1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_offset_f16.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_f16.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 @return none
61 */
62
63 #if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
64
65 #include "arm_helium_utils.h"
66
arm_offset_f16(const float16_t * pSrc,float16_t offset,float16_t * pDst,uint32_t blockSize)67 void arm_offset_f16(
68 const float16_t * pSrc,
69 float16_t offset,
70 float16_t * pDst,
71 uint32_t blockSize)
72 {
73 uint32_t blkCnt; /* Loop counter */
74
75 f16x8_t vec1;
76 f16x8_t res;
77
78 /* Compute 4 outputs at a time */
79 blkCnt = blockSize >> 3U;
80 while (blkCnt > 0U)
81 {
82 /* C = A + offset */
83
84 /* Add offset and then store the results in the destination buffer. */
85 vec1 = vld1q(pSrc);
86 res = vaddq(vec1,offset);
87 vst1q(pDst, res);
88
89 /* Increment pointers */
90 pSrc += 8;
91 pDst += 8;
92
93 /* Decrement the loop counter */
94 blkCnt--;
95 }
96
97 /* Tail */
98 blkCnt = blockSize & 0x7;
99
100 if (blkCnt > 0U)
101 {
102 mve_pred16_t p0 = vctp16q(blkCnt);
103 vec1 = vld1q((float16_t const *) pSrc);
104 vstrhq_p(pDst, vaddq(vec1, offset), p0);
105 }
106
107
108 }
109
110 #else
111 #if defined(ARM_FLOAT16_SUPPORTED)
arm_offset_f16(const float16_t * pSrc,float16_t offset,float16_t * pDst,uint32_t blockSize)112 void arm_offset_f16(
113 const float16_t * pSrc,
114 float16_t offset,
115 float16_t * pDst,
116 uint32_t blockSize)
117 {
118 uint32_t blkCnt; /* Loop counter */
119
120
121 #if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
122
123 /* Loop unrolling: Compute 4 outputs at a time */
124 blkCnt = blockSize >> 2U;
125
126 while (blkCnt > 0U)
127 {
128 /* C = A + offset */
129
130 /* Add offset and store result in destination buffer. */
131 *pDst++ = (*pSrc++) + offset;
132
133 *pDst++ = (*pSrc++) + offset;
134
135 *pDst++ = (*pSrc++) + offset;
136
137 *pDst++ = (*pSrc++) + offset;
138
139 /* Decrement loop counter */
140 blkCnt--;
141 }
142
143 /* Loop unrolling: Compute remaining outputs */
144 blkCnt = blockSize % 0x4U;
145
146 #else
147
148 /* Initialize blkCnt with number of samples */
149 blkCnt = blockSize;
150
151 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
152
153 while (blkCnt > 0U)
154 {
155 /* C = A + offset */
156
157 /* Add offset and store result in destination buffer. */
158 *pDst++ = (*pSrc++) + offset;
159
160 /* Decrement loop counter */
161 blkCnt--;
162 }
163
164 }
165 #endif
166 #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
167
168 /**
169 @} end of BasicOffset group
170 */
171