diff options
| author | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
|---|---|---|
| committer | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
| commit | 5b81bc8ccbd342b8566d88fc9f17a73aec03b5b6 (patch) | |
| tree | cc57486912cfa74c6440d8b97c28f451ec787d78 /Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q7.c | |
initial commit
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q7.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q7.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q7.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q7.c new file mode 100644 index 0000000..4f83edc --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_shift_q7.c @@ -0,0 +1,225 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_shift_q7.c + * Description: Processing function for the Q7 Shifting + * + * $Date: 23 April 2021 + * $Revision: V1.9.0 + * + * Target Processor: Cortex-M and Cortex-A cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2021 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 "dsp/basic_math_functions.h" + +/** + @ingroup groupMath + */ + +/** + @addtogroup BasicShift + @{ + */ + +/** + @brief Shifts the elements of a Q7 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 onditions for optimum performance + Input and output buffers should be aligned by 32-bit + @par Scaling and Overflow Behavior + The function uses saturating arithmetic. + Results outside of the allowable Q7 range [0x80 0x7F] are saturated. + */ + +#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" + +void arm_shift_q7( + const q7_t * pSrc, + int8_t shiftBits, + q7_t * pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* loop counters */ + q7x16_t vecSrc; + q7x16_t vecDst; + + /* Compute 16 outputs at a time */ + blkCnt = blockSize >> 4; + while (blkCnt > 0U) + { + /* + * C = A (>> or <<) shiftBits + * Shift the input and then store the result in the destination buffer. + */ + vecSrc = vld1q(pSrc); + vecDst = vqshlq_r(vecSrc, shiftBits); + vst1q(pDst, vecDst); + /* + * Decrement the blockSize loop counter + */ + blkCnt--; + /* + * advance vector source and destination pointers + */ + pSrc += 16; + pDst += 16; + } + /* + * tail + */ + blkCnt = blockSize & 0xF; + if (blkCnt > 0U) + { + mve_pred16_t p0 = vctp8q(blkCnt); + vecSrc = vld1q(pSrc); + vecDst = vqshlq_r(vecSrc, shiftBits); + vstrbq_p(pDst, vecDst, p0); + } +} + +#else +void arm_shift_q7( + const q7_t * pSrc, + int8_t shiftBits, + q7_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) + q7_t in1, in2, in3, in4; /* 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 4 inputs */ + in1 = *pSrc++; + in2 = *pSrc++; + in3 = *pSrc++; + in4 = *pSrc++; + + /* Pack and store result in destination buffer (in single write) */ + write_q7x4_ia (&pDst, __PACKq7(__SSAT(((q15_t) in1 << shiftBits), 8), + __SSAT(((q15_t) in2 << shiftBits), 8), + __SSAT(((q15_t) in3 << shiftBits), 8), + __SSAT(((q15_t) in4 << shiftBits), 8) )); +#else + *pDst++ = (q7_t) __SSAT(((q15_t) *pSrc++ << shiftBits), 8); + *pDst++ = (q7_t) __SSAT(((q15_t) *pSrc++ << shiftBits), 8); + *pDst++ = (q7_t) __SSAT(((q15_t) *pSrc++ << shiftBits), 8); + *pDst++ = (q7_t) __SSAT(((q15_t) *pSrc++ << shiftBits), 8); +#endif + + /* Decrement loop counter */ + blkCnt--; + } + } + else + { + while (blkCnt > 0U) + { + /* C = A >> shiftBits */ + +#if defined (ARM_MATH_DSP) + /* Read 4 inputs */ + in1 = *pSrc++; + in2 = *pSrc++; + in3 = *pSrc++; + in4 = *pSrc++; + + /* Pack and store result in destination buffer (in single write) */ + write_q7x4_ia (&pDst, __PACKq7((in1 >> -shiftBits), + (in2 >> -shiftBits), + (in3 >> -shiftBits), + (in4 >> -shiftBits) )); +#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++ = (q7_t) __SSAT(((q15_t) *pSrc++ << shiftBits), 8); + + /* 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--; + } + } + +} +#endif /* defined(ARM_MATH_MVEI) */ + +/** + @} end of BasicShift group + */ |