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Diffstat (limited to 'Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c b/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c new file mode 100644 index 0000000..5920a77 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_conj_f32.c @@ -0,0 +1,213 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_cmplx_conj_f32.c + * Description: Floating-point 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 + */ + +/** + @defgroup cmplx_conj Complex Conjugate + + Conjugates the elements of a complex data vector. + + The <code>pSrc</code> points to the source data and + <code>pDst</code> points to the destination data where the result should be written. + <code>numSamples</code> specifies the number of complex samples + and the data in each array is stored in an interleaved fashion + (real, imag, real, imag, ...). + Each array has a total of <code>2*numSamples</code> values. + + The underlying algorithm is used: + <pre> + for (n = 0; n < numSamples; n++) { + pDst[(2*n) ] = pSrc[(2*n) ]; // real part + pDst[(2*n)+1] = -pSrc[(2*n)+1]; // imag part + } + </pre> + + There are separate functions for floating-point, Q15, and Q31 data types. + */ + +/** + @addtogroup cmplx_conj + @{ + */ + +/** + @brief Floating-point 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 + */ + +#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) + +void arm_cmplx_conj_f32( + const float32_t * pSrc, + float32_t * pDst, + uint32_t numSamples) +{ + static const float32_t cmplx_conj_sign[4] = { 1.0f, -1.0f, 1.0f, -1.0f }; + uint32_t blockSize = numSamples * CMPLX_DIM; /* loop counters */ + uint32_t blkCnt; + f32x4_t vecSrc; + f32x4_t vecSign; + + /* + * load sign vector + */ + vecSign = *(f32x4_t *) cmplx_conj_sign; + + /* Compute 4 real samples at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + vecSrc = vld1q(pSrc); + vst1q(pDst,vmulq(vecSrc, vecSign)); + /* + * Decrement the blkCnt loop counter + * Advance vector source and destination pointers + */ + pSrc += 4; + pDst += 4; + blkCnt--; + } + + /* Tail */ + blkCnt = (blockSize & 0x3) >> 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++; + *pDst++ = -*pSrc++; + + /* Decrement loop counter */ + blkCnt--; + } + +} + +#else +void arm_cmplx_conj_f32( + const float32_t * pSrc, + float32_t * pDst, + uint32_t numSamples) +{ + uint32_t blkCnt; /* Loop counter */ + +#if defined(ARM_MATH_NEON) && !defined(ARM_MATH_AUTOVECTORIZE) + float32x4_t zero; + float32x4x2_t vec; + + zero = vdupq_n_f32(0.0f); + + /* Compute 4 outputs at a time */ + blkCnt = numSamples >> 2U; + + while (blkCnt > 0U) + { + /* C[0]+jC[1] = A[0]+(-1)*jA[1] */ + /* Calculate Complex Conjugate and then store the results in the destination buffer. */ + vec = vld2q_f32(pSrc); + vec.val[1] = vsubq_f32(zero,vec.val[1]); + vst2q_f32(pDst,vec); + + /* Increment pointers */ + pSrc += 8; + pDst += 8; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* Tail */ + blkCnt = numSamples & 0x3; + +#else +#if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE) + + /* 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. */ + *pDst++ = *pSrc++; + *pDst++ = -*pSrc++; + + *pDst++ = *pSrc++; + *pDst++ = -*pSrc++; + + *pDst++ = *pSrc++; + *pDst++ = -*pSrc++; + + *pDst++ = *pSrc++; + *pDst++ = -*pSrc++; + + /* 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) */ +#endif /* #if defined (ARM_MATH_NEON) */ + + while (blkCnt > 0U) + { + /* C[0] + jC[1] = A[0]+ j(-1)A[1] */ + + /* Calculate Complex Conjugate and store result in destination buffer. */ + *pDst++ = *pSrc++; + *pDst++ = -*pSrc++; + + /* Decrement loop counter */ + blkCnt--; + } + +} +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + +/** + @} end of cmplx_conj group + */ |