1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_offset_f32.c
4 * Description: Floating-point vector offset
5 *
6 * $Date: 23 April 2021
7 * $Revision: V1.9.0
8 *
9 * Target Processor: Cortex-M and Cortex-A cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2021 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 "dsp/basic_math_functions.h"
30
31 /**
32 @ingroup groupMath
33 */
34
35 /**
36 @defgroup BasicOffset Vector Offset
37
38 Adds a constant offset to each element of a vector.
39
40 <pre>
41 pDst[n] = pSrc[n] + offset, 0 <= n < blockSize.
42 </pre>
43
44 The functions support in-place computation allowing the source and
45 destination pointers to reference the same memory buffer.
46 There are separate functions for floating-point, Q7, Q15, and Q31 data types.
47 */
48
49 /**
50 @addtogroup BasicOffset
51 @{
52 */
53
54 /**
55 @brief Adds a constant offset to a floating-point vector.
56 @param[in] pSrc points to the input vector
57 @param[in] offset is the offset to be added
58 @param[out] pDst points to the output vector
59 @param[in] blockSize number of samples in each vector
60 */
61
62 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
63
64 #include "arm_helium_utils.h"
65
arm_offset_f32(const float32_t * pSrc,float32_t offset,float32_t * pDst,uint32_t blockSize)66 ARM_DSP_ATTRIBUTE void arm_offset_f32(
67 const float32_t * pSrc,
68 float32_t offset,
69 float32_t * pDst,
70 uint32_t blockSize)
71 {
72 uint32_t blkCnt; /* Loop counter */
73
74 f32x4_t vec1;
75 f32x4_t res;
76
77 /* Compute 4 outputs at a time */
78 blkCnt = blockSize >> 2U;
79 while (blkCnt > 0U)
80 {
81 /* C = A + offset */
82
83 /* Add offset and then store the results in the destination buffer. */
84 vec1 = vld1q(pSrc);
85 res = vaddq(vec1,offset);
86 vst1q(pDst, res);
87
88 /* Increment pointers */
89 pSrc += 4;
90 pDst += 4;
91
92 /* Decrement the loop counter */
93 blkCnt--;
94 }
95
96 /* Tail */
97 blkCnt = blockSize & 0x3;
98
99 if (blkCnt > 0U)
100 {
101 mve_pred16_t p0 = vctp32q(blkCnt);
102 vec1 = vld1q((float32_t const *) pSrc);
103 vstrwq_p(pDst, vaddq(vec1, offset), p0);
104 }
105
106
107 }
108
109 #else
arm_offset_f32(const float32_t * pSrc,float32_t offset,float32_t * pDst,uint32_t blockSize)110 ARM_DSP_ATTRIBUTE void arm_offset_f32(
111 const float32_t * pSrc,
112 float32_t offset,
113 float32_t * pDst,
114 uint32_t blockSize)
115 {
116 uint32_t blkCnt; /* Loop counter */
117
118 #if defined(ARM_MATH_NEON_EXPERIMENTAL) && !defined(ARM_MATH_AUTOVECTORIZE)
119 f32x4_t vec1;
120 f32x4_t res;
121
122 /* Compute 4 outputs at a time */
123 blkCnt = blockSize >> 2U;
124
125 while (blkCnt > 0U)
126 {
127 /* C = A + offset */
128
129 /* Add offset and then store the results in the destination buffer. */
130 vec1 = vld1q_f32(pSrc);
131 res = vaddq_f32(vec1,vdupq_n_f32(offset));
132 vst1q_f32(pDst, res);
133
134 /* Increment pointers */
135 pSrc += 4;
136 pDst += 4;
137
138 /* Decrement the loop counter */
139 blkCnt--;
140 }
141
142 /* Tail */
143 blkCnt = blockSize & 0x3;
144
145 #else
146 #if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
147
148 /* Loop unrolling: Compute 4 outputs at a time */
149 blkCnt = blockSize >> 2U;
150
151 while (blkCnt > 0U)
152 {
153 /* C = A + offset */
154
155 /* Add offset and store result in destination buffer. */
156 *pDst++ = (*pSrc++) + offset;
157
158 *pDst++ = (*pSrc++) + offset;
159
160 *pDst++ = (*pSrc++) + offset;
161
162 *pDst++ = (*pSrc++) + offset;
163
164 /* Decrement loop counter */
165 blkCnt--;
166 }
167
168 /* Loop unrolling: Compute remaining outputs */
169 blkCnt = blockSize % 0x4U;
170
171 #else
172
173 /* Initialize blkCnt with number of samples */
174 blkCnt = blockSize;
175
176 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
177 #endif /* #if defined(ARM_MATH_NEON_EXPERIMENTAL) */
178
179 while (blkCnt > 0U)
180 {
181 /* C = A + offset */
182
183 /* Add offset and store result in destination buffer. */
184 *pDst++ = (*pSrc++) + offset;
185
186 /* Decrement loop counter */
187 blkCnt--;
188 }
189
190 }
191 #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
192
193 /**
194 @} end of BasicOffset group
195 */
196
