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Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_mag_q31.c

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+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cmplx_mag_q31.c
+ * Description:  Q31 complex magnitude
+ *
+ * $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/complex_math_functions.h"
+
+/**
+  @ingroup groupCmplxMath
+ */
+
+/**
+  @addtogroup cmplx_mag
+  @{
+ */
+
+/**
+  @brief         Q31 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
+
+  @par           Scaling and Overflow Behavior
+                   The function implements 1.31 by 1.31 multiplications and finally output is converted into 2.30 format.
+                   Input down scaling is not required.
+ */
+
+#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+
+void arm_cmplx_mag_q31(
+  const q31_t * pSrc,
+        q31_t * pDst,
+        uint32_t numSamples)
+{
+    int32_t blockSize = numSamples;  /* loop counters */
+    uint32_t  blkCnt;           /* loop counters */
+
+    q31x4x2_t vecSrc;
+    q31x4_t sum;
+
+    q31_t real, imag;                              /* Temporary input variables */
+    q31_t acc0, acc1;                              /* Accumulators */
+
+    /* Compute 4 complex samples at a time */
+    blkCnt = blockSize >> 2;
+    while (blkCnt > 0U)
+    {
+        vecSrc = vld2q(pSrc);
+
+        sum = vqaddq(vmulhq(vecSrc.val[0], vecSrc.val[0]),
+                     vmulhq(vecSrc.val[1], vecSrc.val[1]));
+
+        sum = vshrq(sum, 1);
+
+        /*
+
+        This function is using a table. There are compilations flags to avoid
+        including this table (and in this case, arm_cmplx_maq_q31 must not
+        be built and linked.)
+
+        */
+        sum = FAST_VSQRT_Q31(sum);
+
+        vst1q(pDst, sum);
+
+        /*
+         * Decrement the blockSize loop counter
+         */
+        blkCnt--;
+        pSrc += 8;
+        pDst += 4;
+    }
+
+    /*
+     * tail
+     */
+    blkCnt = blockSize & 3;
+    while (blkCnt > 0U)
+    {
+      /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
+  
+      real = *pSrc++;
+      imag = *pSrc++;
+      acc0 = (q31_t) (((q63_t) real * real) >> 33);
+      acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
+  
+      /* store result in 2.30 format in destination buffer. */
+      arm_sqrt_q31(acc0 + acc1, pDst++);
+  
+      /* Decrement loop counter */
+      blkCnt--;
+    }
+}
+
+#else
+void arm_cmplx_mag_q31(
+  const q31_t * pSrc,
+        q31_t * pDst,
+        uint32_t numSamples)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+        q31_t real, imag;                              /* Temporary input variables */
+        q31_t acc0, acc1;                              /* Accumulators */
+
+#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++;
+    acc0 = (q31_t) (((q63_t) real * real) >> 33);
+    acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
+
+    /* store result in 2.30 format in destination buffer. */
+    arm_sqrt_q31(acc0 + acc1, pDst++);
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    acc0 = (q31_t) (((q63_t) real * real) >> 33);
+    acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
+    arm_sqrt_q31(acc0 + acc1, pDst++);
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    acc0 = (q31_t) (((q63_t) real * real) >> 33);
+    acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
+    arm_sqrt_q31(acc0 + acc1, pDst++);
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    acc0 = (q31_t) (((q63_t) real * real) >> 33);
+    acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
+    arm_sqrt_q31(acc0 + acc1, 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) */
+
+  while (blkCnt > 0U)
+  {
+    /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
+
+    real = *pSrc++;
+    imag = *pSrc++;
+    acc0 = (q31_t) (((q63_t) real * real) >> 33);
+    acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
+
+    /* store result in 2.30 format in destination buffer. */
+    arm_sqrt_q31(acc0 + acc1, pDst++);
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+#endif /* defined(ARM_MATH_MVEI) */
+
+/**
+  @} end of cmplx_mag group
+ */