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| 8b51c7 | 1 | /* ---------------------------------------------------------------------- |
| Q | 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_min_q7.c | |
| 9 | * | |
| 10 | * Description: Minimum value of a Q7 vector. | |
| 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 | ||
| 41 | #include "arm_math.h" | |
| 42 | ||
| 43 | /** | |
| 44 | * @ingroup groupStats | |
| 45 | */ | |
| 46 | ||
| 47 | /** | |
| 48 | * @addtogroup Min | |
| 49 | * @{ | |
| 50 | */ | |
| 51 | ||
| 52 | ||
| 53 | /** | |
| 54 | * @brief Minimum value of a Q7 vector. | |
| 55 | * @param[in] *pSrc points to the input vector | |
| 56 | * @param[in] blockSize length of the input vector | |
| 57 | * @param[out] *pResult minimum value returned here | |
| 58 | * @param[out] *pIndex index of minimum value returned here | |
| 59 | * @return none. | |
| 60 | * | |
| 61 | */ | |
| 62 | ||
| 63 | void arm_min_q7( | |
| 64 | q7_t * pSrc, | |
| 65 | uint32_t blockSize, | |
| 66 | q7_t * pResult, | |
| 67 | uint32_t * pIndex) | |
| 68 | { | |
| 69 | #ifndef ARM_MATH_CM0_FAMILY | |
| 70 | ||
| 71 | /* Run the below code for Cortex-M4 and Cortex-M3 */ | |
| 72 | ||
| 73 | q7_t minVal1, minVal2, out; /* Temporary variables to store the output value. */ | |
| 74 | uint32_t blkCnt, outIndex, count; /* loop counter */ | |
| 75 | ||
| 76 | /* Initialise the count value. */ | |
| 77 | count = 0u; | |
| 78 | /* Initialise the index value to zero. */ | |
| 79 | outIndex = 0u; | |
| 80 | /* Load first input value that act as reference value for comparision */ | |
| 81 | out = *pSrc++; | |
| 82 | ||
| 83 | /* Loop unrolling */ | |
| 84 | blkCnt = (blockSize - 1u) >> 2u; | |
| 85 | ||
| 86 | while(blkCnt > 0) | |
| 87 | { | |
| 88 | /* Initialize minVal to the next consecutive values one by one */ | |
| 89 | minVal1 = *pSrc++; | |
| 90 | minVal2 = *pSrc++; | |
| 91 | ||
| 92 | /* compare for the minimum value */ | |
| 93 | if(out > minVal1) | |
| 94 | { | |
| 95 | /* Update the minimum value and its index */ | |
| 96 | out = minVal1; | |
| 97 | outIndex = count + 1u; | |
| 98 | } | |
| 99 | ||
| 100 | minVal1 = *pSrc++; | |
| 101 | ||
| 102 | /* compare for the minimum value */ | |
| 103 | if(out > minVal2) | |
| 104 | { | |
| 105 | /* Update the minimum value and its index */ | |
| 106 | out = minVal2; | |
| 107 | outIndex = count + 2u; | |
| 108 | } | |
| 109 | ||
| 110 | minVal2 = *pSrc++; | |
| 111 | ||
| 112 | /* compare for the minimum value */ | |
| 113 | if(out > minVal1) | |
| 114 | { | |
| 115 | /* Update the minimum value and its index */ | |
| 116 | out = minVal1; | |
| 117 | outIndex = count + 3u; | |
| 118 | } | |
| 119 | ||
| 120 | /* compare for the minimum value */ | |
| 121 | if(out > minVal2) | |
| 122 | { | |
| 123 | /* Update the minimum value and its index */ | |
| 124 | out = minVal2; | |
| 125 | outIndex = count + 4u; | |
| 126 | } | |
| 127 | ||
| 128 | count += 4u; | |
| 129 | ||
| 130 | blkCnt--; | |
| 131 | } | |
| 132 | ||
| 133 | /* if (blockSize - 1u ) is not multiple of 4 */ | |
| 134 | blkCnt = (blockSize - 1u) % 4u; | |
| 135 | ||
| 136 | #else | |
| 137 | ||
| 138 | /* Run the below code for Cortex-M0 */ | |
| 139 | ||
| 140 | q7_t minVal1, out; /* Temporary variables to store the output value. */ | |
| 141 | uint32_t blkCnt, outIndex; /* loop counter */ | |
| 142 | ||
| 143 | /* Initialise the index value to zero. */ | |
| 144 | outIndex = 0u; | |
| 145 | /* Load first input value that act as reference value for comparision */ | |
| 146 | out = *pSrc++; | |
| 147 | ||
| 148 | blkCnt = (blockSize - 1u); | |
| 149 | ||
| 150 | #endif // #ifndef ARM_MATH_CM0_FAMILY | |
| 151 | ||
| 152 | while(blkCnt > 0) | |
| 153 | { | |
| 154 | /* Initialize minVal to the next consecutive values one by one */ | |
| 155 | minVal1 = *pSrc++; | |
| 156 | ||
| 157 | /* compare for the minimum value */ | |
| 158 | if(out > minVal1) | |
| 159 | { | |
| 160 | /* Update the minimum value and it's index */ | |
| 161 | out = minVal1; | |
| 162 | outIndex = blockSize - blkCnt; | |
| 163 | } | |
| 164 | ||
| 165 | blkCnt--; | |
| 166 | ||
| 167 | } | |
| 168 | ||
| 169 | /* Store the minimum value and its index into destination pointers */ | |
| 170 | *pResult = out; | |
| 171 | *pIndex = outIndex; | |
| 172 | ||
| 173 | ||
| 174 | } | |
| 175 | ||
| 176 | /** | |
| 177 | * @} end of Min group | |
| 178 | */ | |
