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-rw-r--r--Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_absmax_f16.c274
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diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_absmax_f16.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_absmax_f16.c
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+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_absmax_f16.c
+ * Description: Maximum value of a absolute values 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 AbsMax
+ @{
+ */
+
+/**
+ @brief Maximum 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 maximum value returned here
+ @param[out] pIndex index of maximum value returned here
+ @return none
+ */
+
+#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+void arm_absmax_f16(
+ const float16_t * pSrc,
+ uint32_t blockSize,
+ float16_t * pResult,
+ uint32_t * pIndex)
+{
+ uint16_t blkCnt; /* loop counters */
+ f16x8_t vecSrc;
+ float16_t const *pSrcVec;
+ f16x8_t curExtremValVec = vdupq_n_f16(F16_ABSMIN);
+ float16_t maxValue = F16_ABSMIN;
+ uint16_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 > 0U)
+ {
+ vecSrc = vldrhq_f16(pSrcVec);
+ pSrcVec += 8;
+ vecSrc = vabsq(vecSrc);
+ /*
+ * Get current max per lane and current index per lane
+ * when a max is selected
+ */
+ p0 = vcmpgeq(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 > 0U)
+ {
+ vecSrc = vldrhq_f16(pSrcVec);
+ pSrcVec += 8;
+ vecSrc = vabsq(vecSrc);
+
+ p0 = vctp16q(blkCnt);
+ /*
+ * Get current max per lane and current index per lane
+ * when a max is selected
+ */
+ p0 = vcmpgeq_m(vecSrc, curExtremValVec, p0);
+ curExtremValVec = vpselq(vecSrc, curExtremValVec, p0);
+ curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0);
+ }
+ /*
+ * Get max value across the vector
+ */
+ maxValue = vmaxnmvq(maxValue, curExtremValVec);
+ /*
+ * set index for lower values to max possible index
+ */
+ p0 = vcmpgeq(curExtremValVec, maxValue);
+ indexVec = vpselq(curExtremIdxVec, vdupq_n_u16(blockSize), p0);
+ /*
+ * Get min index which is thus for a max value
+ */
+ idx = vminvq(idx, indexVec);
+ /*
+ * Save result
+ */
+ *pIndex = idx;
+ *pResult = maxValue;
+}
+#else
+#if defined(ARM_MATH_LOOPUNROLL)
+void arm_absmax_f16(
+ const float16_t * pSrc,
+ uint32_t blockSize,
+ float16_t * pResult,
+ uint32_t * pIndex)
+{
+ float16_t cur_absmax, out; /* Temporary variables to store the output value. */\
+ uint32_t blkCnt, outIndex; /* Loop counter */ \
+ uint32_t index; /* index of maximum value */ \
+ \
+ /* Initialize index value to zero. */ \
+ outIndex = 0U; \
+ /* Load first input value that act as reference value for comparision */ \
+ out = *pSrc++; \
+ out = ((_Float16)out > 0.0f16) ? out : -(_Float16)out; \
+ /* Initialize index of extrema value. */ \
+ index = 0U; \
+ \
+ /* Loop unrolling: Compute 4 outputs at a time */ \
+ blkCnt = (blockSize - 1U) >> 2U; \
+ \
+ while (blkCnt > 0U) \
+ { \
+ /* Initialize cur_absmax to next consecutive values one by one */ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = ((_Float16)cur_absmax > 0.0f16) ? cur_absmax : -(_Float16)cur_absmax; \
+ /* compare for the extrema value */ \
+ if ((_Float16)cur_absmax > (_Float16)out) \
+ { \
+ /* Update the extrema value and it's index */ \
+ out = cur_absmax; \
+ outIndex = index + 1U; \
+ } \
+ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = ((_Float16)cur_absmax > 0.0f16) ? cur_absmax : -(_Float16)cur_absmax; \
+ if ((_Float16)cur_absmax > (_Float16)out) \
+ { \
+ out = cur_absmax; \
+ outIndex = index + 2U; \
+ } \
+ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = ((_Float16)cur_absmax > 0.0f16) ? cur_absmax : -(_Float16)cur_absmax; \
+ if ((_Float16)cur_absmax > (_Float16)out) \
+ { \
+ out = cur_absmax; \
+ outIndex = index + 3U; \
+ } \
+ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = ((_Float16)cur_absmax > 0.0f16) ? cur_absmax : -(_Float16)cur_absmax; \
+ if ((_Float16)cur_absmax > (_Float16)out) \
+ { \
+ out = cur_absmax; \
+ outIndex = index + 4U; \
+ } \
+ \
+ index += 4U; \
+ \
+ /* Decrement loop counter */ \
+ blkCnt--; \
+ } \
+ \
+ /* Loop unrolling: Compute remaining outputs */ \
+ blkCnt = (blockSize - 1U) % 4U; \
+ \
+ \
+ while (blkCnt > 0U) \
+ { \
+ cur_absmax = *pSrc++; \
+ cur_absmax = ((_Float16)cur_absmax > 0.0f16) ? cur_absmax : -(_Float16)cur_absmax; \
+ if ((_Float16)cur_absmax > (_Float16)out) \
+ { \
+ out = cur_absmax; \
+ outIndex = blockSize - blkCnt; \
+ } \
+ \
+ /* Decrement loop counter */ \
+ blkCnt--; \
+ } \
+ \
+ /* Store the extrema value and it's index into destination pointers */ \
+ *pResult = out; \
+ *pIndex = outIndex;
+}
+#else
+void arm_absmax_f16(
+ const float16_t * pSrc,
+ uint32_t blockSize,
+ float16_t * pResult,
+ uint32_t * pIndex)
+{
+ float16_t maxVal, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex; /* Loop counter */
+
+ /* Initialise index value to zero. */
+ outIndex = 0U;
+
+ /* 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 maxVal to the next consecutive values one by one */
+ maxVal = (_Float16)fabsf((float32_t)*pSrc++);
+
+ /* compare for the maximum value */
+ if ((_Float16)out < (_Float16)maxVal)
+ {
+ /* Update the maximum value and it's index */
+ out = maxVal;
+ outIndex = blockSize - blkCnt;
+ }
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Store the maximum value and it's index into destination pointers */
+ *pResult = out;
+ *pIndex = outIndex;
+}
+#endif /* defined(ARM_MATH_LOOPUNROLL) */
+#endif /* defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) */
+/**
+ @} end of AbsMax group
+ */
+
+#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
+
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