1 /*
2 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Licensed under the Apache License, Version 2.0 (the License); you may
7 * not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
14 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 /* ----------------------------------------------------------------------
20 * Project: CMSIS DSP Library
21 * Title: arm_add_q7.c
22 * Description: Q7 vector addition
23 *
24 * $Date: 23 April 2021
25 * $Revision: V1.9.0
26 *
27 * Target Processor: Cortex-M and Cortex-A cores
28 * -------------------------------------------------------------------- */
29
30 #include "dsp/basic_math_functions.h"
31
32 /**
33 @ingroup groupMath
34 */
35
36 /**
37 @addtogroup BasicAdd
38 @{
39 */
40
41 /**
42 @brief Q7 vector addition.
43 @param[in] pSrcA points to the first input vector
44 @param[in] pSrcB points to the second input vector
45 @param[out] pDst points to the output vector
46 @param[in] blockSize number of samples in each vector
47 @return none
48
49 @par Scaling and Overflow Behavior
50 The function uses saturating arithmetic.
51 Results outside of the allowable Q7 range [0x80 0x7F] are saturated.
52 */
53
54 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
55
56 #include "arm_helium_utils.h"
57
arm_add_q7(const q7_t * pSrcA,const q7_t * pSrcB,q7_t * pDst,uint32_t blockSize)58 void arm_add_q7(
59 const q7_t * pSrcA,
60 const q7_t * pSrcB,
61 q7_t * pDst,
62 uint32_t blockSize)
63 {
64 uint32_t blkCnt; /* loop counters */
65 q7x16_t vecA;
66 q7x16_t vecB;
67
68 /* Compute 16 outputs at a time */
69 blkCnt = blockSize >> 4;
70 while (blkCnt > 0U)
71 {
72 /*
73 * C = A + B
74 * Add and then store the results in the destination buffer.
75 */
76 vecA = vld1q(pSrcA);
77 vecB = vld1q(pSrcB);
78 vst1q(pDst, vqaddq(vecA, vecB));
79 /*
80 * Decrement the blockSize loop counter
81 */
82 blkCnt--;
83 /*
84 * advance vector source and destination pointers
85 */
86 pSrcA += 16;
87 pSrcB += 16;
88 pDst += 16;
89 }
90 /*
91 * tail
92 */
93 blkCnt = blockSize & 0xF;
94 if (blkCnt > 0U)
95 {
96 mve_pred16_t p0 = vctp8q(blkCnt);
97 vecA = vld1q(pSrcA);
98 vecB = vld1q(pSrcB);
99 vstrbq_p(pDst, vqaddq(vecA, vecB), p0);
100 }
101 }
102 #else
arm_add_q7(const q7_t * pSrcA,const q7_t * pSrcB,q7_t * pDst,uint32_t blockSize)103 void arm_add_q7(
104 const q7_t * pSrcA,
105 const q7_t * pSrcB,
106 q7_t * pDst,
107 uint32_t blockSize)
108 {
109 uint32_t blkCnt; /* Loop counter */
110
111 #if defined (ARM_MATH_LOOPUNROLL)
112
113 /* Loop unrolling: Compute 4 outputs at a time */
114 blkCnt = blockSize >> 2U;
115
116 while (blkCnt > 0U)
117 {
118 /* C = A + B */
119
120 #if defined (ARM_MATH_DSP)
121 /* Add and store result in destination buffer (4 samples at a time). */
122 write_q7x4_ia (&pDst, __QADD8 (read_q7x4_ia ((q7_t **) &pSrcA), read_q7x4_ia ((q7_t **) &pSrcB)));
123 #else
124 *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8);
125 *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8);
126 *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8);
127 *pDst++ = (q7_t) __SSAT ((q15_t) *pSrcA++ + *pSrcB++, 8);
128 #endif
129
130 /* Decrement loop counter */
131 blkCnt--;
132 }
133
134 /* Loop unrolling: Compute remaining outputs */
135 blkCnt = blockSize % 0x4U;
136
137 #else
138
139 /* Initialize blkCnt with number of samples */
140 blkCnt = blockSize;
141
142 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
143
144 while (blkCnt > 0U)
145 {
146 /* C = A + B */
147
148 /* Add and store result in destination buffer. */
149 *pDst++ = (q7_t) __SSAT((q15_t) *pSrcA++ + *pSrcB++, 8);
150
151 /* Decrement loop counter */
152 blkCnt--;
153 }
154
155 }
156 #endif /* defined(ARM_MATH_MVEI) */
157 /**
158 @} end of BasicAdd group
159 */
160
