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Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q15.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q15.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q15.c b/platform/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q15.c new file mode 100644 index 0000000..d5b1e3e --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/MatrixFunctions/arm_mat_scale_q15.c @@ -0,0 +1,183 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 31. July 2014 +* $Revision: V1.4.4 +* +* Project: CMSIS DSP Library +* Title: arm_mat_scale_q15.c +* +* Description: Multiplies a Q15 matrix by a scalar. +* +* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions +* are met: +* - Redistributions of source code must retain the above copyright +* notice, this list of conditions and the following disclaimer. +* - Redistributions in binary form must reproduce the above copyright +* notice, this list of conditions and the following disclaimer in +* the documentation and/or other materials provided with the +* distribution. +* - Neither the name of ARM LIMITED nor the names of its contributors +* may be used to endorse or promote products derived from this +* software without specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +* POSSIBILITY OF SUCH DAMAGE. +* -------------------------------------------------------------------- */ + +#include "arm_math.h" + +/** + * @ingroup groupMatrix + */ + +/** + * @addtogroup MatrixScale + * @{ + */ + +/** + * @brief Q15 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 The function returns either + * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking. + * + * @details + * <b>Scaling and Overflow Behavior:</b> + * \par + * The input data <code>*pSrc</code> and <code>scaleFract</code> are in 1.15 format. + * These are multiplied to yield a 2.30 intermediate result and this is shifted with saturation to 1.15 format. + */ + +arm_status arm_mat_scale_q15( + const arm_matrix_instance_q15 * pSrc, + q15_t scaleFract, + int32_t shift, + arm_matrix_instance_q15 * pDst) +{ + q15_t *pIn = pSrc->pData; /* input data matrix pointer */ + q15_t *pOut = pDst->pData; /* output data matrix pointer */ + uint32_t numSamples; /* total number of elements in the matrix */ + int32_t totShift = 15 - shift; /* total shift to apply after scaling */ + uint32_t blkCnt; /* loop counters */ + arm_status status; /* status of matrix scaling */ + +#ifndef ARM_MATH_CM0_FAMILY + + q15_t in1, in2, in3, in4; + q31_t out1, out2, out3, out4; + q31_t inA1, inA2; + +#endif // #ifndef ARM_MATH_CM0_FAMILY + +#ifdef ARM_MATH_MATRIX_CHECK + /* Check for matrix mismatch */ + 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_FAMILY + + /* 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) * k */ + /* Scale, saturate and then store the results in the destination buffer. */ + /* Reading 2 inputs from memory */ + inA1 = _SIMD32_OFFSET(pIn); + inA2 = _SIMD32_OFFSET(pIn + 2); + + /* C = A * scale */ + /* Scale the inputs and then store the 2 results in the destination buffer + * in single cycle by packing the outputs */ + out1 = (q31_t) ((q15_t) (inA1 >> 16) * scaleFract); + out2 = (q31_t) ((q15_t) inA1 * scaleFract); + out3 = (q31_t) ((q15_t) (inA2 >> 16) * scaleFract); + out4 = (q31_t) ((q15_t) inA2 * scaleFract); + + out1 = out1 >> totShift; + inA1 = _SIMD32_OFFSET(pIn + 4); + out2 = out2 >> totShift; + inA2 = _SIMD32_OFFSET(pIn + 6); + out3 = out3 >> totShift; + out4 = out4 >> totShift; + + in1 = (q15_t) (__SSAT(out1, 16)); + in2 = (q15_t) (__SSAT(out2, 16)); + in3 = (q15_t) (__SSAT(out3, 16)); + in4 = (q15_t) (__SSAT(out4, 16)); + + _SIMD32_OFFSET(pOut) = __PKHBT(in2, in1, 16); + _SIMD32_OFFSET(pOut + 2) = __PKHBT(in4, in3, 16); + + /* 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; + +#else + + /* Run the below code for Cortex-M0 */ + + /* Initialize blkCnt with number of samples */ + blkCnt = numSamples; + +#endif /* #ifndef ARM_MATH_CM0_FAMILY */ + + while(blkCnt > 0u) + { + /* C(m,n) = A(m,n) * k */ + /* Scale, saturate and then store the results in the destination buffer. */ + *pOut++ = + (q15_t) (__SSAT(((q31_t) (*pIn++) * scaleFract) >> totShift, 16)); + + /* Decrement the numSamples loop counter */ + blkCnt--; + } + /* Set status as ARM_MATH_SUCCESS */ + status = ARM_MATH_SUCCESS; + } + + /* Return to application */ + return (status); +} + +/** + * @} end of MatrixScale group + */ |