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/* ----------------------------------------------------------------------    
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* Copyright (C) 2010-2014 ARM Limited. All rights reserved.    
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*    
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* $Date:        19. March 2015
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* $Revision:    V.1.4.5
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*    
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* Project:          CMSIS DSP Library    
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* Title:            arm_cmplx_mult_cmplx_q15.c    
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*    
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* Description:  Q15 complex-by-complex multiplication    
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*    
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*  
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*   - Redistributions of source code must retain the above copyright
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*     notice, this list of conditions and the following disclaimer.
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*   - Redistributions in binary form must reproduce the above copyright
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*     notice, this list of conditions and the following disclaimer in
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*     the documentation and/or other materials provided with the
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*     distribution.
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*   - Neither the name of ARM LIMITED nor the names of its contributors
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*     may be used to endorse or promote products derived from this
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*     software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.  
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* -------------------------------------------------------------------- */
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#include "arm_math.h"
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/**    
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 * @ingroup groupCmplxMath    
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 */
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/**    
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 * @addtogroup CmplxByCmplxMult    
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 * @{    
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 */
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/**    
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 * @brief  Q15 complex-by-complex multiplication    
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 * @param[in]  *pSrcA points to the first input vector    
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 * @param[in]  *pSrcB points to the second input vector    
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 * @param[out]  *pDst  points to the output vector    
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 * @param[in]  numSamples number of complex samples in each vector    
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 * @return none.    
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 *    
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 * <b>Scaling and Overflow Behavior:</b>    
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 * \par    
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 * The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format.    
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 */
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void arm_cmplx_mult_cmplx_q15(
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  q15_t * pSrcA,
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  q15_t * pSrcB,
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  q15_t * pDst,
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  uint32_t numSamples)
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{
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  q15_t a, b, c, d;                              /* Temporary variables to store real and imaginary values */
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#ifndef ARM_MATH_CM0_FAMILY
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  /* Run the below code for Cortex-M4 and Cortex-M3 */
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  uint32_t blkCnt;                               /* loop counters */
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  /* loop Unrolling */
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  blkCnt = numSamples >> 2u;
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  /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.    
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   ** a second loop below computes the remaining 1 to 3 samples. */
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  while(blkCnt > 0u)
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  {
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    /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
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    /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
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    a = *pSrcA++;
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    b = *pSrcA++;
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    c = *pSrcB++;
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    d = *pSrcB++;
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
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    a = *pSrcA++;
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    b = *pSrcA++;
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    c = *pSrcB++;
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    d = *pSrcB++;
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
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    a = *pSrcA++;
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    b = *pSrcA++;
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    c = *pSrcB++;
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    d = *pSrcB++;
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
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    a = *pSrcA++;
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    b = *pSrcA++;
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    c = *pSrcB++;
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    d = *pSrcB++;
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
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    /* Decrement the blockSize loop counter */
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    blkCnt--;
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  }
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  /* If the blockSize is not a multiple of 4, compute any remaining output samples here.    
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   ** No loop unrolling is used. */
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  blkCnt = numSamples % 0x4u;
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  while(blkCnt > 0u)
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  {
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    /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
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    /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
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    a = *pSrcA++;
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    b = *pSrcA++;
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    c = *pSrcB++;
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    d = *pSrcB++;
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
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    /* Decrement the blockSize loop counter */
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    blkCnt--;
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  }
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#else
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  /* Run the below code for Cortex-M0 */
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  while(numSamples > 0u)
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  {
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    /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
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    /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
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    a = *pSrcA++;
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    b = *pSrcA++;
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    c = *pSrcB++;
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    d = *pSrcB++;
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
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    /* store the result in 3.13 format in the destination buffer. */
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    *pDst++ =
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      (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
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    /* Decrement the blockSize loop counter */
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    numSamples--;
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  }
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#endif /* #ifndef ARM_MATH_CM0_FAMILY */
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}
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/**    
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 * @} end of CmplxByCmplxMult group    
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 */