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Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_mse_f16.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_mse_f16.c
+ * Description:  Half 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_f16.h"
+
+/**
+  @ingroup groupStats
+ */
+
+/**
+  @addtogroup MSE
+  @{
+ */
+
+/**
+  @brief         Mean square error between two half 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
+ */
+
+#if !defined(ARM_MATH_AUTOVECTORIZE)
+
+#if defined(ARM_MATH_MVE_FLOAT16)
+#include "arm_helium_utils.h"
+
+void arm_mse_f16(
+    const float16_t * pSrcA,
+    const float16_t * pSrcB,
+    uint32_t    blockSize,
+    float16_t * result)
+
+{
+    float16x8_t vecA, vecB;
+    float16x8_t vecSum;
+    uint32_t blkCnt; 
+    _Float16 sum = 0.0f16;  
+    vecSum = vdupq_n_f16(0.0f16);
+
+    blkCnt = (blockSize) >> 3;
+    while (blkCnt > 0U)
+    {
+        vecA = vld1q(pSrcA);
+        pSrcA += 8;
+        
+        vecB = vld1q(pSrcB);
+        pSrcB += 8;
+
+        vecA = vsubq(vecA, vecB);
+
+        vecSum = vfmaq(vecSum, vecA, vecA);
+        /*
+         * Decrement the blockSize loop counter
+         */
+        blkCnt --;
+    }
+
+
+    blkCnt = (blockSize) & 7;
+    if (blkCnt > 0U)
+    {
+        mve_pred16_t p0 = vctp16q(blkCnt);
+        vecA = vld1q(pSrcA);
+        vecB = vld1q(pSrcB);
+
+        vecA = vsubq(vecA, vecB);
+        vecSum = vfmaq_m(vecSum, vecA, vecA, p0);
+    }
+
+    sum = vecAddAcrossF16Mve(vecSum);
+
+    /* Store result in destination buffer */
+    *result = (_Float16)sum / (_Float16)blockSize;
+
+}
+
+#endif
+
+
+#endif /*#if !defined(ARM_MATH_AUTOVECTORIZE)*/
+
+
+#if defined(ARM_FLOAT16_SUPPORTED)
+
+#if (!defined(ARM_MATH_MVE_FLOAT16)) || defined(ARM_MATH_AUTOVECTORIZE)
+
+
+
+void arm_mse_f16(
+    const float16_t * pSrcA,
+    const float16_t * pSrcB,
+    uint32_t    blockSize,
+    float16_t * result)
+
+{
+  uint32_t blkCnt;                               /* Loop counter */
+  _Float16 inA, inB;
+  _Float16 sum = 0.0f16;                          /* Temporary return variable */
+#if defined (ARM_MATH_LOOPUNROLL)
+  blkCnt = (blockSize) >> 3;
+
+ 
+  while (blkCnt > 0U)
+  {
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = (blockSize) & 7;
+#else
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+#endif
+  while (blkCnt > 0U)
+  {
+    inA = *pSrcA++; 
+    inB = *pSrcB++;
+    inA = (_Float16)inA - (_Float16)inB;
+    sum += (_Float16)inA * (_Float16)inA;
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Store result in destination buffer */
+  *result = (_Float16)sum / (_Float16)blockSize;
+}
+
+#endif /* end of test for vector instruction availability */
+
+#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
+/**
+  @} end of MSE group
+ */