1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
8 * Title: arm_offset_f32.c
10 * Description: Floating-point vector offset.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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
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.
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 * ---------------------------------------------------------------------------- */
47 * @defgroup offset Vector Offset
49 * Adds a constant offset to each element of a vector.
52 * pDst[n] = pSrc[n] + offset, 0 <= n < blockSize.
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.
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
81 uint32_t blkCnt; /* loop counter */
83 #ifndef ARM_MATH_CM0_FAMILY
85 /* Run the below code for Cortex-M4 and Cortex-M3 */
86 float32_t in1, in2, in3, in4;
89 blkCnt = blockSize >> 2u;
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. */
96 /* Add offset and then store the results in the destination buffer. */
97 /* read samples from source */
101 /* add offset to input */
104 /* read samples from source */
107 /* add offset to input */
110 /* read samples from source */
113 /* add offset to input */
116 /* store result to destination */
119 /* add offset to input */
122 /* store result to destination */
125 /* store result to destination */
128 /* store result to destination */
131 /* update pointers to process next samples */
135 /* Decrement the loop counter */
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;
145 /* Run the below code for Cortex-M0 */
147 /* Initialize blkCnt with number of samples */
150 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
155 /* Add offset and then store the result in the destination buffer. */
156 *pDst++ = (*pSrc++) + offset;
158 /* Decrement the loop counter */
164 * @} end of offset group