diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f32.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f32.c b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f32.c new file mode 100644 index 0000000..f6ffafe --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/StatisticsFunctions/arm_max_f32.c @@ -0,0 +1,271 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_max_f32.c
+ * Description: Maximum value of a floating-point vector
+ *
+ * $Date: 18. March 2019
+ * $Revision: V1.6.0
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2019 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"
+#if defined(ARM_MATH_NEON)
+#include <limits.h>
+#endif
+
+/**
+ @ingroup groupStats
+ */
+
+/**
+ @defgroup Max Maximum
+
+ Computes the maximum value of an array of data.
+ The function returns both the maximum value and its position within the array.
+ There are separate functions for floating-point, Q31, Q15, and Q7 data types.
+ */
+
+/**
+ @addtogroup Max
+ @{
+ */
+
+/**
+ @brief Maximum 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 maximum value returned here
+ @param[out] pIndex index of maximum value returned here
+ @return none
+ */
+#if defined(ARM_MATH_NEON)
+void arm_max_f32(
+ const float32_t * pSrc,
+ uint32_t blockSize,
+ float32_t * pResult,
+ uint32_t * pIndex)
+{
+ float32_t maxVal1, maxVal2, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex, count; /* loop counter */
+
+ float32x4_t outV, srcV;
+ float32x2_t outV2;
+
+ uint32x4_t idxV;
+ uint32x4_t maxIdx={ULONG_MAX,ULONG_MAX,ULONG_MAX,ULONG_MAX};
+ uint32x4_t index={4,5,6,7};
+ uint32x4_t delta={4,4,4,4};
+ uint32x4_t countV={0,1,2,3};
+ uint32x2_t countV2;
+
+ /* Initialise the count value. */
+ count = 0U;
+
+ /* Initialise the index value to zero. */
+ outIndex = 0U;
+
+ /* Load first input value that act as reference value for comparison */
+ if (blockSize <= 3)
+ {
+ out = *pSrc++;
+
+ blkCnt = blockSize - 1;
+
+ while (blkCnt > 0U)
+ {
+ /* Initialize maxVal to the next consecutive values one by one */
+ maxVal1 = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < maxVal1)
+ {
+ /* Update the maximum value and it's index */
+ out = maxVal1;
+ outIndex = blockSize - blkCnt;
+ }
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+ }
+ else
+ {
+ outV = vld1q_f32(pSrc);
+ pSrc += 4;
+
+ /* Compute 4 outputs at a time */
+ blkCnt = (blockSize - 4 ) >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ srcV = vld1q_f32(pSrc);
+ pSrc += 4;
+
+ idxV = vcgtq_f32(srcV, outV);
+ outV = vbslq_f32(idxV, srcV, outV );
+ countV = vbslq_u32(idxV, index,countV );
+
+ index = vaddq_u32(index,delta);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ outV2 = vpmax_f32(vget_low_f32(outV),vget_high_f32(outV));
+ outV2 = vpmax_f32(outV2,outV2);
+ out = outV2[0];
+
+ idxV = vceqq_f32(outV, vdupq_n_f32(out));
+ countV = vbslq_u32(idxV, countV,maxIdx);
+
+ countV2 = vpmin_u32(vget_low_u32(countV),vget_high_u32(countV));
+ countV2 = vpmin_u32(countV2,countV2);
+ outIndex = countV2[0];
+
+ /* if (blockSize - 1U) is not multiple of 4 */
+ blkCnt = (blockSize - 4 ) % 4U;
+
+ while (blkCnt > 0U)
+ {
+ /* Initialize maxVal to the next consecutive values one by one */
+ maxVal1 = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < maxVal1)
+ {
+ /* Update the maximum value and it's index */
+ out = maxVal1;
+ outIndex = blockSize - blkCnt ;
+ }
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+
+ }
+
+ /* Store the maximum value and it's index into destination pointers */
+ *pResult = out;
+ *pIndex = outIndex;
+}
+#else
+void arm_max_f32(
+ const float32_t * pSrc,
+ uint32_t blockSize,
+ float32_t * pResult,
+ uint32_t * pIndex)
+{
+ float32_t maxVal, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex; /* Loop counter */
+
+#if defined (ARM_MATH_LOOPUNROLL)
+ 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)
+ /* Initialise index of maximum value. */
+ index = 0U;
+
+ /* Loop unrolling: Compute 4 outputs at a time */
+ blkCnt = (blockSize - 1U) >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* Initialize maxVal to next consecutive values one by one */
+ maxVal = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < maxVal)
+ {
+ /* Update the maximum value and it's index */
+ out = maxVal;
+ outIndex = index + 1U;
+ }
+
+ maxVal = *pSrc++;
+ if (out < maxVal)
+ {
+ out = maxVal;
+ outIndex = index + 2U;
+ }
+
+ maxVal = *pSrc++;
+ if (out < maxVal)
+ {
+ out = maxVal;
+ outIndex = index + 3U;
+ }
+
+ maxVal = *pSrc++;
+ if (out < maxVal)
+ {
+ out = maxVal;
+ 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 maxVal to the next consecutive values one by one */
+ maxVal = *pSrc++;
+
+ /* compare for the maximum value */
+ if (out < 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 /* #if defined(ARM_MATH_NEON) */
+/**
+ @} end of Max group
+ */
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