diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_q15.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_q15.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_q15.c b/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_q15.c new file mode 100644 index 0000000..fb350a0 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_q15.c @@ -0,0 +1,207 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_cmplx_conj_q15.c + * Description: Q15 complex conjugate + * + * $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/complex_math_functions.h" + +/** + @ingroup groupCmplxMath + */ + +/** + @addtogroup cmplx_conj + @{ + */ + +/** + @brief Q15 complex conjugate. + @param[in] pSrc points to the input vector + @param[out] pDst points to the output vector + @param[in] numSamples number of samples in each vector + @return none + + @par Scaling and Overflow Behavior + The function uses saturating arithmetic. + The Q15 value -1 (0x8000) is saturated to the maximum allowable positive value 0x7FFF. + */ + + +#if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE) +void arm_cmplx_conj_q15( + const q15_t * pSrc, + q15_t * pDst, + uint32_t numSamples) +{ + uint32_t blockSize = numSamples * CMPLX_DIM; /* loop counters */ + uint32_t blkCnt; + q31_t in1; + + q15x8x2_t vecSrc; + q15x8_t zero; + + zero = vdupq_n_s16(0); + + /* Compute 8 real samples at a time */ + blkCnt = blockSize >> 4U; + while (blkCnt > 0U) + { + vecSrc = vld2q(pSrc); + vecSrc.val[1] = vqsubq(zero, vecSrc.val[1]); + vst2q(pDst,vecSrc); + /* + * Decrement the blkCnt loop counter + * Advance vector source and destination pointers + */ + pSrc += 16; + pDst += 16; + blkCnt --; + } + + /* Tail */ + blkCnt = (blockSize & 0xF) >> 1; + + while (blkCnt > 0U) + { + /* C[0] + jC[1] = A[0]+ j(-1)A[1] */ + + /* Calculate Complex Conjugate and store result in destination buffer. */ + *pDst++ = *pSrc++; + in1 = *pSrc++; + *pDst++ = __SSAT(-in1, 16); + + /* Decrement loop counter */ + blkCnt--; + } +} +#else +void arm_cmplx_conj_q15( + const q15_t * pSrc, + q15_t * pDst, + uint32_t numSamples) +{ + uint32_t blkCnt; /* Loop counter */ + q31_t in1; /* Temporary input variable */ + +#if defined (ARM_MATH_LOOPUNROLL) && defined (ARM_MATH_DSP) + q31_t in2, in3, in4; /* Temporary input variables */ +#endif + + +#if defined (ARM_MATH_LOOPUNROLL) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = numSamples >> 2U; + + while (blkCnt > 0U) + { + /* C[0] + jC[1] = A[0]+ j(-1)A[1] */ + + /* Calculate Complex Conjugate and store result in destination buffer. */ + +#if defined (ARM_MATH_DSP) + in1 = read_q15x2_ia (&pSrc); + in2 = read_q15x2_ia (&pSrc); + in3 = read_q15x2_ia (&pSrc); + in4 = read_q15x2_ia (&pSrc); + +#ifndef ARM_MATH_BIG_ENDIAN + in1 = __QASX(0, in1); + in2 = __QASX(0, in2); + in3 = __QASX(0, in3); + in4 = __QASX(0, in4); +#else + in1 = __QSAX(0, in1); + in2 = __QSAX(0, in2); + in3 = __QSAX(0, in3); + in4 = __QSAX(0, in4); +#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ + + in1 = ((uint32_t) in1 >> 16) | ((uint32_t) in1 << 16); + in2 = ((uint32_t) in2 >> 16) | ((uint32_t) in2 << 16); + in3 = ((uint32_t) in3 >> 16) | ((uint32_t) in3 << 16); + in4 = ((uint32_t) in4 >> 16) | ((uint32_t) in4 << 16); + + write_q15x2_ia (&pDst, in1); + write_q15x2_ia (&pDst, in2); + write_q15x2_ia (&pDst, in3); + write_q15x2_ia (&pDst, in4); +#else + *pDst++ = *pSrc++; + in1 = *pSrc++; + *pDst++ = (in1 == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in1; + + *pDst++ = *pSrc++; + in1 = *pSrc++; + *pDst++ = (in1 == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in1; + + *pDst++ = *pSrc++; + in1 = *pSrc++; + *pDst++ = (in1 == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in1; + + *pDst++ = *pSrc++; + in1 = *pSrc++; + *pDst++ = (in1 == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in1; + +#endif /* #if defined (ARM_MATH_DSP) */ + + /* Decrement loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = numSamples % 0x4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = numSamples; + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* C[0] + jC[1] = A[0]+ j(-1)A[1] */ + + /* Calculate Complex Conjugate and store result in destination buffer. */ + *pDst++ = *pSrc++; + in1 = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = __SSAT(-in1, 16); +#else + *pDst++ = (in1 == (q15_t) 0x8000) ? (q15_t) 0x7fff : -in1; +#endif + + /* Decrement loop counter */ + blkCnt--; + } + +} +#endif /* defined(ARM_MATH_MVEI) */ + +/** + @} end of cmplx_conj group + */ |