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  1. /* ----------------------------------------------------------------------
  2.  * Project:      CMSIS DSP Library
  3.  * Title:        arm_mult_f32.c
  4.  * Description:  Floating-point vector multiplication
  5.  *
  6.  * $Date:        27. January 2017
  7.  * $Revision:    V.1.5.1
  8.  *
  9.  * Target Processor: Cortex-M cores
  10.  * -------------------------------------------------------------------- */
  11. /*
  12.  * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
  13.  *
  14.  * SPDX-License-Identifier: Apache-2.0
  15.  *
  16.  * Licensed under the Apache License, Version 2.0 (the License); you may
  17.  * not use this file except in compliance with the License.
  18.  * You may obtain a copy of the License at
  19.  *
  20.  * www.apache.org/licenses/LICENSE-2.0
  21.  *
  22.  * Unless required by applicable law or agreed to in writing, software
  23.  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  24.  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  25.  * See the License for the specific language governing permissions and
  26.  * limitations under the License.
  27.  */
  28.  
  29. #include "arm_math.h"
  30.  
  31. /**
  32.  * @ingroup groupMath
  33.  */
  34.  
  35. /**
  36.  * @defgroup BasicMult Vector Multiplication
  37.  *
  38.  * Element-by-element multiplication of two vectors.
  39.  *
  40.  * <pre>
  41.  *     pDst[n] = pSrcA[n] * pSrcB[n],   0 <= n < blockSize.
  42.  * </pre>
  43.  *
  44.  * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
  45.  */
  46.  
  47. /**
  48.  * @addtogroup BasicMult
  49.  * @{
  50.  */
  51.  
  52. /**
  53.  * @brief Floating-point vector multiplication.
  54.  * @param[in]       *pSrcA points to the first input vector
  55.  * @param[in]       *pSrcB points to the second input vector
  56.  * @param[out]      *pDst points to the output vector
  57.  * @param[in]       blockSize number of samples in each vector
  58.  * @return none.
  59.  */
  60.  
  61. void arm_mult_f32(
  62.   float32_t * pSrcA,
  63.   float32_t * pSrcB,
  64.   float32_t * pDst,
  65.   uint32_t blockSize)
  66. {
  67.   uint32_t blkCnt;                               /* loop counters */
  68. #if defined (ARM_MATH_DSP)
  69.  
  70.   /* Run the below code for Cortex-M4 and Cortex-M3 */
  71.   float32_t inA1, inA2, inA3, inA4;              /* temporary input variables */
  72.   float32_t inB1, inB2, inB3, inB4;              /* temporary input variables */
  73.   float32_t out1, out2, out3, out4;              /* temporary output variables */
  74.  
  75.   /* loop Unrolling */
  76.   blkCnt = blockSize >> 2U;
  77.  
  78.   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  79.    ** a second loop below computes the remaining 1 to 3 samples. */
  80.   while (blkCnt > 0U)
  81.   {
  82.     /* C = A * B */
  83.     /* Multiply the inputs and store the results in output buffer */
  84.     /* read sample from sourceA */
  85.     inA1 = *pSrcA;
  86.     /* read sample from sourceB */
  87.     inB1 = *pSrcB;
  88.     /* read sample from sourceA */
  89.     inA2 = *(pSrcA + 1);
  90.     /* read sample from sourceB */
  91.     inB2 = *(pSrcB + 1);
  92.  
  93.     /* out = sourceA * sourceB */
  94.     out1 = inA1 * inB1;
  95.  
  96.     /* read sample from sourceA */
  97.     inA3 = *(pSrcA + 2);
  98.     /* read sample from sourceB */
  99.     inB3 = *(pSrcB + 2);
  100.  
  101.     /* out = sourceA * sourceB */
  102.     out2 = inA2 * inB2;
  103.  
  104.     /* read sample from sourceA */
  105.     inA4 = *(pSrcA + 3);
  106.  
  107.     /* store result to destination buffer */
  108.     *pDst = out1;
  109.  
  110.     /* read sample from sourceB */
  111.     inB4 = *(pSrcB + 3);
  112.  
  113.     /* out = sourceA * sourceB */
  114.     out3 = inA3 * inB3;
  115.  
  116.     /* store result to destination buffer */
  117.     *(pDst + 1) = out2;
  118.  
  119.     /* out = sourceA * sourceB */
  120.     out4 = inA4 * inB4;
  121.     /* store result to destination buffer */
  122.     *(pDst + 2) = out3;
  123.     /* store result to destination buffer */
  124.     *(pDst + 3) = out4;
  125.  
  126.  
  127.     /* update pointers to process next samples */
  128.     pSrcA += 4U;
  129.     pSrcB += 4U;
  130.     pDst += 4U;
  131.  
  132.     /* Decrement the blockSize loop counter */
  133.     blkCnt--;
  134.   }
  135.  
  136.   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  137.    ** No loop unrolling is used. */
  138.   blkCnt = blockSize % 0x4U;
  139.  
  140. #else
  141.  
  142.   /* Run the below code for Cortex-M0 */
  143.  
  144.   /* Initialize blkCnt with number of samples */
  145.   blkCnt = blockSize;
  146.  
  147. #endif /* #if defined (ARM_MATH_DSP) */
  148.  
  149.   while (blkCnt > 0U)
  150.   {
  151.     /* C = A * B */
  152.     /* Multiply the inputs and store the results in output buffer */
  153.     *pDst++ = (*pSrcA++) * (*pSrcB++);
  154.  
  155.     /* Decrement the blockSize loop counter */
  156.     blkCnt--;
  157.   }
  158. }
  159.  
  160. /**
  161.  * @} end of BasicMult group
  162.  */
  163.