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Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_mag_f32.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cmplx_mag_f32.c
+ * Description:  Floating-point complex magnitude
+ *
+ * $Date:        18. March 2019
+ * $Revision:    V1.6.0
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2019 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 "arm_math.h"
+
+/**
+  @ingroup groupCmplxMath
+ */
+
+/**
+  @defgroup cmplx_mag Complex Magnitude
+
+  Computes the magnitude of the elements of a complex data vector.
+
+  The <code>pSrc</code> points to the source data and
+  <code>pDst</code> points to the where the result should be written.
+  <code>numSamples</code> specifies the number of complex samples
+  in the input array and the data is stored in an interleaved fashion
+  (real, imag, real, imag, ...).
+  The input array has a total of <code>2*numSamples</code> values;
+  the output array has a total of <code>numSamples</code> values.
+
+  The underlying algorithm is used:
+
+  <pre>
+  for (n = 0; n < numSamples; n++) {
+      pDst[n] = sqrt(pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2);
+  }
+  </pre>
+
+  There are separate functions for floating-point, Q15, and Q31 data types.
+ */
+
+/**
+  @addtogroup cmplx_mag
+  @{
+ */
+
+/**
+  @brief         Floating-point complex magnitude.
+  @param[in]     pSrc        points to input vector
+  @param[out]    pDst        points to output vector
+  @param[in]     numSamples  number of samples in each vector
+  @return        none
+ */
+
+void arm_cmplx_mag_f32(
+  const float32_t * pSrc,
+        float32_t * pDst,
+        uint32_t numSamples)
+{
+  uint32_t blkCnt;                               /* loop counter */
+  float32_t real, imag;                      /* Temporary variables to hold input values */
+
+#if defined(ARM_MATH_NEON)
+
+  float32x4x2_t vecA;
+  float32x4_t vRealA;
+  float32x4_t vImagA;
+  float32x4_t vMagSqA;
+
+  float32x4x2_t vecB;
+  float32x4_t vRealB;
+  float32x4_t vImagB;
+  float32x4_t vMagSqB;
+
+  /* Loop unrolling: Compute 8 outputs at a time */
+  blkCnt = numSamples >> 3;
+
+  while (blkCnt > 0U)
+  {
+    /* out = sqrt((real * real) + (imag * imag)) */
+
+    vecA = vld2q_f32(pSrc);
+    pSrc += 8;
+
+    vecB = vld2q_f32(pSrc);
+    pSrc += 8;
+
+    vRealA = vmulq_f32(vecA.val[0], vecA.val[0]);
+    vImagA = vmulq_f32(vecA.val[1], vecA.val[1]);
+    vMagSqA = vaddq_f32(vRealA, vImagA);
+
+    vRealB = vmulq_f32(vecB.val[0], vecB.val[0]);
+    vImagB = vmulq_f32(vecB.val[1], vecB.val[1]);
+    vMagSqB = vaddq_f32(vRealB, vImagB);
+
+    /* Store the result in the destination buffer. */
+    vst1q_f32(pDst, __arm_vec_sqrt_f32_neon(vMagSqA));
+    pDst += 4;
+
+    vst1q_f32(pDst, __arm_vec_sqrt_f32_neon(vMagSqB));
+    pDst += 4;
+
+    /* Decrement the loop counter */
+    blkCnt--;
+  }
+
+  blkCnt = numSamples & 7;
+
+#else
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = numSamples >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
+
+    real = *pSrc++;
+    imag = *pSrc++;
+
+    /* store result in destination buffer. */
+    arm_sqrt_f32((real * real) + (imag * imag), pDst++);
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    arm_sqrt_f32((real * real) + (imag * imag), pDst++);
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    arm_sqrt_f32((real * real) + (imag * imag), pDst++);
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    arm_sqrt_f32((real * real) + (imag * imag), pDst++);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = numSamples % 0x4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = numSamples;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+#endif /* #if defined(ARM_MATH_NEON) */
+
+  while (blkCnt > 0U)
+  {
+    /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
+
+    real = *pSrc++;
+    imag = *pSrc++;
+
+    /* store result in destination buffer. */
+    arm_sqrt_f32((real * real) + (imag * imag), pDst++);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+
+/**
+  @} end of cmplx_mag group
+ */