CMSIS DSP Software Library: arm_sub_q15.c Source File Main Page Modules Data Structures Files Examples File List Globals arm_sub_q15.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_sub_q15.c 00009 * 00010 * Description: Q15 vector subtraction. 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 00055 void arm_sub_q15( 00056 q15_t * pSrcA, 00057 q15_t * pSrcB, 00058 q15_t * pDst, 00059 uint32_t blockSize) 00060 { 00061 uint32_t blkCnt; /* loop counter */ 00062 00063 00064 /*loop Unrolling */ 00065 blkCnt = blockSize >> 2u; 00066 00067 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00068 ** a second loop below computes the remaining 1 to 3 samples. */ 00069 while(blkCnt > 0u) 00070 { 00071 /* C = A - B */ 00072 /* Subtract and then store the results in the destination buffer two samples at a time. */ 00073 *__SIMD32(pDst)++ = __QSUB16(*__SIMD32(pSrcA)++, *__SIMD32(pSrcB)++); 00074 *__SIMD32(pDst)++ = __QSUB16(*__SIMD32(pSrcA)++, *__SIMD32(pSrcB)++); 00075 00076 /* Decrement the loop counter */ 00077 blkCnt--; 00078 } 00079 00080 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00081 ** No loop unrolling is used. */ 00082 blkCnt = blockSize % 0x4u; 00083 00084 while(blkCnt > 0u) 00085 { 00086 /* C = A - B */ 00087 /* Subtract and then store the result in the destination buffer. */ 00088 *pDst++ = (q15_t) __QSUB16(*pSrcA++, *pSrcB++); 00089 00090 /* Decrement the loop counter */ 00091 blkCnt--; 00092 } 00093 00094 } 00095  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:57 for CMSIS DSP Software Library by  1.7.2

Wyszukiwarka

Podobne podstrony:
arm mat sub q15? source
arm conv q15? source
arm shift q15? source
arm scale q15? source
arm sin q15? source
arm sub q31? source
arm rms q15? source
arm mult q15? source
arm sub q15?
arm copy q15? source
arm min q15? source
arm std q15? source
arm ?s q15? source
arm var q15? source
arm negate q15? source
arm sub q7? source
arm ?t4 q15? source
arm lms q15? source
arm fill q15? source

więcej podobnych podstron