| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_min_f32.c |
| * Description: Minimum value of a floating-point vector |
| * |
| * $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 groupStats |
| */ |
| |
| /** |
| * @defgroup Min Minimum |
| * |
| * Computes the minimum value of an array of data. |
| * The function returns both the minimum value and its position within the array. |
| * There are separate functions for floating-point, Q31, Q15, and Q7 data types. |
| */ |
| |
| /** |
| * @addtogroup Min |
| * @{ |
| */ |
| |
| |
| /** |
| * @brief Minimum value of a floating-point vector. |
| * @param[in] *pSrc points to the input vector |
| * @param[in] blockSize length of the input vector |
| * @param[out] *pResult minimum value returned here |
| * @param[out] *pIndex index of minimum value returned here |
| * @return none. |
| */ |
| |
| void arm_min_f32( |
| float32_t * pSrc, |
| uint32_t blockSize, |
| float32_t * pResult, |
| uint32_t * pIndex) |
| { |
| #if defined (ARM_MATH_DSP) |
| /* Run the below code for Cortex-M4 and Cortex-M3 */ |
| |
| float32_t minVal1, minVal2, out; /* Temporary variables to store the output value. */ |
| uint32_t blkCnt, outIndex, count; /* loop counter */ |
| |
| /* Initialise the count value. */ |
| count = 0U; |
| /* Initialise the index value to zero. */ |
| outIndex = 0U; |
| /* Load first input value that act as reference value for comparision */ |
| out = *pSrc++; |
| |
| /* Loop unrolling */ |
| blkCnt = (blockSize - 1U) >> 2U; |
| |
| while (blkCnt > 0U) |
| { |
| /* Initialize minVal to the next consecutive values one by one */ |
| minVal1 = *pSrc++; |
| minVal2 = *pSrc++; |
| |
| /* compare for the minimum value */ |
| if (out > minVal1) |
| { |
| /* Update the minimum value and its index */ |
| out = minVal1; |
| outIndex = count + 1U; |
| } |
| |
| /* compare for the minimum value */ |
| if (out > minVal2) |
| { |
| /* Update the minimum value and its index */ |
| out = minVal2; |
| outIndex = count + 2U; |
| } |
| |
| /* Initialize minVal to the next consecutive values one by one */ |
| minVal1 = *pSrc++; |
| minVal2 = *pSrc++; |
| |
| /* compare for the minimum value */ |
| if (out > minVal1) |
| { |
| /* Update the minimum value and its index */ |
| out = minVal1; |
| outIndex = count + 3U; |
| } |
| |
| /* compare for the minimum value */ |
| if (out > minVal2) |
| { |
| /* Update the minimum value and its index */ |
| out = minVal2; |
| outIndex = count + 4U; |
| } |
| |
| count += 4U; |
| |
| /* Decrement the loop counter */ |
| blkCnt--; |
| } |
| |
| /* if (blockSize - 1U) is not multiple of 4 */ |
| blkCnt = (blockSize - 1U) % 4U; |
| |
| #else |
| /* Run the below code for Cortex-M0 */ |
| |
| float32_t minVal1, out; /* Temporary variables to store the output value. */ |
| uint32_t blkCnt, outIndex; /* loop counter */ |
| |
| /* Initialise the index value to zero. */ |
| outIndex = 0U; |
| /* Load first input value that act as reference value for comparision */ |
| out = *pSrc++; |
| |
| blkCnt = (blockSize - 1U); |
| |
| #endif /* #if defined (ARM_MATH_DSP) */ |
| |
| while (blkCnt > 0U) |
| { |
| /* Initialize minVal to the next consecutive values one by one */ |
| minVal1 = *pSrc++; |
| |
| /* compare for the minimum value */ |
| if (out > minVal1) |
| { |
| /* Update the minimum value and it's index */ |
| out = minVal1; |
| outIndex = blockSize - blkCnt; |
| } |
| |
| /* Decrement the loop counter */ |
| blkCnt--; |
| } |
| |
| /* Store the minimum value and it's index into destination pointers */ |
| *pResult = out; |
| *pIndex = outIndex; |
| } |
| |
| /** |
| * @} end of Min group |
| */ |