DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q31.c - third_party/github/STMicroelectronics/cmsis_core - Git at Google

 /* ----------------------------------------------------------------------
 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
 *
 * $Date:        19. March 2015
 * $Revision: 	V.1.4.5
 *
 * Project: 	    CMSIS DSP Library
 * Title:	    arm_cmplx_mult_real_q31.c
 *
 * Description:	Q31 complex by real multiplication
 *
 * 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
  */

 /**
  * @addtogroup CmplxByRealMult
  * @{
  */


 /**
  * @brief  Q31 complex-by-real multiplication
  * @param[in]  *pSrcCmplx points to the complex input vector
  * @param[in]  *pSrcReal points to the real input vector
  * @param[out]  *pCmplxDst points to the complex output vector
  * @param[in]  numSamples number of samples in each vector
  * @return none.
  *
  * <b>Scaling and Overflow Behavior:</b>
  * \par
  * The function uses saturating arithmetic.
  * Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.
  */

 void arm_cmplx_mult_real_q31(
   q31_t * pSrcCmplx,
   q31_t * pSrcReal,
   q31_t * pCmplxDst,
   uint32_t numSamples)
 {
   q31_t inA1;                                    /* Temporary variable to store input value */

 #ifndef ARM_MATH_CM0_FAMILY

   /* Run the below code for Cortex-M4 and Cortex-M3 */
   uint32_t blkCnt;                               /* loop counters */
   q31_t inA2, inA3, inA4;                        /* Temporary variables to hold input data */
   q31_t inB1, inB2;                              /* Temporary variabels to hold input data */
   q31_t out1, out2, out3, out4;                  /* Temporary variables to hold output data */

   /* 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)
   {
     /* C[2 * i] = A[2 * i] * B[i].            */
     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
     /* read real input from complex input buffer */
     inA1 = *pSrcCmplx++;
     inA2 = *pSrcCmplx++;
     /* read input from real input bufer */
     inB1 = *pSrcReal++;
     inB2 = *pSrcReal++;
     /* read imaginary input from complex input buffer */
     inA3 = *pSrcCmplx++;
     inA4 = *pSrcCmplx++;

     /* multiply complex input with real input */
     out1 = ((q63_t) inA1 * inB1) >> 32;
     out2 = ((q63_t) inA2 * inB1) >> 32;
     out3 = ((q63_t) inA3 * inB2) >> 32;
     out4 = ((q63_t) inA4 * inB2) >> 32;

     /* sature the result */
     out1 = __SSAT(out1, 31);
     out2 = __SSAT(out2, 31);
     out3 = __SSAT(out3, 31);
     out4 = __SSAT(out4, 31);

     /* get result in 1.31 format */
     out1 = out1 << 1;
     out2 = out2 << 1;
     out3 = out3 << 1;
     out4 = out4 << 1;

     /* store the result to destination buffer */
     *pCmplxDst++ = out1;
     *pCmplxDst++ = out2;
     *pCmplxDst++ = out3;
     *pCmplxDst++ = out4;

     /* read real input from complex input buffer */
     inA1 = *pSrcCmplx++;
     inA2 = *pSrcCmplx++;
     /* read input from real input bufer */
     inB1 = *pSrcReal++;
     inB2 = *pSrcReal++;
     /* read imaginary input from complex input buffer */
     inA3 = *pSrcCmplx++;
     inA4 = *pSrcCmplx++;

     /* multiply complex input with real input */
     out1 = ((q63_t) inA1 * inB1) >> 32;
     out2 = ((q63_t) inA2 * inB1) >> 32;
     out3 = ((q63_t) inA3 * inB2) >> 32;
     out4 = ((q63_t) inA4 * inB2) >> 32;

     /* sature the result */
     out1 = __SSAT(out1, 31);
     out2 = __SSAT(out2, 31);
     out3 = __SSAT(out3, 31);
     out4 = __SSAT(out4, 31);

     /* get result in 1.31 format */
     out1 = out1 << 1;
     out2 = out2 << 1;
     out3 = out3 << 1;
     out4 = out4 << 1;

     /* store the result to destination buffer */
     *pCmplxDst++ = out1;
     *pCmplxDst++ = out2;
     *pCmplxDst++ = out3;
     *pCmplxDst++ = out4;

     /* Decrement the numSamples 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 % 0x4u;

   while(blkCnt > 0u)
   {
     /* C[2 * i] = A[2 * i] * B[i].            */
     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
     /* read real input from complex input buffer */
     inA1 = *pSrcCmplx++;
     inA2 = *pSrcCmplx++;
     /* read input from real input bufer */
     inB1 = *pSrcReal++;

     /* multiply complex input with real input */
     out1 = ((q63_t) inA1 * inB1) >> 32;
     out2 = ((q63_t) inA2 * inB1) >> 32;

     /* sature the result */
     out1 = __SSAT(out1, 31);
     out2 = __SSAT(out2, 31);

     /* get result in 1.31 format */
     out1 = out1 << 1;
     out2 = out2 << 1;

     /* store the result to destination buffer */
     *pCmplxDst++ = out1;
     *pCmplxDst++ = out2;

     /* Decrement the numSamples loop counter */
     blkCnt--;
   }

 #else

   /* Run the below code for Cortex-M0 */

   while(numSamples > 0u)
   {
     /* realOut = realA * realB.            */
     /* imagReal = imagA * realB.               */
     inA1 = *pSrcReal++;
     /* store the result in the destination buffer. */
     *pCmplxDst++ =
       (q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31);
     *pCmplxDst++ =
       (q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31);

     /* Decrement the numSamples loop counter */
     numSamples--;
   }

 #endif /* #ifndef ARM_MATH_CM0_FAMILY */

 }

 /**
  * @} end of CmplxByRealMult group
  */
	/* ----------------------------------------------------------------------
	* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
	*
	* $Date: 19. March 2015
	* $Revision: V.1.4.5
	*
	* Project: CMSIS DSP Library
	* Title: arm_cmplx_mult_real_q31.c
	*
	* Description: Q31 complex by real multiplication
	*
	* 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
	*/

	/**
	* @addtogroup CmplxByRealMult
	* @{
	*/


	/**
	* @brief Q31 complex-by-real multiplication
	* @param[in] *pSrcCmplx points to the complex input vector
	* @param[in] *pSrcReal points to the real input vector
	* @param[out] *pCmplxDst points to the complex output vector
	* @param[in] numSamples number of samples in each vector
	* @return none.
	*
	* <b>Scaling and Overflow Behavior:</b>
	* \par
	* The function uses saturating arithmetic.
	* Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.
	*/

	void arm_cmplx_mult_real_q31(
	q31_t * pSrcCmplx,
	q31_t * pSrcReal,
	q31_t * pCmplxDst,
	uint32_t numSamples)
	{
	q31_t inA1; /* Temporary variable to store input value */

	#ifndef ARM_MATH_CM0_FAMILY

	/* Run the below code for Cortex-M4 and Cortex-M3 */
	uint32_t blkCnt; /* loop counters */
	q31_t inA2, inA3, inA4; /* Temporary variables to hold input data */
	q31_t inB1, inB2; /* Temporary variabels to hold input data */
	q31_t out1, out2, out3, out4; /* Temporary variables to hold output data */

	/* 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)
	{
	/* C[2 * i] = A[2 * i] * B[i]. */
	/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
	/* read real input from complex input buffer */
	inA1 = *pSrcCmplx++;
	inA2 = *pSrcCmplx++;
	/* read input from real input bufer */
	inB1 = *pSrcReal++;
	inB2 = *pSrcReal++;
	/* read imaginary input from complex input buffer */
	inA3 = *pSrcCmplx++;
	inA4 = *pSrcCmplx++;

	/* multiply complex input with real input */
	out1 = ((q63_t) inA1 * inB1) >> 32;
	out2 = ((q63_t) inA2 * inB1) >> 32;
	out3 = ((q63_t) inA3 * inB2) >> 32;
	out4 = ((q63_t) inA4 * inB2) >> 32;

	/* sature the result */
	out1 = __SSAT(out1, 31);
	out2 = __SSAT(out2, 31);
	out3 = __SSAT(out3, 31);
	out4 = __SSAT(out4, 31);

	/* get result in 1.31 format */
	out1 = out1 << 1;
	out2 = out2 << 1;
	out3 = out3 << 1;
	out4 = out4 << 1;

	/* store the result to destination buffer */
	*pCmplxDst++ = out1;
	*pCmplxDst++ = out2;
	*pCmplxDst++ = out3;
	*pCmplxDst++ = out4;

	/* read real input from complex input buffer */
	inA1 = *pSrcCmplx++;
	inA2 = *pSrcCmplx++;
	/* read input from real input bufer */
	inB1 = *pSrcReal++;
	inB2 = *pSrcReal++;
	/* read imaginary input from complex input buffer */
	inA3 = *pSrcCmplx++;
	inA4 = *pSrcCmplx++;

	/* multiply complex input with real input */
	out1 = ((q63_t) inA1 * inB1) >> 32;
	out2 = ((q63_t) inA2 * inB1) >> 32;
	out3 = ((q63_t) inA3 * inB2) >> 32;
	out4 = ((q63_t) inA4 * inB2) >> 32;

	/* sature the result */
	out1 = __SSAT(out1, 31);
	out2 = __SSAT(out2, 31);
	out3 = __SSAT(out3, 31);
	out4 = __SSAT(out4, 31);

	/* get result in 1.31 format */
	out1 = out1 << 1;
	out2 = out2 << 1;
	out3 = out3 << 1;
	out4 = out4 << 1;

	/* store the result to destination buffer */
	*pCmplxDst++ = out1;
	*pCmplxDst++ = out2;
	*pCmplxDst++ = out3;
	*pCmplxDst++ = out4;

	/* Decrement the numSamples 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 % 0x4u;

	while(blkCnt > 0u)
	{
	/* C[2 * i] = A[2 * i] * B[i]. */
	/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
	/* read real input from complex input buffer */
	inA1 = *pSrcCmplx++;
	inA2 = *pSrcCmplx++;
	/* read input from real input bufer */
	inB1 = *pSrcReal++;

	/* multiply complex input with real input */
	out1 = ((q63_t) inA1 * inB1) >> 32;
	out2 = ((q63_t) inA2 * inB1) >> 32;

	/* sature the result */
	out1 = __SSAT(out1, 31);
	out2 = __SSAT(out2, 31);

	/* get result in 1.31 format */
	out1 = out1 << 1;
	out2 = out2 << 1;

	/* store the result to destination buffer */
	*pCmplxDst++ = out1;
	*pCmplxDst++ = out2;

	/* Decrement the numSamples loop counter */
	blkCnt--;
	}

	#else

	/* Run the below code for Cortex-M0 */

	while(numSamples > 0u)
	{
	/* realOut = realA * realB. */
	/* imagReal = imagA * realB. */
	inA1 = *pSrcReal++;
	/* store the result in the destination buffer. */
	*pCmplxDst++ =
	(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31);
	*pCmplxDst++ =
	(q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31);

	/* Decrement the numSamples loop counter */
	numSamples--;
	}

	#endif /* #ifndef ARM_MATH_CM0_FAMILY */

	}

	/**
	* @} end of CmplxByRealMult group
	*/