DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_f32.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_f32.c
 *
 * Description:	Floating-point 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
  */

 /**
  * @defgroup CmplxByRealMult Complex-by-Real Multiplication
  *
  * Multiplies a complex vector by a real vector and generates a complex result.
  * The data in the complex arrays is stored in an interleaved fashion
  * (real, imag, real, imag, ...).
  * The parameter <code>numSamples</code> represents the number of complex
  * samples processed.  The complex arrays have a total of <code>2*numSamples</code>
  * real values while the real array has a total of <code>numSamples</code>
  * real values.
  *
  * The underlying algorithm is used:
  *
  * <pre>
  * for(n=0; n<numSamples; n++) {
  *     pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n];
  *     pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n];
  * }
  * </pre>
  *
  * There are separate functions for floating-point, Q15, and Q31 data types.
  */

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


 /**
  * @brief  Floating-point 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.
  */

 void arm_cmplx_mult_real_f32(
   float32_t * pSrcCmplx,
   float32_t * pSrcReal,
   float32_t * pCmplxDst,
   uint32_t numSamples)
 {
   float32_t in;                                  /* Temporary variable to store input value */
   uint32_t blkCnt;                               /* loop counters */

 #ifndef ARM_MATH_CM0_FAMILY

   /* Run the below code for Cortex-M4 and Cortex-M3 */
   float32_t inA1, inA2, inA3, inA4;              /* Temporary variables to hold input data */
   float32_t inA5, inA6, inA7, inA8;              /* Temporary variables to hold input data */
   float32_t inB1, inB2, inB3, inB4;              /* Temporary variables to hold input data */
   float32_t out1, out2, out3, out4;              /* Temporary variables to hold output data */
   float32_t out5, out6, out7, out8;              /* 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 input from complex input buffer */
     inA1 = pSrcCmplx[0];
     inA2 = pSrcCmplx[1];
     /* read input from real input buffer */
     inB1 = pSrcReal[0];

     /* read input from complex input buffer */
     inA3 = pSrcCmplx[2];

     /* multiply complex buffer real input with real buffer input */
     out1 = inA1 * inB1;

     /* read input from complex input buffer */
     inA4 = pSrcCmplx[3];

     /* multiply complex buffer imaginary input with real buffer input */
     out2 = inA2 * inB1;

     /* read input from real input buffer */
     inB2 = pSrcReal[1];
     /* read input from complex input buffer */
     inA5 = pSrcCmplx[4];

     /* multiply complex buffer real input with real buffer input */
     out3 = inA3 * inB2;

     /* read input from complex input buffer */
     inA6 = pSrcCmplx[5];
     /* read input from real input buffer */
     inB3 = pSrcReal[2];

     /* multiply complex buffer imaginary input with real buffer input */
     out4 = inA4 * inB2;

     /* read input from complex input buffer */
     inA7 = pSrcCmplx[6];

     /* multiply complex buffer real input with real buffer input */
     out5 = inA5 * inB3;

     /* read input from complex input buffer */
     inA8 = pSrcCmplx[7];

     /* multiply complex buffer imaginary input with real buffer input */
     out6 = inA6 * inB3;

     /* read input from real input buffer */
     inB4 = pSrcReal[3];

     /* store result to destination bufer */
     pCmplxDst[0] = out1;

     /* multiply complex buffer real input with real buffer input */
     out7 = inA7 * inB4;

     /* store result to destination bufer */
     pCmplxDst[1] = out2;

     /* multiply complex buffer imaginary input with real buffer input */
     out8 = inA8 * inB4;

     /* store result to destination bufer */
     pCmplxDst[2] = out3;
     pCmplxDst[3] = out4;
     pCmplxDst[4] = out5;

     /* incremnet complex input buffer by 8 to process next samples */
     pSrcCmplx += 8u;

     /* store result to destination bufer */
     pCmplxDst[5] = out6;

     /* increment real input buffer by 4 to process next samples */
     pSrcReal += 4u;

     /* store result to destination bufer */
     pCmplxDst[6] = out7;
     pCmplxDst[7] = out8;

     /* increment destination buffer by 8 to process next sampels */
     pCmplxDst += 8u;

     /* 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;

 #else

   /* Run the below code for Cortex-M0 */
   blkCnt = numSamples;

 #endif /* #ifndef ARM_MATH_CM0_FAMILY */

   while(blkCnt > 0u)
   {
     /* C[2 * i] = A[2 * i] * B[i].            */
     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
     in = *pSrcReal++;
     /* store the result in the destination buffer. */
     *pCmplxDst++ = (*pSrcCmplx++) * (in);
     *pCmplxDst++ = (*pSrcCmplx++) * (in);

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

 /**
  * @} 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_f32.c
	*
	* Description: Floating-point 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
	*/

	/**
	* @defgroup CmplxByRealMult Complex-by-Real Multiplication
	*
	* Multiplies a complex vector by a real vector and generates a complex result.
	* The data in the complex arrays is stored in an interleaved fashion
	* (real, imag, real, imag, ...).
	* The parameter <code>numSamples</code> represents the number of complex
	* samples processed. The complex arrays have a total of <code>2*numSamples</code>
	* real values while the real array has a total of <code>numSamples</code>
	* real values.
	*
	* The underlying algorithm is used:
	*
	* <pre>
	* for(n=0; n<numSamples; n++) {
	* pCmplxDst[(2n)+0] = pSrcCmplx[(2n)+0] * pSrcReal[n];
	* pCmplxDst[(2n)+1] = pSrcCmplx[(2n)+1] * pSrcReal[n];
	* }
	* </pre>
	*
	* There are separate functions for floating-point, Q15, and Q31 data types.
	*/

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


	/**
	* @brief Floating-point 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.
	*/

	void arm_cmplx_mult_real_f32(
	float32_t * pSrcCmplx,
	float32_t * pSrcReal,
	float32_t * pCmplxDst,
	uint32_t numSamples)
	{
	float32_t in; /* Temporary variable to store input value */
	uint32_t blkCnt; /* loop counters */

	#ifndef ARM_MATH_CM0_FAMILY

	/* Run the below code for Cortex-M4 and Cortex-M3 */
	float32_t inA1, inA2, inA3, inA4; /* Temporary variables to hold input data */
	float32_t inA5, inA6, inA7, inA8; /* Temporary variables to hold input data */
	float32_t inB1, inB2, inB3, inB4; /* Temporary variables to hold input data */
	float32_t out1, out2, out3, out4; /* Temporary variables to hold output data */
	float32_t out5, out6, out7, out8; /* 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 input from complex input buffer */
	inA1 = pSrcCmplx[0];
	inA2 = pSrcCmplx[1];
	/* read input from real input buffer */
	inB1 = pSrcReal[0];

	/* read input from complex input buffer */
	inA3 = pSrcCmplx[2];

	/* multiply complex buffer real input with real buffer input */
	out1 = inA1 * inB1;

	/* read input from complex input buffer */
	inA4 = pSrcCmplx[3];

	/* multiply complex buffer imaginary input with real buffer input */
	out2 = inA2 * inB1;

	/* read input from real input buffer */
	inB2 = pSrcReal[1];
	/* read input from complex input buffer */
	inA5 = pSrcCmplx[4];

	/* multiply complex buffer real input with real buffer input */
	out3 = inA3 * inB2;

	/* read input from complex input buffer */
	inA6 = pSrcCmplx[5];
	/* read input from real input buffer */
	inB3 = pSrcReal[2];

	/* multiply complex buffer imaginary input with real buffer input */
	out4 = inA4 * inB2;

	/* read input from complex input buffer */
	inA7 = pSrcCmplx[6];

	/* multiply complex buffer real input with real buffer input */
	out5 = inA5 * inB3;

	/* read input from complex input buffer */
	inA8 = pSrcCmplx[7];

	/* multiply complex buffer imaginary input with real buffer input */
	out6 = inA6 * inB3;

	/* read input from real input buffer */
	inB4 = pSrcReal[3];

	/* store result to destination bufer */
	pCmplxDst[0] = out1;

	/* multiply complex buffer real input with real buffer input */
	out7 = inA7 * inB4;

	/* store result to destination bufer */
	pCmplxDst[1] = out2;

	/* multiply complex buffer imaginary input with real buffer input */
	out8 = inA8 * inB4;

	/* store result to destination bufer */
	pCmplxDst[2] = out3;
	pCmplxDst[3] = out4;
	pCmplxDst[4] = out5;

	/* incremnet complex input buffer by 8 to process next samples */
	pSrcCmplx += 8u;

	/* store result to destination bufer */
	pCmplxDst[5] = out6;

	/* increment real input buffer by 4 to process next samples */
	pSrcReal += 4u;

	/* store result to destination bufer */
	pCmplxDst[6] = out7;
	pCmplxDst[7] = out8;

	/* increment destination buffer by 8 to process next sampels */
	pCmplxDst += 8u;

	/* 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;

	#else

	/* Run the below code for Cortex-M0 */
	blkCnt = numSamples;

	#endif /* #ifndef ARM_MATH_CM0_FAMILY */

	while(blkCnt > 0u)
	{
	/* C[2 * i] = A[2 * i] * B[i]. */
	/* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
	in = *pSrcReal++;
	/* store the result in the destination buffer. */
	pCmplxDst++ = (pSrcCmplx++) * (in);
	pCmplxDst++ = (pSrcCmplx++) * (in);

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

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