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- /* ----------------------------------------------------------------------
- * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
- *
- * $Date: 12. March 2014
- * $Revision: V1.4.4
- *
- * Project: CMSIS DSP Library
- * Title: arm_cmplx_dot_prod_f32.c
- *
- * Description: Floating-point complex dot product
- *
- * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * - Neither the name of ARM LIMITED nor the names of its contributors
- * may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- * ---------------------------------------------------------------------------- */
-
- #include "arm_math.h"
-
- /**
- * @ingroup groupCmplxMath
- */
-
- /**
- * @defgroup cmplx_dot_prod Complex Dot Product
- *
- * Computes the dot product of two complex vectors.
- * The vectors are multiplied element-by-element and then summed.
- *
- * The <code>pSrcA</code> points to the first complex input vector and
- * <code>pSrcB</code> points to the second complex input vector.
- * <code>numSamples</code> specifies the number of complex samples
- * and the data in each array is stored in an interleaved fashion
- * (real, imag, real, imag, ...).
- * Each array has a total of <code>2*numSamples</code> values.
- *
- * The underlying algorithm is used:
- * <pre>
- * realResult=0;
- * imagResult=0;
- * for(n=0; n<numSamples; n++) {
- * realResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+0] - pSrcA[(2*n)+1]*pSrcB[(2*n)+1];
- * imagResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+1] + pSrcA[(2*n)+1]*pSrcB[(2*n)+0];
- * }
- * </pre>
- *
- * There are separate functions for floating-point, Q15, and Q31 data types.
- */
-
- /**
- * @addtogroup cmplx_dot_prod
- * @{
- */
-
- /**
- * @brief Floating-point complex dot product
- * @param *pSrcA points to the first input vector
- * @param *pSrcB points to the second input vector
- * @param numSamples number of complex samples in each vector
- * @param *realResult real part of the result returned here
- * @param *imagResult imaginary part of the result returned here
- * @return none.
- */
-
- void arm_cmplx_dot_prod_f32(
- float32_t * pSrcA,
- float32_t * pSrcB,
- uint32_t numSamples,
- float32_t * realResult,
- float32_t * imagResult)
- {
- float32_t real_sum = 0.0f, imag_sum = 0.0f; /* Temporary result storage */
- float32_t a0,b0,c0,d0;
-
- #ifndef ARM_MATH_CM0_FAMILY
-
- /* Run the below code for Cortex-M4 and Cortex-M3 */
- uint32_t blkCnt; /* loop counter */
-
- /*loop Unrolling */
- blkCnt = numSamples >> 2u;
-
- /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
- ** a second loop below computes the remaining 1 to 3 samples. */
- while(blkCnt > 0u)
- {
- a0 = *pSrcA++;
- b0 = *pSrcA++;
- c0 = *pSrcB++;
- d0 = *pSrcB++;
-
- real_sum += a0 * c0;
- imag_sum += a0 * d0;
- real_sum -= b0 * d0;
- imag_sum += b0 * c0;
-
- a0 = *pSrcA++;
- b0 = *pSrcA++;
- c0 = *pSrcB++;
- d0 = *pSrcB++;
-
- real_sum += a0 * c0;
- imag_sum += a0 * d0;
- real_sum -= b0 * d0;
- imag_sum += b0 * c0;
-
- a0 = *pSrcA++;
- b0 = *pSrcA++;
- c0 = *pSrcB++;
- d0 = *pSrcB++;
-
- real_sum += a0 * c0;
- imag_sum += a0 * d0;
- real_sum -= b0 * d0;
- imag_sum += b0 * c0;
-
- a0 = *pSrcA++;
- b0 = *pSrcA++;
- c0 = *pSrcB++;
- d0 = *pSrcB++;
-
- real_sum += a0 * c0;
- imag_sum += a0 * d0;
- real_sum -= b0 * d0;
- imag_sum += b0 * c0;
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
- ** No loop unrolling is used. */
- blkCnt = numSamples & 0x3u;
-
- while(blkCnt > 0u)
- {
- a0 = *pSrcA++;
- b0 = *pSrcA++;
- c0 = *pSrcB++;
- d0 = *pSrcB++;
-
- real_sum += a0 * c0;
- imag_sum += a0 * d0;
- real_sum -= b0 * d0;
- imag_sum += b0 * c0;
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- #else
-
- /* Run the below code for Cortex-M0 */
-
- while(numSamples > 0u)
- {
- a0 = *pSrcA++;
- b0 = *pSrcA++;
- c0 = *pSrcB++;
- d0 = *pSrcB++;
-
- real_sum += a0 * c0;
- imag_sum += a0 * d0;
- real_sum -= b0 * d0;
- imag_sum += b0 * c0;
-
- /* Decrement the loop counter */
- numSamples--;
- }
-
- #endif /* #ifndef ARM_MATH_CM0_FAMILY */
-
- /* Store the real and imaginary results in the destination buffers */
- *realResult = real_sum;
- *imagResult = imag_sum;
- }
-
- /**
- * @} end of cmplx_dot_prod group
- */
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