diff options
author | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
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committer | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
commit | 5b81bc8ccbd342b8566d88fc9f17a73aec03b5b6 (patch) | |
tree | cc57486912cfa74c6440d8b97c28f451ec787d78 /Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_f16.c |
initial commit
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_f16.c')
-rw-r--r-- | Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_f16.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_f16.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_f16.c new file mode 100644 index 0000000..3ff9db4 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_min_f16.c @@ -0,0 +1,240 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_min_f16.c + * Description: Minimum value of a floating-point vector + * + * $Date: 23 April 2021 + * $Revision: V1.9.0 + * + * Target Processor: Cortex-M and Cortex-A cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2021 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 "dsp/statistics_functions_f16.h" + +#if defined(ARM_FLOAT16_SUPPORTED) + + +#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE) +#include <limits.h> +#endif + + +/** + @ingroup groupStats + */ + +/** + @addtogroup Min + @{ + */ + +/** + @brief Minimum value of a floating-point vector. + @param[in] pSrc points to the input vector + @param[in] blockSize number of samples in input vector + @param[out] pResult minimum value returned here + @param[out] pIndex index of minimum value returned here + @return none + */ + +#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) + +void arm_min_f16( + const float16_t * pSrc, + uint32_t blockSize, + float16_t * pResult, + uint32_t * pIndex) +{ + int32_t blkCnt; /* loop counters */ + f16x8_t vecSrc; + float16_t const *pSrcVec; + f16x8_t curExtremValVec = vdupq_n_f16(F16_MAX); + float16_t minValue = F16_MAX; + uint32_t idx = blockSize; + uint16x8_t indexVec; + uint16x8_t curExtremIdxVec; + mve_pred16_t p0; + + indexVec = vidupq_u16((uint32_t)0, 1); + curExtremIdxVec = vdupq_n_u16(0); + + pSrcVec = (float16_t const *) pSrc; + blkCnt = blockSize >> 3; + while (blkCnt > 0) + { + vecSrc = vldrhq_f16(pSrcVec); pSrcVec += 8; + /* + * Get current min per lane and current index per lane + * when a min is selected + */ + p0 = vcmpleq(vecSrc, curExtremValVec); + curExtremValVec = vpselq(vecSrc, curExtremValVec, p0); + curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0); + + indexVec = indexVec + 8; + /* + * Decrement the blockSize loop counter + */ + blkCnt--; + } + /* + * tail + * (will be merged thru tail predication) + */ + blkCnt = blockSize & 7; + if (blkCnt > 0) + { + vecSrc = vldrhq_f16(pSrcVec); pSrcVec += 8; + p0 = vctp16q(blkCnt); + /* + * Get current min per lane and current index per lane + * when a min is selected + */ + p0 = vcmpleq_m(vecSrc, curExtremValVec, p0); + curExtremValVec = vpselq(vecSrc, curExtremValVec, p0); + curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0); + } + /* + * Get min value across the vector + */ + minValue = vminnmvq(minValue, curExtremValVec); + /* + * set index for lower values to min possible index + */ + p0 = vcmpleq(curExtremValVec, minValue); + indexVec = vpselq(curExtremIdxVec, vdupq_n_u16(blockSize), p0); + /* + * Get min index which is thus for a min value + */ + idx = vminvq(idx, indexVec); + /* + * Save result + */ + *pIndex = idx; + *pResult = minValue; +} + +#else + +void arm_min_f16( + const float16_t * pSrc, + uint32_t blockSize, + float16_t * pResult, + uint32_t * pIndex) +{ + float16_t minVal, out; /* Temporary variables to store the output value. */ + uint32_t blkCnt, outIndex; /* Loop counter */ + +#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE) + uint32_t index; /* index of maximum value */ +#endif + + /* Initialise index value to zero. */ + outIndex = 0U; + + /* Load first input value that act as reference value for comparision */ + out = *pSrc++; + +#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE) + /* Initialise index of maximum value. */ + index = 0U; + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = (blockSize - 1U) >> 2U; + + while (blkCnt > 0U) + { + /* Initialize minVal to next consecutive values one by one */ + minVal = *pSrc++; + + /* compare for the minimum value */ + if ((_Float16)out > (_Float16)minVal) + { + /* Update the minimum value and it's index */ + out = minVal; + outIndex = index + 1U; + } + + minVal = *pSrc++; + if ((_Float16)out > (_Float16)minVal) + { + out = minVal; + outIndex = index + 2U; + } + + minVal = *pSrc++; + if ((_Float16)out > (_Float16)minVal) + { + out = minVal; + outIndex = index + 3U; + } + + minVal = *pSrc++; + if ((_Float16)out > (_Float16)minVal) + { + out = minVal; + outIndex = index + 4U; + } + + index += 4U; + + /* Decrement loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = (blockSize - 1U) % 4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = (blockSize - 1U); + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* Initialize minVal to the next consecutive values one by one */ + minVal = *pSrc++; + + /* compare for the minimum value */ + if ((_Float16)out > (_Float16)minVal) + { + /* Update the minimum value and it's index */ + out = minVal; + outIndex = blockSize - blkCnt; + } + + /* Decrement loop counter */ + blkCnt--; + } + + /* Store the minimum value and it's index into destination pointers */ + *pResult = out; + *pIndex = outIndex; +} +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + +/** + @} end of Min group + */ + +#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ + |