| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_mat_sub_q31.c |
| * Description: Q31 matrix 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 groupMatrix |
| */ |
| |
| /** |
| @addtogroup MatrixSub |
| @{ |
| */ |
| |
| /** |
| @brief Q31 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 |
| |
| @par Scaling and Overflow Behavior |
| The function uses saturating arithmetic. |
| Results outside of the allowable Q31 range [0x80000000 0x7FFFFFFF] are saturated. |
| */ |
| |
| arm_status arm_mat_sub_q31( |
| const arm_matrix_instance_q31 * pSrcA, |
| const arm_matrix_instance_q31 * pSrcB, |
| arm_matrix_instance_q31 * pDst) |
| { |
| q31_t *pInA = pSrcA->pData; /* input data matrix pointer A */ |
| q31_t *pInB = pSrcB->pData; /* input data matrix pointer B */ |
| q31_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, saturate and then store the results in the destination buffer. */ |
| *pOut++ = __QSUB(*pInA++, *pInB++); |
| |
| *pOut++ = __QSUB(*pInA++, *pInB++); |
| |
| *pOut++ = __QSUB(*pInA++, *pInB++); |
| |
| *pOut++ = __QSUB(*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, saturate and store result in destination buffer. */ |
| *pOut++ = __QSUB(*pInA++, *pInB++); |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| /* Set status as ARM_MATH_SUCCESS */ |
| status = ARM_MATH_SUCCESS; |
| } |
| |
| /* Return to application */ |
| return (status); |
| } |
| |
| /** |
| @} end of MatrixSub group |
| */ |