| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_add_q7.c |
| * Description: Q7 vector addition |
| * |
| * $Date: 18. March 2019 |
| * $Revision: V1.6.0 |
| * |
| * Target Processor: Cortex-M cores |
| * -------------------------------------------------------------------- */ |
| /* |
| * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the License); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "arm_math.h" |
| |
| /** |
| @ingroup groupMath |
| */ |
| |
| /** |
| @addtogroup BasicAdd |
| @{ |
| */ |
| |
| /** |
| @brief Q7 vector addition. |
| @param[in] pSrcA points to the first input vector |
| @param[in] pSrcB points to the second input vector |
| @param[out] pDst points to the output vector |
| @param[in] blockSize number of samples in each vector |
| @return none |
| |
| @par Scaling and Overflow Behavior |
| The function uses saturating arithmetic. |
| Results outside of the allowable Q7 range [0x80 0x7F] are saturated. |
| */ |
| |
| void arm_add_q7( |
| const q7_t * pSrcA, |
| const q7_t * pSrcB, |
| q7_t * pDst, |
| uint32_t blockSize) |
| { |
| uint32_t blkCnt; /* Loop counter */ |
| |
| #if defined (ARM_MATH_LOOPUNROLL) |
| |
| /* Loop unrolling: Compute 4 outputs at a time */ |
| blkCnt = blockSize >> 2U; |
| |
| while (blkCnt > 0U) |
| { |
| /* C = A + B */ |
| |
| #if defined (ARM_MATH_DSP) |
| /* Add and store result in destination buffer (4 samples at a time). */ |
| write_q7x4_ia (&pDst, __QADD8 (read_q7x4_ia ((q7_t **) &pSrcA), read_q7x4_ia ((q7_t **) &pSrcB))); |
| #else |
| *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8); |
| *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8); |
| *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8); |
| *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8); |
| #endif |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| /* Loop unrolling: Compute remaining outputs */ |
| blkCnt = blockSize % 0x4U; |
| |
| #else |
| |
| /* Initialize blkCnt with number of samples */ |
| blkCnt = blockSize; |
| |
| #endif /* #if defined (ARM_MATH_LOOPUNROLL) */ |
| |
| while (blkCnt > 0U) |
| { |
| /* C = A + B */ |
| |
| /* Add and store result in destination buffer. */ |
| *pDst++ = (q7_t) __SSAT((q15_t) *pSrcA++ + *pSrcB++, 8); |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| } |
| |
| /** |
| @} end of BasicAdd group |
| */ |