CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details
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arm_add_q7.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_add_q7.c 00009 * 00010 * Description: Q7 vector addition. 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 00032 /** 00033 * @ingroup groupMath 00034 */ 00035 00036 /** 00037 * @addtogroup BasicAdd 00038 * @{ 00039 */ 00040 00041 /** 00042 * @brief Q7 vector addition. 00043 * @param[in] *pSrcA points to the first input vector 00044 * @param[in] *pSrcB points to the second input vector 00045 * @param[out] *pDst points to the output vector 00046 * @param[in] blockSize number of samples in each vector 00047 * @return none. 00048 * 00049 * <b>Scaling and Overflow Behavior:</b> 00050 * \par 00051 * The function uses saturating arithmetic. 00052 * Results outside of the allowable Q7 range [0x80 0x7F] will be saturated. 00053 */ 00054 00055 void arm_add_q7( 00056 q7_t * pSrcA, 00057 q7_t * pSrcB, 00058 q7_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 /* Add and then store the results in the destination buffer. */ 00073 *__SIMD32(pDst)++ = __QADD8(*__SIMD32(pSrcA)++, *__SIMD32(pSrcB)++); 00074 00075 /* Decrement the loop counter */ 00076 blkCnt--; 00077 } 00078 00079 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00080 ** No loop unrolling is used. */ 00081 blkCnt = blockSize % 0x4u; 00082 00083 while(blkCnt > 0u) 00084 { 00085 /* C = A + B */ 00086 /* Add and then store the results in the destination buffer. */ 00087 *pDst++ = (q7_t) __SSAT(*pSrcA++ + *pSrcB++, 8); 00088 00089 /* Decrement the loop counter */ 00090 blkCnt--; 00091 } 00092 00093 } 00094 00095 /** 00096 * @} end of BasicAdd group 00097 */
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