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Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_f16.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_abs_f16.c
+ * Description:  Floating-point vector absolute value
+ *
+ * $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/basic_math_functions_f16.h"
+#include <math.h>
+
+/**
+  @ingroup groupMath
+ */
+
+/**
+  @defgroup BasicAbs Vector Absolute Value
+
+  Computes the absolute value of a vector on an element-by-element basis.
+
+  <pre>
+      pDst[n] = abs(pSrc[n]),   0 <= n < blockSize.
+  </pre>
+
+  The functions support in-place computation allowing the source and
+  destination pointers to reference the same memory buffer.
+  There are separate functions for floating-point, Q7, Q15, and Q31 data types.
+ */
+
+/**
+  @addtogroup BasicAbs
+  @{
+ */
+
+/**
+  @brief         Floating-point vector absolute value.
+  @param[in]     pSrc       points to the input vector
+  @param[out]    pDst       points to the output vector
+  @param[in]     blockSize  number of samples in each vector
+  @return        none
+ */
+
+
+#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+
+void arm_abs_f16(
+  const float16_t * pSrc,
+        float16_t * pDst,
+        uint32_t blockSize)
+{
+    uint32_t blkCnt;                               /* Loop counter */
+    f16x8_t vec1;
+    f16x8_t res;
+
+
+    /* Compute 4 outputs at a time */
+    blkCnt = blockSize >> 3U;
+
+    while (blkCnt > 0U)
+    {
+        /* C = |A| */
+
+        /* Calculate absolute values and then store the results in the destination buffer. */
+        vec1 = vld1q(pSrc);
+        res = vabsq(vec1);
+        vst1q(pDst, res);
+
+        /* Increment pointers */
+        pSrc += 8;
+        pDst += 8;
+        
+        /* Decrement the loop counter */
+        blkCnt--;
+    }
+
+    /* Tail */
+    blkCnt = blockSize & 0x7;
+
+
+    if (blkCnt > 0U)
+    {
+      /* C = |A| */
+      mve_pred16_t p0 = vctp16q(blkCnt);
+      vec1 = vld1q(pSrc);
+      vstrhq_p(pDst, vabsq(vec1), p0);
+    }
+
+}
+
+#else
+#if defined(ARM_FLOAT16_SUPPORTED)
+void arm_abs_f16(
+  const float16_t * pSrc,
+        float16_t * pDst,
+        uint32_t blockSize)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+
+#if defined(ARM_MATH_NEON_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
+    f16x8_t vec1;
+    f16x8_t res;
+
+    /* Compute 4 outputs at a time */
+    blkCnt = blockSize >> 2U;
+
+    while (blkCnt > 0U)
+    {
+        /* C = |A| */
+
+    	/* Calculate absolute values and then store the results in the destination buffer. */
+        vec1 = vld1q_f16(pSrc);
+        res = vabsq_f16(vec1);
+        vst1q_f16(pDst, res);
+
+        /* Increment pointers */
+        pSrc += 4;
+        pDst += 4;
+        
+        /* Decrement the loop counter */
+        blkCnt--;
+    }
+
+    /* Tail */
+    blkCnt = blockSize & 0x3;
+
+#else
+#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C = |A| */
+
+    /* Calculate absolute and store result in destination buffer. */
+    *pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
+
+    *pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
+
+    *pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
+
+    *pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
+
+    /* 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) */
+#endif /* #if defined(ARM_MATH_NEON) */
+
+  while (blkCnt > 0U)
+  {
+    /* C = |A| */
+
+    /* Calculate absolute and store result in destination buffer. */
+    *pDst++ = (_Float16)fabsf((float32_t)*pSrc++);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+#endif /* defined(ARM_FLOAT16_SUPPORTED */
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+/**
+  @} end of BasicAbs group
+ */