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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_max_f32.c
1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
10 * Description: Maximum value of a floating-point vector.
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 * ---------------------------------------------------------------------------- */
48 * @defgroup Max Maximum
50 * Computes the maximum value of an array of data.
51 * The function returns both the maximum value and its position within the array.
52 * There are separate functions for floating-point, Q31, Q15, and Q7 data types.
62 * @brief Maximum value of a floating-point vector.
63 * @param[in] *pSrc points to the input vector
64 * @param[in] blockSize length of the input vector
65 * @param[out] *pResult maximum value returned here
66 * @param[out] *pIndex index of maximum value returned here
76 #ifndef ARM_MATH_CM0_FAMILY
78 /* Run the below code for Cortex-M4 and Cortex-M3 */
79 float32_t maxVal1
, maxVal2
, out
; /* Temporary variables to store the output value. */
80 uint32_t blkCnt
, outIndex
, count
; /* loop counter */
82 /* Initialise the count value. */
84 /* Initialise the index value to zero. */
86 /* Load first input value that act as reference value for comparision */
90 blkCnt
= (blockSize
- 1u) >> 2u;
92 /* Run the below code for Cortex-M4 and Cortex-M3 */
95 /* Initialize maxVal to the next consecutive values one by one */
100 /* compare for the maximum value */
103 /* Update the maximum value and its index */
105 outIndex
= count
+ 1u;
110 /* compare for the maximum value */
113 /* Update the maximum value and its index */
115 outIndex
= count
+ 2u;
120 /* compare for the maximum value */
123 /* Update the maximum value and its index */
125 outIndex
= count
+ 3u;
128 /* compare for the maximum value */
131 /* Update the maximum value and its index */
133 outIndex
= count
+ 4u;
138 /* Decrement the loop counter */
142 /* if (blockSize - 1u) is not multiple of 4 */
143 blkCnt
= (blockSize
- 1u) % 4u;
147 /* Run the below code for Cortex-M0 */
148 float32_t maxVal1
, out
; /* Temporary variables to store the output value. */
149 uint32_t blkCnt
, outIndex
; /* loop counter */
151 /* Initialise the index value to zero. */
153 /* Load first input value that act as reference value for comparision */
156 blkCnt
= (blockSize
- 1u);
158 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
162 /* Initialize maxVal to the next consecutive values one by one */
165 /* compare for the maximum value */
168 /* Update the maximum value and it's index */
170 outIndex
= blockSize
- blkCnt
;
174 /* Decrement the loop counter */
179 /* Store the maximum value and it's index into destination pointers */
185 * @} end of Max group