From 86608c6770cf08c138a2bdab5855072f64be09ef Mon Sep 17 00:00:00 2001 From: joshua Date: Sat, 30 Dec 2023 23:54:31 -0500 Subject: initial commit --- .../DSP/Source/BasicMathFunctions/arm_scale_q31.c | 191 +++++++++++++++++++++ 1 file changed, 191 insertions(+) create mode 100644 Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c') diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c new file mode 100644 index 0000000..52821ed --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_q31.c @@ -0,0 +1,191 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_scale_q31.c + * Description: Multiplies a Q31 vector 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 groupMath + */ + +/** + @addtogroup BasicScale + @{ + */ + +/** + @brief Multiplies a Q31 vector by a scalar. + @param[in] pSrc points to the input vector + @param[in] scaleFract fractional portion of the scale value + @param[in] shift number of bits to shift the result by + @param[out] pDst points to the output vector + @param[in] blockSize number of samples in each vector + @return none + + @par Scaling and Overflow Behavior + The input data *pSrc and scaleFract are in 1.31 format. + These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format. + */ + +void arm_scale_q31( + const q31_t *pSrc, + q31_t scaleFract, + int8_t shift, + q31_t *pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counter */ + q31_t in, out; /* Temporary variables */ + int8_t kShift = shift + 1; /* Shift to apply after scaling */ + int8_t sign = (kShift & 0x80); + +#if defined (ARM_MATH_LOOPUNROLL) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + if (sign == 0U) + { + while (blkCnt > 0U) + { + /* C = A * scale */ + + /* Scale input and store result in destination buffer. */ + in = *pSrc++; /* read input from source */ + in = ((q63_t) in * scaleFract) >> 32; /* multiply input with scaler value */ + out = in << kShift; /* apply shifting */ + if (in != (out >> kShift)) /* saturate the result */ + out = 0x7FFFFFFF ^ (in >> 31); + *pDst++ = out; /* Store result destination */ + + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in << kShift; + if (in != (out >> kShift)) + out = 0x7FFFFFFF ^ (in >> 31); + *pDst++ = out; + + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in << kShift; + if (in != (out >> kShift)) + out = 0x7FFFFFFF ^ (in >> 31); + *pDst++ = out; + + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in << kShift; + if (in != (out >> kShift)) + out = 0x7FFFFFFF ^ (in >> 31); + *pDst++ = out; + + /* Decrement loop counter */ + blkCnt--; + } + } + else + { + while (blkCnt > 0U) + { + /* C = A * scale */ + + /* Scale input and store result in destination buffer. */ + in = *pSrc++; /* read four inputs from source */ + in = ((q63_t) in * scaleFract) >> 32; /* multiply input with scaler value */ + out = in >> -kShift; /* apply shifting */ + *pDst++ = out; /* Store result destination */ + + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in >> -kShift; + *pDst++ = out; + + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in >> -kShift; + *pDst++ = out; + + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in >> -kShift; + *pDst++ = out; + + /* Decrement loop counter */ + blkCnt--; + } + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = blockSize % 0x4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = blockSize; + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + if (sign == 0U) + { + while (blkCnt > 0U) + { + /* C = A * scale */ + + /* Scale input and store result in destination buffer. */ + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in << kShift; + if (in != (out >> kShift)) + out = 0x7FFFFFFF ^ (in >> 31); + *pDst++ = out; + + /* Decrement loop counter */ + blkCnt--; + } + } + else + { + while (blkCnt > 0U) + { + /* C = A * scale */ + + /* Scale input and store result in destination buffer. */ + in = *pSrc++; + in = ((q63_t) in * scaleFract) >> 32; + out = in >> -kShift; + *pDst++ = out; + + /* Decrement loop counter */ + blkCnt--; + } + } + +} + +/** + @} end of BasicScale group + */ -- cgit v1.2.3