/* ---------------------------------------------------------------------- * Project: CMSIS DSP Library * Title: arm_absmin_no_idx_f16.c * Description: Minimum value of absolute values of a floating-point vector * * $Date: 16 November 2021 * $Revision: V1.10.0 * * 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 #endif /** @ingroup groupStats */ /** @addtogroup AbsMin @{ */ /** @brief Minimum value of absolute values 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 @return none */ #if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) #include "arm_helium_utils.h" void arm_absmin_no_idx_f16( const float16_t * pSrc, uint32_t blockSize, float16_t * pResult) { int32_t blkCnt; /* loop counters */ f16x8_t vecSrc; float16_t const *pSrcVec; f16x8_t curExtremValVec = vdupq_n_f16(F16_ABSMAX); float16_t minValue = F16_ABSMAX; mve_pred16_t p0; pSrcVec = (float16_t const *) pSrc; blkCnt = blockSize >> 3; while (blkCnt > 0) { vecSrc = vld1q(pSrcVec); pSrcVec += 8; /* * update per-lane min. */ curExtremValVec = vminnmaq(vecSrc, curExtremValVec); /* * Decrement the blockSize loop counter */ blkCnt--; } /* * tail * (will be merged thru tail predication) */ blkCnt = blockSize & 7; if (blkCnt > 0) { vecSrc = vld1q(pSrcVec); pSrcVec += 8; p0 = vctp16q(blkCnt); /* * Get current min per lane and current index per lane * when a min is selected */ curExtremValVec = vminnmaq_m(curExtremValVec, vecSrc, p0); } /* * Get min value across the vector */ minValue = vminnmavq(minValue, curExtremValVec); *pResult = minValue; } #else #if defined(ARM_MATH_LOOPUNROLL) void arm_absmin_no_idx_f16( const float16_t * pSrc, uint32_t blockSize, float16_t * pResult) { float16_t cur_absmin, out; /* Temporary variables to store the output value. */\ uint32_t blkCnt; /* Loop counter */ \ \ \ /* Load first input value that act as reference value for comparision */ \ out = *pSrc++; \ out = ((_Float16)out > 0.0f16) ? out : -(_Float16)out; \ \ \ /* Loop unrolling: Compute 4 outputs at a time */ \ blkCnt = (blockSize - 1U) >> 2U; \ \ while (blkCnt > 0U) \ { \ /* Initialize cur_absmin to next consecutive values one by one */ \ cur_absmin = *pSrc++; \ cur_absmin = ((_Float16)cur_absmin > 0.0f16) ? cur_absmin : -(_Float16)cur_absmin; \ /* compare for the extrema value */ \ if ((_Float16)cur_absmin < (_Float16)out) \ { \ /* Update the extrema value and it's index */ \ out = cur_absmin; \ } \ \ cur_absmin = *pSrc++; \ cur_absmin = ((_Float16)cur_absmin > 0.0f16) ? cur_absmin : -(_Float16)cur_absmin; \ if ((_Float16)cur_absmin < (_Float16)out) \ { \ out = cur_absmin; \ } \ \ cur_absmin = *pSrc++; \ cur_absmin = ((_Float16)cur_absmin > 0.0f16) ? cur_absmin : -(_Float16)cur_absmin; \ if ((_Float16)cur_absmin < (_Float16)out) \ { \ out = cur_absmin; \ } \ \ cur_absmin = *pSrc++; \ cur_absmin = ((_Float16)cur_absmin > 0.0f16) ? cur_absmin : -(_Float16)cur_absmin; \ if ((_Float16)cur_absmin < (_Float16)out) \ { \ out = cur_absmin; \ } \ \ \ /* Decrement loop counter */ \ blkCnt--; \ } \ \ /* Loop unrolling: Compute remaining outputs */ \ blkCnt = (blockSize - 1U) % 4U; \ \ \ while (blkCnt > 0U) \ { \ cur_absmin = *pSrc++; \ cur_absmin = ((_Float16)cur_absmin > 0.0f16) ? cur_absmin : -(_Float16)cur_absmin; \ if ((_Float16)cur_absmin < (_Float16)out) \ { \ out = cur_absmin; \ } \ \ /* Decrement loop counter */ \ blkCnt--; \ } \ \ /* Store the extrema value and it's index into destination pointers */ \ *pResult = out; \ } #else void arm_absmin_no_idx_f16( const float16_t * pSrc, uint32_t blockSize, float16_t * pResult) { float16_t minVal, out; /* Temporary variables to store the output value. */ uint32_t blkCnt; /* Loop counter */ /* Load first input value that act as reference value for comparision */ out = (_Float16)fabsf((float32_t)*pSrc++); /* Initialize blkCnt with number of samples */ blkCnt = (blockSize - 1U); while (blkCnt > 0U) { /* Initialize minVal to the next consecutive values one by one */ minVal = (_Float16)fabsf((float32_t)*pSrc++); /* compare for the minimum value */ if ((_Float16)out > (_Float16)minVal) { /* Update the minimum value and it's index */ out = minVal; } /* Decrement loop counter */ blkCnt--; } /* Store the minimum value and it's index into destination pointers */ *pResult = out; } #endif /* defined(ARM_MATH_LOOPUNROLL) */ #endif /* defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) */ /** @} end of AbsMin group */ #endif /* #if defined(ARM_FLOAT16_SUPPORTED) */