CMSIS DSP Software Library: arm_dot_prod_q7.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_dot_prod_q7.c Go to the documentation of this file.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_dot_prod_q7.c 00009 * 00010 * Description: Q7 dot product. 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 0.0.7 2010/06/10 00027 * Misra-C changes done 00028 * -------------------------------------------------------------------- */ 00029 00030 #include "arm_math.h" 00031 00058 void arm_dot_prod_q7( 00059 q7_t * pSrcA, 00060 q7_t * pSrcB, 00061 uint32_t blockSize, 00062 q31_t * result) 00063 { 00064 q31_t input1, input2; /* Temporary variables to store input */ 00065 q15_t in1, in2; /* Temporary variables to store input */ 00066 q31_t sum = 0; /* Temporary variables to store output */ 00067 uint32_t blkCnt; /* loop counter */ 00068 00069 00070 00071 /*loop Unrolling */ 00072 blkCnt = blockSize >> 2u; 00073 00074 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00075 ** a second loop below computes the remaining 1 to 3 samples. */ 00076 while(blkCnt > 0u) 00077 { 00078 /* Reading two inputs of SrcA buffer and packing */ 00079 in1 = (q15_t) * pSrcA++; 00080 in2 = (q15_t) * pSrcA++; 00081 input1 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16); 00082 00083 /* Reading two inputs of SrcB buffer and packing */ 00084 in1 = (q15_t) * pSrcB++; 00085 in2 = (q15_t) * pSrcB++; 00086 input2 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16); 00087 00088 /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */ 00089 /* Perform Dot product of 2 packed inputs using SMLALD and store the result in a temporary variable. */ 00090 sum = __SMLAD(input1, input2, sum); 00091 00092 /* Reading two inputs of SrcA buffer and packing */ 00093 in1 = (q15_t) * pSrcA++; 00094 in2 = (q15_t) * pSrcA++; 00095 input1 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16); 00096 00097 /* Reading two inputs of SrcB buffer and packing */ 00098 in1 = (q15_t) * pSrcB++; 00099 in2 = (q15_t) * pSrcB++; 00100 input2 = ((q31_t) in1 & 0x0000FFFF) | ((q31_t) in2 << 16); 00101 00102 /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */ 00103 /* Perform Dot product of 2 packed inputs using SMLALD and store the result in a temporary variable. */ 00104 sum = __SMLAD(input1, input2, sum); 00105 00106 00107 00108 /* Decrement the loop counter */ 00109 blkCnt--; 00110 } 00111 00112 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00113 ** No loop unrolling is used. */ 00114 blkCnt = blockSize % 0x4u; 00115 00116 while(blkCnt > 0u) 00117 { 00118 /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */ 00119 /* Dot product and then store the results in a temporary buffer. */ 00120 sum = __SMLAD(*pSrcA++, *pSrcB++, sum); 00121 00122 /* Decrement the loop counter */ 00123 blkCnt--; 00124 } 00125 00126 /* Store the result in the destination buffer in 18.14 format */ 00127 *result = sum; 00128 } 00129  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:56 for CMSIS DSP Software Library by  1.7.2

Wyszukiwarka

Podobne podstrony:
arm dot prod q31? source
arm dot prod q7?
arm dot prod q15? source
arm dot prod ?2? source
arm cmplx dot prod q31? source
arm cmplx dot prod ?2? source
arm cmplx dot prod q15? source
arm conv partial q7? source
arm float to q7? source
arm q15 to q7? source
arm dot prod q15?
arm dot prod ?2?
arm fir init q7? source
arm fir sparse q7? source
arm dot prod q31?
arm q31 to q7? source
arm ?s q7? source
arm shift q7? source
arm offset q7? source

więcej podobnych podstron