arm_absmin_no_idx_f32.c
1 /* ---------------------------------------------------------------------- 2 * Project: CMSIS DSP Library 3 * Title: arm_absmin_no_idx_f32.c 4 * Description: Minimum value of absolute values of a floating-point vector 5 * 6 * $Date: 16 November 2021 7 * $Revision: V1.10.0 8 * 9 * Target Processor: Cortex-M and Cortex-A cores 10 * -------------------------------------------------------------------- */ 11 /* 12 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved. 13 * 14 * SPDX-License-Identifier: Apache-2.0 15 * 16 * Licensed under the Apache License, Version 2.0 (the License); you may 17 * not use this file except in compliance with the License. 18 * You may obtain a copy of the License at 19 * 20 * www.apache.org/licenses/LICENSE-2.0 21 * 22 * Unless required by applicable law or agreed to in writing, software 23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT 24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 25 * See the License for the specific language governing permissions and 26 * limitations under the License. 27 */ 28 29 #include "dsp/statistics_functions.h" 30 31 #if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE) 32 #include <limits.h> 33 #endif 34 35 36 /** 37 @ingroup groupStats 38 */ 39 40 41 /** 42 @addtogroup AbsMin 43 @{ 44 */ 45 46 /** 47 @brief Minimum value of absolute values of a floating-point vector. 48 @param[in] pSrc points to the input vector 49 @param[in] blockSize number of samples in input vector 50 @param[out] pResult minimum value returned here 51 @return none 52 */ 53 54 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) 55 56 #include "arm_helium_utils.h" 57 void arm_absmin_no_idx_f32( 58 const float32_t * pSrc, 59 uint32_t blockSize, 60 float32_t * pResult) 61 { 62 int32_t blkCnt; /* loop counters */ 63 f32x4_t vecSrc; 64 float32_t const *pSrcVec; 65 f32x4_t curExtremValVec = vdupq_n_f32(F32_ABSMAX); 66 float32_t minValue = F32_ABSMAX; 67 mve_pred16_t p0; 68 69 70 pSrcVec = (float32_t const *) pSrc; 71 blkCnt = blockSize >> 2; 72 while (blkCnt > 0) 73 { 74 vecSrc = vldrwq_f32(pSrcVec); 75 pSrcVec += 4; 76 /* 77 * update per-lane min. 78 */ 79 curExtremValVec = vminnmaq(vecSrc, curExtremValVec); 80 /* 81 * Decrement the blockSize loop counter 82 */ 83 blkCnt--; 84 } 85 /* 86 * tail 87 * (will be merged thru tail predication) 88 */ 89 blkCnt = blockSize & 3; 90 if (blkCnt > 0) 91 { 92 vecSrc = vldrwq_f32(pSrcVec); 93 pSrcVec += 4; 94 p0 = vctp32q(blkCnt); 95 /* 96 * Get current min per lane and current index per lane 97 * when a min is selected 98 */ 99 curExtremValVec = vminnmaq_m(curExtremValVec, vecSrc, p0); 100 } 101 /* 102 * Get min value across the vector 103 */ 104 minValue = vminnmavq(minValue, curExtremValVec); 105 *pResult = minValue; 106 } 107 108 #else 109 #if defined(ARM_MATH_LOOPUNROLL) 110 void arm_absmin_no_idx_f32( 111 const float32_t * pSrc, 112 uint32_t blockSize, 113 float32_t * pResult) 114 { 115 float32_t cur_absmin, out; /* Temporary variables to store the output value. */\ 116 uint32_t blkCnt; /* Loop counter */ \ 117 \ 118 \ 119 /* Load first input value that act as reference value for comparision */ \ 120 out = *pSrc++; \ 121 out = (out > 0.0f) ? out : -out; \ 122 \ 123 \ 124 /* Loop unrolling: Compute 4 outputs at a time */ \ 125 blkCnt = (blockSize - 1U) >> 2U; \ 126 \ 127 while (blkCnt > 0U) \ 128 { \ 129 /* Initialize cur_absmin to next consecutive values one by one */ \ 130 cur_absmin = *pSrc++; \ 131 cur_absmin = (cur_absmin > 0.0f) ? cur_absmin : -cur_absmin; \ 132 /* compare for the extrema value */ \ 133 if (cur_absmin < out) \ 134 { \ 135 /* Update the extrema value and it's index */ \ 136 out = cur_absmin; \ 137 } \ 138 \ 139 cur_absmin = *pSrc++; \ 140 cur_absmin = (cur_absmin > 0.0f) ? cur_absmin : -cur_absmin; \ 141 if (cur_absmin < out) \ 142 { \ 143 out = cur_absmin; \ 144 } \ 145 \ 146 cur_absmin = *pSrc++; \ 147 cur_absmin = (cur_absmin > 0.0f) ? cur_absmin : -cur_absmin; \ 148 if (cur_absmin < out) \ 149 { \ 150 out = cur_absmin; \ 151 } \ 152 \ 153 cur_absmin = *pSrc++; \ 154 cur_absmin = (cur_absmin > 0.0f) ? cur_absmin : -cur_absmin; \ 155 if (cur_absmin < out) \ 156 { \ 157 out = cur_absmin; \ 158 } \ 159 \ 160 \ 161 /* Decrement loop counter */ \ 162 blkCnt--; \ 163 } \ 164 \ 165 /* Loop unrolling: Compute remaining outputs */ \ 166 blkCnt = (blockSize - 1U) % 4U; \ 167 \ 168 \ 169 while (blkCnt > 0U) \ 170 { \ 171 cur_absmin = *pSrc++; \ 172 cur_absmin = (cur_absmin > 0.0f) ? cur_absmin : -cur_absmin; \ 173 if (cur_absmin < out) \ 174 { \ 175 out = cur_absmin; \ 176 } \ 177 \ 178 /* Decrement loop counter */ \ 179 blkCnt--; \ 180 } \ 181 \ 182 /* Store the extrema value and it's index into destination pointers */ \ 183 *pResult = out; \ 184 } 185 #else 186 void arm_absmin_no_idx_f32( 187 const float32_t * pSrc, 188 uint32_t blockSize, 189 float32_t * pResult) 190 { 191 float32_t minVal, out; /* Temporary variables to store the output value. */ 192 uint32_t blkCnt; /* Loop counter */ 193 194 195 196 /* Load first input value that act as reference value for comparision */ 197 out = fabsf(*pSrc++); 198 199 /* Initialize blkCnt with number of samples */ 200 blkCnt = (blockSize - 1U); 201 202 while (blkCnt > 0U) 203 { 204 /* Initialize minVal to the next consecutive values one by one */ 205 minVal = fabsf(*pSrc++); 206 207 /* compare for the minimum value */ 208 if (out > minVal) 209 { 210 /* Update the minimum value and it's index */ 211 out = minVal; 212 } 213 214 /* Decrement loop counter */ 215 blkCnt--; 216 } 217 218 /* Store the minimum value and it's index into destination pointers */ 219 *pResult = out; 220 } 221 222 #endif /* defined(ARM_MATH_LOOPUNROLL) */ 223 #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ 224 /** 225 @} end of AbsMin group 226 */