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_shift_q15.c | 201 +++++++++++++++++++++ 1 file changed, 201 insertions(+) create mode 100644 Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q15.c (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q15.c') diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q15.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q15.c new file mode 100644 index 0000000..360be97 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q15.c @@ -0,0 +1,201 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_shift_q15.c + * Description: Shifts the elements of a Q15 vector by a specified number of bits + * + * $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 BasicShift + @{ + */ + +/** + @brief Shifts the elements of a Q15 vector a specified number of bits + @param[in] pSrc points to the input vector + @param[in] shiftBits number of bits to shift. A positive value shifts left; a negative value shifts right. + @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 function uses saturating arithmetic. + Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated. + */ + +void arm_shift_q15( + const q15_t * pSrc, + int8_t shiftBits, + q15_t * pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counter */ + uint8_t sign = (shiftBits & 0x80); /* Sign of shiftBits */ + +#if defined (ARM_MATH_LOOPUNROLL) + +#if defined (ARM_MATH_DSP) + q15_t in1, in2; /* Temporary input variables */ +#endif + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + /* If the shift value is positive then do right shift else left shift */ + if (sign == 0U) + { + while (blkCnt > 0U) + { + /* C = A << shiftBits */ + +#if defined (ARM_MATH_DSP) + /* read 2 samples from source */ + in1 = *pSrc++; + in2 = *pSrc++; + + /* Shift the inputs and then store the results in the destination buffer. */ +#ifndef ARM_MATH_BIG_ENDIAN + write_q15x2_ia (&pDst, __PKHBT(__SSAT((in1 << shiftBits), 16), + __SSAT((in2 << shiftBits), 16), 16)); +#else + write_q15x2_ia (&pDst, __PKHBT(__SSAT((in2 << shiftBits), 16), + __SSAT((in1 << shiftBits), 16), 16)); +#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ + + /* read 2 samples from source */ + in1 = *pSrc++; + in2 = *pSrc++; + +#ifndef ARM_MATH_BIG_ENDIAN + write_q15x2_ia (&pDst, __PKHBT(__SSAT((in1 << shiftBits), 16), + __SSAT((in2 << shiftBits), 16), 16)); +#else + write_q15x2_ia (&pDst, __PKHBT(__SSAT((in2 << shiftBits), 16), + __SSAT((in1 << shiftBits), 16), 16)); +#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ + +#else + *pDst++ = __SSAT(((q31_t) *pSrc++ << shiftBits), 16); + *pDst++ = __SSAT(((q31_t) *pSrc++ << shiftBits), 16); + *pDst++ = __SSAT(((q31_t) *pSrc++ << shiftBits), 16); + *pDst++ = __SSAT(((q31_t) *pSrc++ << shiftBits), 16); +#endif + + /* Decrement loop counter */ + blkCnt--; + } + } + else + { + while (blkCnt > 0U) + { + /* C = A >> shiftBits */ + +#if defined (ARM_MATH_DSP) + /* read 2 samples from source */ + in1 = *pSrc++; + in2 = *pSrc++; + + /* Shift the inputs and then store the results in the destination buffer. */ +#ifndef ARM_MATH_BIG_ENDIAN + write_q15x2_ia (&pDst, __PKHBT((in1 >> -shiftBits), + (in2 >> -shiftBits), 16)); +#else + write_q15x2_ia (&pDst, __PKHBT((in2 >> -shiftBits), + (in1 >> -shiftBits), 16)); +#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ + + /* read 2 samples from source */ + in1 = *pSrc++; + in2 = *pSrc++; + +#ifndef ARM_MATH_BIG_ENDIAN + write_q15x2_ia (&pDst, __PKHBT((in1 >> -shiftBits), + (in2 >> -shiftBits), 16)); +#else + write_q15x2_ia (&pDst, __PKHBT((in2 >> -shiftBits), + (in1 >> -shiftBits), 16)); +#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ + +#else + *pDst++ = (*pSrc++ >> -shiftBits); + *pDst++ = (*pSrc++ >> -shiftBits); + *pDst++ = (*pSrc++ >> -shiftBits); + *pDst++ = (*pSrc++ >> -shiftBits); +#endif + + /* 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 the shift value is positive then do right shift else left shift */ + if (sign == 0U) + { + while (blkCnt > 0U) + { + /* C = A << shiftBits */ + + /* Shift input and store result in destination buffer. */ + *pDst++ = __SSAT(((q31_t) *pSrc++ << shiftBits), 16); + + /* Decrement loop counter */ + blkCnt--; + } + } + else + { + while (blkCnt > 0U) + { + /* C = A >> shiftBits */ + + /* Shift input and store result in destination buffer. */ + *pDst++ = (*pSrc++ >> -shiftBits); + + /* Decrement loop counter */ + blkCnt--; + } + } + +} + +/** + @} end of BasicShift group + */ -- cgit v1.2.3