arm_mat_scale_f32.c
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| 4.8 KiB
| text/x-c
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CLexer
jeandet@pc-de-jeandet3.LAB-LPP.LOCAL
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r41 | /* ---------------------------------------------------------------------- | ||
| * Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
| * | ||||
| * $Date: 15. July 2011 | ||||
| * $Revision: V1.0.10 | ||||
| * | ||||
| * Project: CMSIS DSP Library | ||||
| * Title: arm_mat_scale_f32.c | ||||
| * | ||||
| * Description: Multiplies a floating-point matrix by a scalar. | ||||
| * | ||||
| * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 | ||||
| * | ||||
| * Version 1.0.10 2011/7/15 | ||||
| * Big Endian support added and Merged M0 and M3/M4 Source code. | ||||
| * | ||||
| * Version 1.0.3 2010/11/29 | ||||
| * Re-organized the CMSIS folders and updated documentation. | ||||
| * | ||||
| * Version 1.0.2 2010/11/11 | ||||
| * Documentation updated. | ||||
| * | ||||
| * Version 1.0.1 2010/10/05 | ||||
| * Production release and review comments incorporated. | ||||
| * | ||||
| * Version 1.0.0 2010/09/20 | ||||
| * Production release and review comments incorporated. | ||||
| * | ||||
| * Version 0.0.5 2010/04/26 | ||||
| * incorporated review comments and updated with latest CMSIS layer | ||||
| * | ||||
| * Version 0.0.3 2010/03/10 | ||||
| * Initial version | ||||
| * -------------------------------------------------------------------- */ | ||||
| #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 structure | ||||
| * @param[in] scale scale factor to be applied | ||||
| * @param[out] *pDst points to output matrix structure | ||||
| * @return The function returns either <code>ARM_MATH_SIZE_MISMATCH</code> | ||||
| * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking. | ||||
| * | ||||
| */ | ||||
| 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 the input matrix */ | ||||
| numSamples = (uint32_t) pSrc->numRows * pSrc->numCols; | ||||
| #ifndef ARM_MATH_CM0 | ||||
| /* Run the below code for Cortex-M4 and Cortex-M3 */ | ||||
| /* Loop Unrolling */ | ||||
| blkCnt = numSamples >> 2; | ||||
| /* First part of the processing with loop unrolling. 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. */ | ||||
| *pOut++ = (*pIn++) * scale; | ||||
| *pOut++ = (*pIn++) * scale; | ||||
| *pOut++ = (*pIn++) * scale; | ||||
| *pOut++ = (*pIn++) * scale; | ||||
| /* 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; | ||||
| #else | ||||
| /* Run the below code for Cortex-M0 */ | ||||
| /* Initialize blkCnt with number of samples */ | ||||
| blkCnt = numSamples; | ||||
| #endif /* #ifndef ARM_MATH_CM0 */ | ||||
| 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); | ||||
| } | ||||
| /** | ||||
| * @} end of MatrixScale group | ||||
| */ | ||||