|
2
|
1 /* ----------------------------------------------------------------------
|
|
|
2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
|
|
|
3 *
|
|
|
4 * $Date: 19. March 2015
|
|
|
5 * $Revision: V.1.4.5
|
|
|
6 *
|
|
|
7 * Project: CMSIS DSP Library
|
|
|
8 * Title: arm_offset_f32.c
|
|
|
9 *
|
|
|
10 * Description: Floating-point vector offset.
|
|
|
11 *
|
|
|
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
|
|
|
13 *
|
|
|
14 * Redistribution and use in source and binary forms, with or without
|
|
|
15 * modification, are permitted provided that the following conditions
|
|
|
16 * are met:
|
|
|
17 * - Redistributions of source code must retain the above copyright
|
|
|
18 * notice, this list of conditions and the following disclaimer.
|
|
|
19 * - Redistributions in binary form must reproduce the above copyright
|
|
|
20 * notice, this list of conditions and the following disclaimer in
|
|
|
21 * the documentation and/or other materials provided with the
|
|
|
22 * distribution.
|
|
|
23 * - Neither the name of ARM LIMITED nor the names of its contributors
|
|
|
24 * may be used to endorse or promote products derived from this
|
|
|
25 * software without specific prior written permission.
|
|
|
26 *
|
|
|
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
|
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
|
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
|
30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
|
31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
|
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
|
33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
|
34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
|
35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
|
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
|
38 * POSSIBILITY OF SUCH DAMAGE.
|
|
|
39 * ---------------------------------------------------------------------------- */
|
|
|
40 #include "arm_math.h"
|
|
|
41
|
|
|
42 /**
|
|
|
43 * @ingroup groupMath
|
|
|
44 */
|
|
|
45
|
|
|
46 /**
|
|
|
47 * @defgroup offset Vector Offset
|
|
|
48 *
|
|
|
49 * Adds a constant offset to each element of a vector.
|
|
|
50 *
|
|
|
51 * <pre>
|
|
|
52 * pDst[n] = pSrc[n] + offset, 0 <= n < blockSize.
|
|
|
53 * </pre>
|
|
|
54 *
|
|
|
55 * The functions support in-place computation allowing the source and
|
|
|
56 * destination pointers to reference the same memory buffer.
|
|
|
57 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
|
|
|
58 */
|
|
|
59
|
|
|
60 /**
|
|
|
61 * @addtogroup offset
|
|
|
62 * @{
|
|
|
63 */
|
|
|
64
|
|
|
65 /**
|
|
|
66 * @brief Adds a constant offset to a floating-point vector.
|
|
|
67 * @param[in] *pSrc points to the input vector
|
|
|
68 * @param[in] offset is the offset to be added
|
|
|
69 * @param[out] *pDst points to the output vector
|
|
|
70 * @param[in] blockSize number of samples in the vector
|
|
|
71 * @return none.
|
|
|
72 */
|
|
|
73
|
|
|
74
|
|
|
75 void arm_offset_f32(
|
|
|
76 float32_t * pSrc,
|
|
|
77 float32_t offset,
|
|
|
78 float32_t * pDst,
|
|
|
79 uint32_t blockSize)
|
|
|
80 {
|
|
|
81 uint32_t blkCnt; /* loop counter */
|
|
|
82
|
|
|
83 #ifndef ARM_MATH_CM0_FAMILY
|
|
|
84
|
|
|
85 /* Run the below code for Cortex-M4 and Cortex-M3 */
|
|
|
86 float32_t in1, in2, in3, in4;
|
|
|
87
|
|
|
88 /*loop Unrolling */
|
|
|
89 blkCnt = blockSize >> 2u;
|
|
|
90
|
|
|
91 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
|
|
|
92 ** a second loop below computes the remaining 1 to 3 samples. */
|
|
|
93 while(blkCnt > 0u)
|
|
|
94 {
|
|
|
95 /* C = A + offset */
|
|
|
96 /* Add offset and then store the results in the destination buffer. */
|
|
|
97 /* read samples from source */
|
|
|
98 in1 = *pSrc;
|
|
|
99 in2 = *(pSrc + 1);
|
|
|
100
|
|
|
101 /* add offset to input */
|
|
|
102 in1 = in1 + offset;
|
|
|
103
|
|
|
104 /* read samples from source */
|
|
|
105 in3 = *(pSrc + 2);
|
|
|
106
|
|
|
107 /* add offset to input */
|
|
|
108 in2 = in2 + offset;
|
|
|
109
|
|
|
110 /* read samples from source */
|
|
|
111 in4 = *(pSrc + 3);
|
|
|
112
|
|
|
113 /* add offset to input */
|
|
|
114 in3 = in3 + offset;
|
|
|
115
|
|
|
116 /* store result to destination */
|
|
|
117 *pDst = in1;
|
|
|
118
|
|
|
119 /* add offset to input */
|
|
|
120 in4 = in4 + offset;
|
|
|
121
|
|
|
122 /* store result to destination */
|
|
|
123 *(pDst + 1) = in2;
|
|
|
124
|
|
|
125 /* store result to destination */
|
|
|
126 *(pDst + 2) = in3;
|
|
|
127
|
|
|
128 /* store result to destination */
|
|
|
129 *(pDst + 3) = in4;
|
|
|
130
|
|
|
131 /* update pointers to process next samples */
|
|
|
132 pSrc += 4u;
|
|
|
133 pDst += 4u;
|
|
|
134
|
|
|
135 /* Decrement the loop counter */
|
|
|
136 blkCnt--;
|
|
|
137 }
|
|
|
138
|
|
|
139 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
|
|
|
140 ** No loop unrolling is used. */
|
|
|
141 blkCnt = blockSize % 0x4u;
|
|
|
142
|
|
|
143 #else
|
|
|
144
|
|
|
145 /* Run the below code for Cortex-M0 */
|
|
|
146
|
|
|
147 /* Initialize blkCnt with number of samples */
|
|
|
148 blkCnt = blockSize;
|
|
|
149
|
|
|
150 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
|
|
|
151
|
|
|
152 while(blkCnt > 0u)
|
|
|
153 {
|
|
|
154 /* C = A + offset */
|
|
|
155 /* Add offset and then store the result in the destination buffer. */
|
|
|
156 *pDst++ = (*pSrc++) + offset;
|
|
|
157
|
|
|
158 /* Decrement the loop counter */
|
|
|
159 blkCnt--;
|
|
|
160 }
|
|
|
161 }
|
|
|
162
|
|
|
163 /**
|
|
|
164 * @} end of offset group
|
|
|
165 */
|
