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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_mult_f32.c    
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*    
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* Description:  Floating-point vector 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 groupMath        
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 */
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/**        
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 * @defgroup BasicMult Vector Multiplication        
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 *        
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 * Element-by-element multiplication of two vectors.        
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 *        
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 * <pre>        
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 *     pDst[n] = pSrcA[n] * pSrcB[n],   0 <= n < blockSize.        
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 * </pre>        
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 *        
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 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.        
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 */
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/**        
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 * @addtogroup BasicMult        
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 * @{        
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 */
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/**        
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 * @brief Floating-point vector 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]       blockSize number of samples in each vector        
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 * @return none.        
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 */
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void arm_mult_f32(
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  float32_t * pSrcA,
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  float32_t * pSrcB,
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  float32_t * pDst,
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  uint32_t blockSize)
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{
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  uint32_t blkCnt;                               /* loop counters */
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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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  float32_t inA1, inA2, inA3, inA4;              /* temporary input variables */
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  float32_t inB1, inB2, inB3, inB4;              /* temporary input variables */
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  float32_t out1, out2, out3, out4;              /* temporary output variables */
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  /* loop Unrolling */
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  blkCnt = blockSize >> 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 = A * B */
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    /* Multiply the inputs and store the results in output buffer */
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    /* read sample from sourceA */
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    inA1 = *pSrcA;
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    /* read sample from sourceB */
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    inB1 = *pSrcB;
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    /* read sample from sourceA */
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    inA2 = *(pSrcA + 1);
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    /* read sample from sourceB */
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    inB2 = *(pSrcB + 1);
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    /* out = sourceA * sourceB */
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    out1 = inA1 * inB1;
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    /* read sample from sourceA */
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    inA3 = *(pSrcA + 2);
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    /* read sample from sourceB */
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    inB3 = *(pSrcB + 2);
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    /* out = sourceA * sourceB */
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    out2 = inA2 * inB2;
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    /* read sample from sourceA */
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    inA4 = *(pSrcA + 3);
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    /* store result to destination buffer */
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    *pDst = out1;
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    /* read sample from sourceB */
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    inB4 = *(pSrcB + 3);
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    /* out = sourceA * sourceB */
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    out3 = inA3 * inB3;
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    /* store result to destination buffer */
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    *(pDst + 1) = out2;
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    /* out = sourceA * sourceB */
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    out4 = inA4 * inB4;
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    /* store result to destination buffer */
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    *(pDst + 2) = out3;
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    /* store result to destination buffer */
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    *(pDst + 3) = out4;
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    /* update pointers to process next samples */
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    pSrcA += 4u;
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    pSrcB += 4u;
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    pDst += 4u;
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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 = blockSize % 0x4u;
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#else
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  /* Run the below code for Cortex-M0 */
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  /* Initialize blkCnt with number of samples */
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  blkCnt = blockSize;
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#endif /* #ifndef ARM_MATH_CM0_FAMILY */
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  while(blkCnt > 0u)
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  {
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    /* C = A * B */
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    /* Multiply the inputs and store the results in output buffer */
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    *pDst++ = (*pSrcA++) * (*pSrcB++);
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    /* Decrement the blockSize loop counter */
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    blkCnt--;
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  }
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}
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/**        
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 * @} end of BasicMult group        
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 */