| 1 | /* ----------------------------------------------------------------------
|
|---|
| 2 | * Project: CMSIS DSP Library
|
|---|
| 3 | * Title: arm_add_q7.c
|
|---|
| 4 | * Description: Q7 vector addition
|
|---|
| 5 | *
|
|---|
| 6 | * $Date: 27. January 2017
|
|---|
| 7 | * $Revision: V.1.5.1
|
|---|
| 8 | *
|
|---|
| 9 | * Target Processor: Cortex-M cores
|
|---|
| 10 | * -------------------------------------------------------------------- */
|
|---|
| 11 | /*
|
|---|
| 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
|
|---|
| 13 | *
|
|---|
| 14 | * SPDX-License-Identifier: Apache-2.0
|
|---|
| 15 | *
|
|---|
| 16 | * Licensed under the Apache License, Version 2.0 (the License); you may
|
|---|
| 17 | * not use this file except in compliance with the License.
|
|---|
| 18 | * You may obtain a copy of the License at
|
|---|
| 19 | *
|
|---|
| 20 | * www.apache.org/licenses/LICENSE-2.0
|
|---|
| 21 | *
|
|---|
| 22 | * Unless required by applicable law or agreed to in writing, software
|
|---|
| 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT
|
|---|
| 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|---|
| 25 | * See the License for the specific language governing permissions and
|
|---|
| 26 | * limitations under the License.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | #include "arm_math.h"
|
|---|
| 30 |
|
|---|
| 31 | /**
|
|---|
| 32 | * @ingroup groupMath
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | /**
|
|---|
| 36 | * @addtogroup BasicAdd
|
|---|
| 37 | * @{
|
|---|
| 38 | */
|
|---|
| 39 |
|
|---|
| 40 | /**
|
|---|
| 41 | * @brief Q7 vector addition.
|
|---|
| 42 | * @param[in] *pSrcA points to the first input vector
|
|---|
| 43 | * @param[in] *pSrcB points to the second input vector
|
|---|
| 44 | * @param[out] *pDst points to the output vector
|
|---|
| 45 | * @param[in] blockSize number of samples in each vector
|
|---|
| 46 | * @return none.
|
|---|
| 47 | *
|
|---|
| 48 | * <b>Scaling and Overflow Behavior:</b>
|
|---|
| 49 | * \par
|
|---|
| 50 | * The function uses saturating arithmetic.
|
|---|
| 51 | * Results outside of the allowable Q7 range [0x80 0x7F] will be saturated.
|
|---|
| 52 | */
|
|---|
| 53 |
|
|---|
| 54 | void arm_add_q7(
|
|---|
| 55 | q7_t * pSrcA,
|
|---|
| 56 | q7_t * pSrcB,
|
|---|
| 57 | q7_t * pDst,
|
|---|
| 58 | uint32_t blockSize)
|
|---|
| 59 | {
|
|---|
| 60 | uint32_t blkCnt; /* loop counter */
|
|---|
| 61 |
|
|---|
| 62 | #if defined (ARM_MATH_DSP)
|
|---|
| 63 |
|
|---|
| 64 | /* Run the below code for Cortex-M4 and Cortex-M3 */
|
|---|
| 65 |
|
|---|
| 66 |
|
|---|
| 67 | /*loop Unrolling */
|
|---|
| 68 | blkCnt = blockSize >> 2U;
|
|---|
| 69 |
|
|---|
| 70 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
|
|---|
| 71 | ** a second loop below computes the remaining 1 to 3 samples. */
|
|---|
| 72 | while (blkCnt > 0U)
|
|---|
| 73 | {
|
|---|
| 74 | /* C = A + B */
|
|---|
| 75 | /* Add and then store the results in the destination buffer. */
|
|---|
| 76 | *__SIMD32(pDst)++ = __QADD8(*__SIMD32(pSrcA)++, *__SIMD32(pSrcB)++);
|
|---|
| 77 |
|
|---|
| 78 | /* Decrement the loop counter */
|
|---|
| 79 | blkCnt--;
|
|---|
| 80 | }
|
|---|
| 81 |
|
|---|
| 82 | /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
|
|---|
| 83 | ** No loop unrolling is used. */
|
|---|
| 84 | blkCnt = blockSize % 0x4U;
|
|---|
| 85 |
|
|---|
| 86 | while (blkCnt > 0U)
|
|---|
| 87 | {
|
|---|
| 88 | /* C = A + B */
|
|---|
| 89 | /* Add and then store the results in the destination buffer. */
|
|---|
| 90 | *pDst++ = (q7_t) __SSAT(*pSrcA++ + *pSrcB++, 8);
|
|---|
| 91 |
|
|---|
| 92 | /* Decrement the loop counter */
|
|---|
| 93 | blkCnt--;
|
|---|
| 94 | }
|
|---|
| 95 |
|
|---|
| 96 | #else
|
|---|
| 97 |
|
|---|
| 98 | /* Run the below code for Cortex-M0 */
|
|---|
| 99 |
|
|---|
| 100 |
|
|---|
| 101 |
|
|---|
| 102 | /* Initialize blkCnt with number of samples */
|
|---|
| 103 | blkCnt = blockSize;
|
|---|
| 104 |
|
|---|
| 105 | while (blkCnt > 0U)
|
|---|
| 106 | {
|
|---|
| 107 | /* C = A + B */
|
|---|
| 108 | /* Add and then store the results in the destination buffer. */
|
|---|
| 109 | *pDst++ = (q7_t) __SSAT((q15_t) * pSrcA++ + *pSrcB++, 8);
|
|---|
| 110 |
|
|---|
| 111 | /* Decrement the loop counter */
|
|---|
| 112 | blkCnt--;
|
|---|
| 113 | }
|
|---|
| 114 |
|
|---|
| 115 | #endif /* #if defined (ARM_MATH_DSP) */
|
|---|
| 116 |
|
|---|
| 117 |
|
|---|
| 118 | }
|
|---|
| 119 |
|
|---|
| 120 | /**
|
|---|
| 121 | * @} end of BasicAdd group
|
|---|
| 122 | */
|
|---|
