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+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_mat_sub_f32.c
+ * Description: Floating-point matrix subtraction
+ *
+ * $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/matrix_functions.h"
+
+/**
+ @ingroup groupMatrix
+ */
+
+/**
+ @defgroup MatrixSub Matrix Subtraction
+
+ Subtract two matrices.
+ \image html MatrixSubtraction.gif "Subraction of two 3 x 3 matrices"
+
+ The functions check to make sure that
+ <code>pSrcA</code>, <code>pSrcB</code>, and <code>pDst</code> have the same
+ number of rows and columns.
+ */
+
+/**
+ @addtogroup MatrixSub
+ @{
+ */
+
+/**
+ @brief Floating-point matrix subtraction.
+ @param[in] pSrcA points to the first input matrix structure
+ @param[in] pSrcB points to the second input matrix structure
+ @param[out] pDst points to output matrix structure
+ @return execution status
+ - \ref ARM_MATH_SUCCESS : Operation successful
+ - \ref ARM_MATH_SIZE_MISMATCH : Matrix size check failed
+ */
+#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
+arm_status arm_mat_sub_f32(
+ const arm_matrix_instance_f32 * pSrcA,
+ const arm_matrix_instance_f32 * pSrcB,
+ arm_matrix_instance_f32 * pDst)
+{
+ arm_status status; /* status of matrix subtraction */
+ uint32_t numSamples; /* total number of elements in the matrix */
+ float32_t *pDataA, *pDataB, *pDataDst;
+ f32x4_t vecA, vecB, vecDst;
+ float32_t const *pSrcAVec;
+ float32_t const *pSrcBVec;
+ uint32_t blkCnt; /* loop counters */
+
+ pDataA = pSrcA->pData;
+ pDataB = pSrcB->pData;
+ pDataDst = pDst->pData;
+ pSrcAVec = (float32_t const *) pDataA;
+ pSrcBVec = (float32_t const *) pDataB;
+
+#ifdef ARM_MATH_MATRIX_CHECK
+ /* Check for matrix mismatch condition */
+ if ((pSrcA->numRows != pSrcB->numRows) ||
+ (pSrcA->numCols != pSrcB->numCols) ||
+ (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
+ {
+ /* Set status as ARM_MATH_SIZE_MISMATCH */
+ status = ARM_MATH_SIZE_MISMATCH;
+ }
+ else
+#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
+ {
+ /*
+ * Total number of samples in the input matrix
+ */
+ numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
+ blkCnt = numSamples >> 2;
+ while (blkCnt > 0U)
+ {
+ /* C(m,n) = A(m,n) + B(m,n) */
+ /* sub and then store the results in the destination buffer. */
+ vecA = vld1q(pSrcAVec);
+ pSrcAVec += 4;
+ vecB = vld1q(pSrcBVec);
+ pSrcBVec += 4;
+ vecDst = vsubq(vecA, vecB);
+ vst1q(pDataDst, vecDst);
+ pDataDst += 4;
+ /*
+ * Decrement the blockSize loop counter
+ */
+ blkCnt--;
+ }
+ /*
+ * tail
+ * (will be merged thru tail predication)
+ */
+ blkCnt = numSamples & 3;
+ if (blkCnt > 0U)
+ {
+ mve_pred16_t p0 = vctp32q(blkCnt);
+ vecA = vld1q(pSrcAVec);
+ vecB = vld1q(pSrcBVec);
+ vecDst = vsubq_m(vecDst, vecA, vecB, p0);
+ vstrwq_p(pDataDst, vecDst, p0);
+ }
+ status = ARM_MATH_SUCCESS;
+ }
+
+ /* Return to application */
+ return (status);
+}
+
+#else
+#if defined(ARM_MATH_NEON)
+arm_status arm_mat_sub_f32(
+ const arm_matrix_instance_f32 * pSrcA,
+ const arm_matrix_instance_f32 * pSrcB,
+ arm_matrix_instance_f32 * pDst)
+{
+ float32_t *pIn1 = pSrcA->pData; /* input data matrix pointer A */
+ float32_t *pIn2 = pSrcB->pData; /* input data matrix pointer B */
+ float32_t *pOut = pDst->pData; /* output data matrix pointer */
+
+
+ uint32_t numSamples; /* total number of elements in the matrix */
+ uint32_t blkCnt; /* loop counters */
+ arm_status status; /* status of matrix subtraction */
+
+#ifdef ARM_MATH_MATRIX_CHECK
+ /* Check for matrix mismatch condition */
+ if ((pSrcA->numRows != pSrcB->numRows) ||
+ (pSrcA->numCols != pSrcB->numCols) ||
+ (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols))
+ {
+ /* Set status as ARM_MATH_SIZE_MISMATCH */
+ status = ARM_MATH_SIZE_MISMATCH;
+ }
+ else
+#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
+ {
+ float32x4_t vec1;
+ float32x4_t vec2;
+ float32x4_t res;
+
+ /* Total number of samples in the input matrix */
+ numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
+
+ blkCnt = numSamples >> 2U;
+
+ /* Compute 4 outputs at a time.
+ ** a second loop below computes the remaining 1 to 3 samples. */
+ while (blkCnt > 0U)
+ {
+ /* C(m,n) = A(m,n) - B(m,n) */
+ /* Subtract and then store the results in the destination buffer. */
+ /* Read values from source A */
+ vec1 = vld1q_f32(pIn1);
+ vec2 = vld1q_f32(pIn2);
+ res = vsubq_f32(vec1, vec2);
+ vst1q_f32(pOut, res);
+
+ /* Update pointers to process next samples */
+ pIn1 += 4U;
+ pIn2 += 4U;
+ pOut += 4U;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = numSamples % 0x4U;
+
+
+ while (blkCnt > 0U)
+ {
+ /* C(m,n) = A(m,n) - B(m,n) */
+ /* Subtract and then store the results in the destination buffer. */
+ *pOut++ = (*pIn1++) - (*pIn2++);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* Set status as ARM_MATH_SUCCESS */
+ status = ARM_MATH_SUCCESS;
+ }
+
+ /* Return to application */
+ return (status);
+}
+#else
+arm_status arm_mat_sub_f32(
+ const arm_matrix_instance_f32 * pSrcA,
+ const arm_matrix_instance_f32 * pSrcB,
+ arm_matrix_instance_f32 * pDst)
+{
+ float32_t *pInA = pSrcA->pData; /* input data matrix pointer A */
+ float32_t *pInB = pSrcB->pData; /* input data matrix pointer B */
+ float32_t *pOut = pDst->pData; /* output data matrix pointer */
+
+ uint32_t numSamples; /* total number of elements in the matrix */
+ uint32_t blkCnt; /* loop counters */
+ arm_status status; /* status of matrix subtraction */
+
+#ifdef ARM_MATH_MATRIX_CHECK
+
+ /* Check for matrix mismatch condition */
+ if ((pSrcA->numRows != pSrcB->numRows) ||
+ (pSrcA->numCols != pSrcB->numCols) ||
+ (pSrcA->numRows != pDst->numRows) ||
+ (pSrcA->numCols != pDst->numCols) )
+ {
+ /* Set status as ARM_MATH_SIZE_MISMATCH */
+ status = ARM_MATH_SIZE_MISMATCH;
+ }
+ else
+
+#endif /* #ifdef ARM_MATH_MATRIX_CHECK */
+
+ {
+ /* Total number of samples in input matrix */
+ numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+ /* Loop unrolling: Compute 4 outputs at a time */
+ blkCnt = numSamples >> 2U;
+
+ while (blkCnt > 0U)
+ {
+ /* C(m,n) = A(m,n) - B(m,n) */
+
+ /* Subtract and store result in destination buffer. */
+ *pOut++ = (*pInA++) - (*pInB++);
+ *pOut++ = (*pInA++) - (*pInB++);
+ *pOut++ = (*pInA++) - (*pInB++);
+ *pOut++ = (*pInA++) - (*pInB++);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Loop unrolling: Compute remaining outputs */
+ blkCnt = numSamples % 0x4U;
+
+#else
+
+ /* Initialize blkCnt with number of samples */
+ blkCnt = numSamples;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+ while (blkCnt > 0U)
+ {
+ /* C(m,n) = A(m,n) - B(m,n) */
+
+ /* Subtract and store result in destination buffer. */
+ *pOut++ = (*pInA++) - (*pInB++);
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Set status as ARM_MATH_SUCCESS */
+ status = ARM_MATH_SUCCESS;
+ }
+
+ /* Return to application */
+ return (status);
+}
+#endif /* #if defined(ARM_MATH_NEON) */
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+
+/**
+ @} end of MatrixSub group
+ */
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