| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_mat_scale_q31.c |
| * Description: Multiplies a Q31 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 |
| */ |
| |
| /** |
| @addtogroup MatrixScale |
| @{ |
| */ |
| |
| /** |
| @brief Q31 matrix scaling. |
| @param[in] pSrc points to input matrix |
| @param[in] scaleFract fractional portion of the scale factor |
| @param[in] shift number of bits to shift the result by |
| @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 input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.31 format. |
| These are multiplied to yield a 2.62 intermediate result which is shifted with saturation to 1.31 format. |
| */ |
| |
| arm_status arm_mat_scale_q31( |
| const arm_matrix_instance_q31 * pSrc, |
| q31_t scaleFract, |
| int32_t shift, |
| arm_matrix_instance_q31 * pDst) |
| { |
| q31_t *pIn = pSrc->pData; /* Input data matrix pointer */ |
| q31_t *pOut = pDst->pData; /* Output data matrix pointer */ |
| uint32_t numSamples; /* Total number of elements in the matrix */ |
| uint32_t blkCnt; /* Loop counter */ |
| arm_status status; /* Status of matrix scaling */ |
| int32_t kShift = shift + 1; /* Shift to apply after scaling */ |
| q31_t in, out; /* Temporary variabels */ |
| |
| #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) * k */ |
| |
| /* Scale, saturate and store result in destination buffer. */ |
| in = *pIn++; /* read four inputs from source */ |
| in = ((q63_t) in * scaleFract) >> 32; /* multiply input with scaler value */ |
| out = in << kShift; /* apply shifting */ |
| if (in != (out >> kShift)) /* saturate the results. */ |
| out = 0x7FFFFFFF ^ (in >> 31); |
| *pOut++ = out; /* Store result destination */ |
| |
| in = *pIn++; |
| in = ((q63_t) in * scaleFract) >> 32; |
| out = in << kShift; |
| if (in != (out >> kShift)) |
| out = 0x7FFFFFFF ^ (in >> 31); |
| *pOut++ = out; |
| |
| in = *pIn++; |
| in = ((q63_t) in * scaleFract) >> 32; |
| out = in << kShift; |
| if (in != (out >> kShift)) |
| out = 0x7FFFFFFF ^ (in >> 31); |
| *pOut++ = out; |
| |
| in = *pIn++; |
| in = ((q63_t) in * scaleFract) >> 32; |
| out = in << kShift; |
| if (in != (out >> kShift)) |
| out = 0x7FFFFFFF ^ (in >> 31); |
| *pOut++ = out; |
| |
| /* 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) * k */ |
| |
| /* Scale, saturate and store result in destination buffer. */ |
| in = *pIn++; |
| in = ((q63_t) in * scaleFract) >> 32; |
| out = in << kShift; |
| if (in != (out >> kShift)) |
| out = 0x7FFFFFFF ^ (in >> 31); |
| *pOut++ = out; |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| /* Set status as ARM_MATH_SUCCESS */ |
| status = ARM_MATH_SUCCESS; |
| } |
| |
| /* Return to application */ |
| return (status); |
| } |
| |
| /** |
| @} end of MatrixScale group |
| */ |