
+    inB = *pSrcB++ >> 1;
+    inA = (q15_t) __SSAT(((q31_t) inA - (q31_t)inB), 16);
+    sum += (q63_t)((q31_t) inA * inA);
+
+    inA = *pSrcA++ >> 1;
+    inB = *pSrcB++ >> 1;
+    inA = (q15_t) __SSAT(((q31_t) inA - (q31_t)inB), 16);
+    sum += (q63_t)((q31_t) inA * inA);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = blockSize % 0x4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+  while (blkCnt > 0U)
+  {
+
+    inA = *pSrcA++ >> 1;
+    inB = *pSrcB++ >> 1;
+    inA = (q15_t) __SSAT(((q31_t) inA - (q31_t)inB), 16);
+    sum += (q63_t)((q31_t) inA * inA);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Store result in q15 format */
+  *pResult = (q15_t) __SSAT((q31_t) (sum / blockSize)>>13, 16);
+}
+#endif /* defined(ARM_MATH_MVEI) */
+
+/**
+  @} end of MSE group
+ */