| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_mat_scale_f32.c |
| * Description: Multiplies a floating-point matrix by a scalar |
| * |
| * $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 |
| */ |
| |
| /** |
| @defgroup MatrixScale Matrix Scale |
| |
| Multiplies a matrix by a scalar. This is accomplished by multiplying each element in the |
| matrix by the scalar. For example: |
| \image html MatrixScale.gif "Matrix Scaling of a 3 x 3 matrix" |
| |
| The function checks to make sure that the input and output matrices are of the same size. |
| |
| In the fixed-point Q15 and Q31 functions, <code>scale</code> is represented by |
| a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>. |
| The shift allows the gain of the scaling operation to exceed 1.0. |
| The overall scale factor applied to the fixed-point data is |
| <pre> |
| scale = scaleFract * 2^shift. |
| </pre> |
| */ |
| |
| /** |
| @addtogroup MatrixScale |
| @{ |
| */ |
| |
| /** |
| @brief Floating-point matrix scaling. |
| @param[in] pSrc points to input matrix |
| @param[in] scale scale factor to be applied |
| @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_NEON_EXPERIMENTAL) |
| arm_status arm_mat_scale_f32( |
| const arm_matrix_instance_f32 * pSrc, |
| float32_t scale, |
| arm_matrix_instance_f32 * pDst) |
| { |
| float32_t *pIn = pSrc->pData; /* input data matrix pointer */ |
| 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 scaling */ |
| |
| |
| float32_t in1, in2, in3, in4; /* temporary variables */ |
| float32_t out1, out2, out3, out4; /* temporary variables */ |
| |
| |
| #ifdef ARM_MATH_MATRIX_CHECK |
| /* Check for matrix mismatch condition */ |
| if ((pSrc->numRows != pDst->numRows) || (pSrc->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 res; |
| |
| /* Total number of samples in the input matrix */ |
| numSamples = (uint32_t) pSrc->numRows * pSrc->numCols; |
| |
| blkCnt = numSamples >> 2; |
| |
| /* 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) * scale */ |
| /* Scaling and results are stored in the destination buffer. */ |
| vec1 = vld1q_f32(pIn); |
| res = vmulq_f32(vec1, vdupq_n_f32(scale)); |
| vst1q_f32(pOut, res); |
| |
| /* update pointers to process next sampels */ |
| pIn += 4U; |
| pOut += 4U; |
| |
| /* Decrement the numSamples 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) * scale */ |
| /* The results are stored in the destination buffer. */ |
| *pOut++ = (*pIn++) * scale; |
| |
| /* 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_scale_f32( |
| const arm_matrix_instance_f32 * pSrc, |
| float32_t scale, |
| arm_matrix_instance_f32 * pDst) |
| { |
| float32_t *pIn = pSrc->pData; /* Input data matrix pointer */ |
| 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 scaling */ |
| |
| #ifdef ARM_MATH_MATRIX_CHECK |
| |
| /* Check for matrix mismatch condition */ |
| if ((pSrc->numRows != pDst->numRows) || |
| (pSrc->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) pSrc->numRows * pSrc->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) * scale */ |
| |
| /* Scale and store result in destination buffer. */ |
| *pOut++ = (*pIn++) * scale; |
| *pOut++ = (*pIn++) * scale; |
| *pOut++ = (*pIn++) * scale; |
| *pOut++ = (*pIn++) * scale; |
| |
| /* 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) * scale */ |
| |
| /* Scale and store result in destination buffer. */ |
| *pOut++ = (*pIn++) * scale; |
| |
| /* 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) */ |
| |
| /** |
| @} end of MatrixScale group |
| */ |