| /* ---------------------------------------------------------------------- |
| * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
| * |
| * $Date: 19. March 2015 |
| * $Revision: V.1.4.5 |
| * |
| * Project: CMSIS DSP Library |
| * Title: arm_min_f32.c |
| * |
| * Description: Minimum value of a floating-point vector. |
| * |
| * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * - Neither the name of ARM LIMITED nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * ---------------------------------------------------------------------------- */ |
| |
| #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) |
| { |
| #ifndef ARM_MATH_CM0_FAMILY |
| |
| /* 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 > 0) |
| { |
| /* 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; |
| } |
| |
| minVal1 = *pSrc++; |
| |
| /* compare for the minimum value */ |
| if(out > minVal2) |
| { |
| /* Update the minimum value and its index */ |
| out = minVal2; |
| outIndex = count + 2u; |
| } |
| |
| 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; |
| |
| 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 // #ifndef ARM_MATH_CM0_FAMILY |
| |
| while(blkCnt > 0) |
| { |
| /* 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; |
| } |
| |
| blkCnt--; |
| |
| } |
| |
| /* Store the minimum value and it's index into destination pointers */ |
| *pResult = out; |
| *pIndex = outIndex; |
| } |
| |
| /** |
| * @} end of Min group |
| */ |