diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q31.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q31.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q31.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q31.c new file mode 100644 index 0000000..7043aa0 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q31.c @@ -0,0 +1,208 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_abs_q31.c + * Description: Q31 vector absolute value + * + * $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 BasicAbs + @{ + */ + +/** + @brief Q31 vector absolute value. + @param[in] pSrc points to the input vector + @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. + The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF. + */ + +#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" + +void arm_abs_q31( + const q31_t * pSrc, + q31_t * pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counters */ + q31x4_t vecSrc; + + /* Compute 4 outputs at a time */ + blkCnt = blockSize >> 2; + + while (blkCnt > 0U) + { + /* + * C = |A| + * Calculate absolute and then store the results in the destination buffer. + */ + vecSrc = vld1q(pSrc); + vst1q(pDst, vqabsq(vecSrc)); + /* + * Decrement the blockSize loop counter + */ + blkCnt--; + /* + * Advance vector source and destination pointers + */ + pSrc += 4; + pDst += 4; + } + /* + * Tail + */ + blkCnt = blockSize & 3; + + if (blkCnt > 0U) + { + mve_pred16_t p0 = vctp32q(blkCnt); + vecSrc = vld1q(pSrc); + vstrwq_p(pDst, vqabsq(vecSrc), p0); + } +} + +#else +void arm_abs_q31( + const q31_t * pSrc, + q31_t * pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counter */ + q31_t in; /* Temporary variable */ + +#if defined(ARM_MATH_NEON) + int32x4_t vec1; + int32x4_t res; + + /* Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = |A| */ + /* Calculate absolute and then store the results in the destination buffer. */ + + vec1 = vld1q_s32(pSrc); + res = vqabsq_s32(vec1); + vst1q_s32(pDst, res); + + /* Increment pointers */ + pSrc += 4; + pDst += 4; + + /* Decrement the blockSize loop counter */ + blkCnt--; + } + + /* Tail */ + blkCnt = blockSize & 0x3; + +#else +#if defined (ARM_MATH_LOOPUNROLL) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = |A| */ + + /* Calculate absolute of input (if -1 then saturated to 0x7fffffff) and store result in destination buffer. */ + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q31_t)__QSUB(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == INT32_MIN) ? INT32_MAX : -in); +#endif + + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q31_t)__QSUB(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == INT32_MIN) ? INT32_MAX : -in); +#endif + + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q31_t)__QSUB(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == INT32_MIN) ? INT32_MAX : -in); +#endif + + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q31_t)__QSUB(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == INT32_MIN) ? INT32_MAX : -in); +#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) */ +#endif /* #if defined (ARM_MATH_NEON) */ + + while (blkCnt > 0U) + { + /* C = |A| */ + + /* Calculate absolute of input (if -1 then saturated to 0x7fffffff) and store result in destination buffer. */ + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q31_t)__QSUB(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == INT32_MIN) ? INT32_MAX : -in); +#endif + + /* Decrement loop counter */ + blkCnt--; + } + +} +#endif /* #if defined (ARM_MATH_MVEI) */ +/** + @} end of BasicAbs group + */ |