1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_abs_f16.c
4 * Description: Floating-point vector absolute value
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 #include <math.h>
31
32 /**
33 @ingroup groupMath
34 */
35
36 /**
37 @defgroup BasicAbs Vector Absolute Value
38
39 Computes the absolute value of a vector on an element-by-element basis.
40
41 <pre>
42 pDst[n] = abs(pSrc[n]), 0 <= n < blockSize.
43 </pre>
44
45 The functions support in-place computation allowing the source and
46 destination pointers to reference the same memory buffer.
47 There are separate functions for floating-point, Q7, Q15, and Q31 data types.
48 */
49
50 /**
51 @addtogroup BasicAbs
52 @{
53 */
54
55 /**
56 @brief Floating-point vector absolute value.
57 @param[in] pSrc points to the input vector
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
64 #if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
65
66 #include "arm_helium_utils.h"
67
arm_abs_f16(const float16_t * pSrc,float16_t * pDst,uint32_t blockSize)68 void arm_abs_f16(
69 const float16_t * pSrc,
70 float16_t * pDst,
71 uint32_t blockSize)
72 {
73 uint32_t blkCnt; /* Loop counter */
74 f16x8_t vec1;
75 f16x8_t res;
76
77
78 /* Compute 4 outputs at a time */
79 blkCnt = blockSize >> 3U;
80
81 while (blkCnt > 0U)
82 {
83 /* C = |A| */
84
85 /* Calculate absolute values and then store the results in the destination buffer. */
86 vec1 = vld1q(pSrc);
87 res = vabsq(vec1);
88 vst1q(pDst, res);
89
90 /* Increment pointers */
91 pSrc += 8;
92 pDst += 8;
93
94 /* Decrement the loop counter */
95 blkCnt--;
96 }
97
98 /* Tail */
99 blkCnt = blockSize & 0x7;
100
101
102 if (blkCnt > 0U)
103 {
104 /* C = |A| */
105 mve_pred16_t p0 = vctp16q(blkCnt);
106 vec1 = vld1q(pSrc);
107 vstrhq_p(pDst, vabsq(vec1), p0);
108 }
109
110 }
111
112 #else
113 #if defined(ARM_FLOAT16_SUPPORTED)
arm_abs_f16(const float16_t * pSrc,float16_t * pDst,uint32_t blockSize)114 void arm_abs_f16(
115 const float16_t * pSrc,
116 float16_t * pDst,
117 uint32_t blockSize)
118 {
119 uint32_t blkCnt; /* Loop counter */
120
121 #if defined(ARM_MATH_NEON_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
122 f16x8_t vec1;
123 f16x8_t res;
124
125 /* Compute 4 outputs at a time */
126 blkCnt = blockSize >> 2U;
127
128 while (blkCnt > 0U)
129 {
130 /* C = |A| */
131
132 /* Calculate absolute values and then store the results in the destination buffer. */
133 vec1 = vld1q_f16(pSrc);
134 res = vabsq_f16(vec1);
135 vst1q_f16(pDst, res);
136
137 /* Increment pointers */
138 pSrc += 4;
139 pDst += 4;
140
141 /* Decrement the loop counter */
142 blkCnt--;
143 }
144
145 /* Tail */
146 blkCnt = blockSize & 0x3;
147
148 #else
149 #if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
150
151 /* Loop unrolling: Compute 4 outputs at a time */
152 blkCnt = blockSize >> 2U;
153
154 while (blkCnt > 0U)
155 {
156 /* C = |A| */
157
158 /* Calculate absolute and store result in destination buffer. */
159 *pDst++ = fabsf(*pSrc++);
160
161 *pDst++ = fabsf(*pSrc++);
162
163 *pDst++ = fabsf(*pSrc++);
164
165 *pDst++ = fabsf(*pSrc++);
166
167 /* Decrement loop counter */
168 blkCnt--;
169 }
170
171 /* Loop unrolling: Compute remaining outputs */
172 blkCnt = blockSize % 0x4U;
173
174 #else
175
176 /* Initialize blkCnt with number of samples */
177 blkCnt = blockSize;
178
179 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
180 #endif /* #if defined(ARM_MATH_NEON) */
181
182 while (blkCnt > 0U)
183 {
184 /* C = |A| */
185
186 /* Calculate absolute and store result in destination buffer. */
187 *pDst++ = fabsf(*pSrc++);
188
189 /* Decrement loop counter */
190 blkCnt--;
191 }
192
193 }
194 #endif /* defined(ARM_FLOAT16_SUPPORTED */
195 #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
196 /**
197 @} end of BasicAbs group
198 */
199