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| author | joshua <joshua@joshuayun.com> | 2023-12-30 23:54:31 -0500 |
|---|---|---|
| committer | joshua <joshua@joshuayun.com> | 2023-12-30 23:54:31 -0500 |
| commit | 86608c6770cf08c138a2bdab5855072f64be09ef (patch) | |
| tree | 494a61b3ef37e76f9235a0d10f5c93d97290a35f /Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_f32.c | |
| download | sdr-software-master.tar.gz | |
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_f32.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_f32.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_f32.c new file mode 100644 index 0000000..67556e4 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_sub_f32.c @@ -0,0 +1,148 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_sub_f32.c
+ * Description: Floating-point vector subtraction
+ *
+ * $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 BasicSub Vector Subtraction
+
+ Element-by-element subtraction of two vectors.
+
+ <pre>
+ pDst[n] = pSrcA[n] - pSrcB[n], 0 <= n < blockSize.
+ </pre>
+
+ There are separate functions for floating-point, Q7, Q15, and Q31 data types.
+ */
+
+/**
+ @addtogroup BasicSub
+ @{
+ */
+
+/**
+ @brief Floating-point vector subtraction.
+ @param[in] pSrcA points to the first input vector
+ @param[in] pSrcB points to the second input vector
+ @param[out] pDst points to the output vector
+ @param[in] blockSize number of samples in each vector
+ @return none
+ */
+
+void arm_sub_f32(
+ const float32_t * pSrcA,
+ const float32_t * pSrcB,
+ float32_t * pDst,
+ uint32_t blockSize)
+{
+ uint32_t blkCnt; /* Loop counter */
+
+#if defined(ARM_MATH_NEON)
+ float32x4_t vec1;
+ float32x4_t vec2;
+ float32x4_t res;
+
+ /* Compute 4 outputs at a time */
+ blkCnt = blockSize >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A - B */
+
+ /* Subtract and then store the results in the destination buffer. */
+ vec1 = vld1q_f32(pSrcA);
+ vec2 = vld1q_f32(pSrcB);
+ res = vsubq_f32(vec1, vec2);
+ vst1q_f32(pDst, res);
+
+ /* Increment pointers */
+ pSrcA += 4;
+ pSrcB += 4;
+ pDst += 4;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* Tail */
+ blkCnt = blockSize & 0x3;
+
+#else
+#if defined (ARM_MATH_LOOPUNROLL)
+
+ /* Loop unrolling: Compute 4 outputs at a time */
+ blkCnt = blockSize >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* C = A - B */
+
+ /* Subtract and store result in destination buffer. */
+ *pDst++ = (*pSrcA++) - (*pSrcB++);
+
+ *pDst++ = (*pSrcA++) - (*pSrcB++);
+
+ *pDst++ = (*pSrcA++) - (*pSrcB++);
+
+ *pDst++ = (*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 - B */
+
+ /* Subtract and store result in destination buffer. */
+ *pDst++ = (*pSrcA++) - (*pSrcB++);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+}
+
+/**
+ @} end of BasicSub group
+ */
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