summaryrefslogtreecommitdiff
path: root/midi-dials/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_offset_f32.c
blob: c35fe8e0cd8b890cd5c77f593d68d286300f97fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/* ----------------------------------------------------------------------
 * Project:      CMSIS DSP Library
 * Title:        arm_offset_f32.c
 * Description:  Floating-point vector offset
 *
 * $Date:        27. January 2017
 * $Revision:    V.1.5.1
 *
 * Target Processor: Cortex-M cores
 * -------------------------------------------------------------------- */
/*
 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "arm_math.h"

/**
 * @ingroup groupMath
 */

/**
 * @defgroup offset Vector Offset
 *
 * Adds a constant offset to each element of a vector.
 *
 * <pre>
 *     pDst[n] = pSrc[n] + offset,   0 <= n < blockSize.
 * </pre>
 *
 * The functions support in-place computation allowing the source and
 * destination pointers to reference the same memory buffer.
 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
 */

/**
 * @addtogroup offset
 * @{
 */

/**
 * @brief  Adds a constant offset to a floating-point vector.
 * @param[in]  *pSrc points to the input vector
 * @param[in]  offset is the offset to be added
 * @param[out]  *pDst points to the output vector
 * @param[in]  blockSize number of samples in the vector
 * @return none.
 */


void arm_offset_f32(
  float32_t * pSrc,
  float32_t offset,
  float32_t * pDst,
  uint32_t blockSize)
{
  uint32_t blkCnt;                               /* loop counter */

#if defined (ARM_MATH_DSP)

/* Run the below code for Cortex-M4 and Cortex-M3 */
  float32_t in1, in2, in3, in4;

  /*loop Unrolling */
  blkCnt = blockSize >> 2U;

  /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
   ** a second loop below computes the remaining 1 to 3 samples. */
  while (blkCnt > 0U)
  {
    /* C = A + offset */
    /* Add offset and then store the results in the destination buffer. */
    /* read samples from source */
    in1 = *pSrc;
    in2 = *(pSrc + 1);

    /* add offset to input */
    in1 = in1 + offset;

    /* read samples from source */
    in3 = *(pSrc + 2);

    /* add offset to input */
    in2 = in2 + offset;

    /* read samples from source */
    in4 = *(pSrc + 3);

    /* add offset to input */
    in3 = in3 + offset;

    /* store result to destination */
    *pDst = in1;

    /* add offset to input */
    in4 = in4 + offset;

    /* store result to destination */
    *(pDst + 1) = in2;

    /* store result to destination */
    *(pDst + 2) = in3;

    /* store result to destination */
    *(pDst + 3) = in4;

    /* update pointers to process next samples */
    pSrc += 4U;
    pDst += 4U;

    /* Decrement the loop counter */
    blkCnt--;
  }

  /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
   ** No loop unrolling is used. */
  blkCnt = blockSize % 0x4U;

#else

  /* Run the below code for Cortex-M0 */

  /* Initialize blkCnt with number of samples */
  blkCnt = blockSize;

#endif /* #if defined (ARM_MATH_DSP) */

  while (blkCnt > 0U)
  {
    /* C = A + offset */
    /* Add offset and then store the result in the destination buffer. */
    *pDst++ = (*pSrc++) + offset;

    /* Decrement the loop counter */
    blkCnt--;
  }
}

/**
 * @} end of offset group
 */