CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details
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arm_mult_f32.c
00001 /* ---------------------------------------------------------------------- 00002 * Copyright (C) 2010 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_mult_f32.c 00009 * 00010 * Description: Floating-point vector multiplication. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3 00013 * 00014 * Version 1.0.3 2010/11/29 00015 * Re-organized the CMSIS folders and updated documentation. 00016 * 00017 * Version 1.0.2 2010/11/11 00018 * Documentation updated. 00019 * 00020 * Version 1.0.1 2010/10/05 00021 * Production release and review comments incorporated. 00022 * 00023 * Version 1.0.0 2010/09/20 00024 * Production release and review comments incorporated. 00025 * 00026 * Version 0.0.5 2010/04/26 00027 * incorporated review comments and updated with latest CMSIS layer 00028 * 00029 * Version 0.0.3 2010/03/10 00030 * Initial version 00031 * -------------------------------------------------------------------- */ 00032 00033 #include "arm_math.h" 00034 00035 /** 00036 * @ingroup groupMath 00037 */ 00038 00039 /** 00040 * @defgroup BasicMult Vector Multiplication 00041 * 00042 * Element-by-element multiplication of two vectors. 00043 * 00044 * <pre> 00045 * pDst[n] = pSrcA[n] * pSrcB[n], 0 <= n < blockSize. 00046 * </pre> 00047 * 00048 * There are separate functions for floating-point, Q7, Q15, and Q31 data types. 00049 */ 00050 00051 /** 00052 * @addtogroup BasicMult 00053 * @{ 00054 */ 00055 00056 /** 00057 * @brief Floating-point vector multiplication. 00058 * @param[in] *pSrcA points to the first input vector 00059 * @param[in] *pSrcB points to the second input vector 00060 * @param[out] *pDst points to the output vector 00061 * @param[in] blockSize number of samples in each vector 00062 * @return none. 00063 */ 00064 00065 void arm_mult_f32( 00066 float32_t * pSrcA, 00067 float32_t * pSrcB, 00068 float32_t * pDst, 00069 uint32_t blockSize) 00070 { 00071 uint32_t blkCnt; /* loop counters */ 00072 00073 /* loop Unrolling */ 00074 blkCnt = blockSize >> 2u; 00075 00076 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00077 ** a second loop below computes the remaining 1 to 3 samples. */ 00078 while(blkCnt > 0u) 00079 { 00080 /* C = A * B */ 00081 /* Multiply the inputs and store the results in output buffer */ 00082 *pDst++ = (*pSrcA++) * (*pSrcB++); 00083 *pDst++ = (*pSrcA++) * (*pSrcB++); 00084 *pDst++ = (*pSrcA++) * (*pSrcB++); 00085 *pDst++ = (*pSrcA++) * (*pSrcB++); 00086 00087 /* Decrement the blockSize loop counter */ 00088 blkCnt--; 00089 } 00090 00091 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00092 ** No loop unrolling is used. */ 00093 blkCnt = blockSize % 0x4u; 00094 00095 while(blkCnt > 0u) 00096 { 00097 /* C = A * B */ 00098 /* Multiply the inputs and store the results in output buffer */ 00099 *pDst++ = (*pSrcA++) * (*pSrcB++); 00100 00101 /* Decrement the blockSize loop counter */ 00102 blkCnt--; 00103 } 00104 } 00105 00106 /** 00107 * @} end of BasicMult group 00108 */
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