diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c new file mode 100644 index 0000000..41ec12e --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_dot_prod_f32.c @@ -0,0 +1,163 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_dot_prod_f32.c
+ * Description: Floating-point dot product
+ *
+ * $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"
+
+/**
+ @ingroup groupMath
+ */
+
+/**
+ @defgroup BasicDotProd Vector Dot Product
+
+ Computes the dot product of two vectors.
+ The vectors are multiplied element-by-element and then summed.
+
+ <pre>
+ sum = pSrcA[0]*pSrcB[0] + pSrcA[1]*pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1]
+ </pre>
+
+ There are separate functions for floating-point, Q7, Q15, and Q31 data types.
+ */
+
+/**
+ @addtogroup BasicDotProd
+ @{
+ */
+
+/**
+ @brief Dot product of floating-point vectors.
+ @param[in] pSrcA points to the first input vector.
+ @param[in] pSrcB points to the second input vector.
+ @param[in] blockSize number of samples in each vector.
+ @param[out] result output result returned here.
+ @return none
+ */
+
+void arm_dot_prod_f32(
+ const float32_t * pSrcA,
+ const float32_t * pSrcB,
+ uint32_t blockSize,
+ float32_t * result)
+{
+ uint32_t blkCnt; /* Loop counter */
+ float32_t sum = 0.0f; /* Temporary return variable */
+
+#if defined(ARM_MATH_NEON)
+ float32x4_t vec1;
+ float32x4_t vec2;
+ float32x4_t res;
+ float32x4_t accum = vdupq_n_f32(0);
+
+ /* Compute 4 outputs at a time */
+ blkCnt = blockSize >> 2U;
+
+ vec1 = vld1q_f32(pSrcA);
+ vec2 = vld1q_f32(pSrcB);
+
+ while (blkCnt > 0U)
+ {
+ /* C = A[0]*B[0] + A[1]*B[1] + A[2]*B[2] + ... + A[blockSize-1]*B[blockSize-1] */
+ /* Calculate dot product and then store the result in a temporary buffer. */
+
+ accum = vmlaq_f32(accum, vec1, vec2);
+
+ /* Increment pointers */
+ pSrcA += 4;
+ pSrcB += 4;
+
+ vec1 = vld1q_f32(pSrcA);
+ vec2 = vld1q_f32(pSrcB);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+#if __aarch64__
+ sum = vpadds_f32(vpadd_f32(vget_low_f32(accum), vget_high_f32(accum)));
+#else
+ sum = (vpadd_f32(vget_low_f32(accum), vget_high_f32(accum)))[0] + (vpadd_f32(vget_low_f32(accum), vget_high_f32(accum)))[1];
+#endif
+
+ /* Tail */
+ blkCnt = blockSize & 0x3;
+
+#else
+#if defined (ARM_MATH_LOOPUNROLL)
+
+ /* Loop unrolling: Compute 4 outputs at a time */
+ blkCnt = blockSize >> 2U;
+
+ /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
+ ** a second loop below computes the remaining 1 to 3 samples. */
+ while (blkCnt > 0U)
+ {
+ /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
+
+ /* Calculate dot product and store result in a temporary buffer. */
+ sum += (*pSrcA++) * (*pSrcB++);
+
+ sum += (*pSrcA++) * (*pSrcB++);
+
+ sum += (*pSrcA++) * (*pSrcB++);
+
+ sum += (*pSrcA++) * (*pSrcB++);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Loop unrolling: Compute remaining outputs */
+ blkCnt = blockSize % 0x4U;
+
+#else
+
+ /* Initialize blkCnt with number of samples */
+ blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+#endif /* #if defined(ARM_MATH_NEON) */
+
+ while (blkCnt > 0U)
+ {
+ /* C = A[0]* B[0] + A[1]* B[1] + A[2]* B[2] + .....+ A[blockSize-1]* B[blockSize-1] */
+
+ /* Calculate dot product and store result in a temporary buffer. */
+ sum += (*pSrcA++) * (*pSrcB++);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Store result in destination buffer */
+ *result = sum;
+}
+
+/**
+ @} end of BasicDotProd group
+ */
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