| /* ---------------------------------------------------------------------- |
| * Project: CMSIS DSP Library |
| * Title: arm_cmplx_mult_real_f32.c |
| * Description: Floating-point complex by real multiplication |
| * |
| * $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 groupCmplxMath |
| */ |
| |
| /** |
| @defgroup CmplxByRealMult Complex-by-Real Multiplication |
| |
| Multiplies a complex vector by a real vector and generates a complex result. |
| The data in the complex arrays is stored in an interleaved fashion |
| (real, imag, real, imag, ...). |
| The parameter <code>numSamples</code> represents the number of complex |
| samples processed. The complex arrays have a total of <code>2*numSamples</code> |
| real values while the real array has a total of <code>numSamples</code> |
| real values. |
| |
| The underlying algorithm is used: |
| |
| <pre> |
| for (n = 0; n < numSamples; n++) { |
| pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n]; |
| pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n]; |
| } |
| </pre> |
| |
| There are separate functions for floating-point, Q15, and Q31 data types. |
| */ |
| |
| /** |
| @addtogroup CmplxByRealMult |
| @{ |
| */ |
| |
| /** |
| @brief Floating-point complex-by-real multiplication. |
| @param[in] pSrcCmplx points to complex input vector |
| @param[in] pSrcReal points to real input vector |
| @param[out] pCmplxDst points to complex output vector |
| @param[in] numSamples number of samples in each vector |
| @return none |
| */ |
| |
| void arm_cmplx_mult_real_f32( |
| const float32_t * pSrcCmplx, |
| const float32_t * pSrcReal, |
| float32_t * pCmplxDst, |
| uint32_t numSamples) |
| { |
| uint32_t blkCnt; /* Loop counter */ |
| float32_t in; /* Temporary variable */ |
| |
| #if defined(ARM_MATH_NEON) |
| float32x4_t r; |
| float32x4x2_t ab,outCplx; |
| |
| /* Compute 4 outputs at a time */ |
| blkCnt = numSamples >> 2U; |
| |
| while (blkCnt > 0U) |
| { |
| ab = vld2q_f32(pSrcCmplx); // load & separate real/imag pSrcA (de-interleave 2) |
| r = vld1q_f32(pSrcReal); // load & separate real/imag pSrcB |
| |
| /* Increment pointers */ |
| pSrcCmplx += 8; |
| pSrcReal += 4; |
| |
| outCplx.val[0] = vmulq_f32(ab.val[0], r); |
| outCplx.val[1] = vmulq_f32(ab.val[1], r); |
| |
| vst2q_f32(pCmplxDst, outCplx); |
| pCmplxDst += 8; |
| |
| blkCnt--; |
| } |
| |
| /* Tail */ |
| blkCnt = numSamples & 3; |
| #else |
| #if defined (ARM_MATH_LOOPUNROLL) |
| |
| /* Loop unrolling: Compute 4 outputs at a time */ |
| blkCnt = numSamples >> 2U; |
| |
| while (blkCnt > 0U) |
| { |
| /* C[2 * i ] = A[2 * i ] * B[i]. */ |
| /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ |
| |
| in = *pSrcReal++; |
| /* store result in destination buffer. */ |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| |
| in = *pSrcReal++; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| |
| in = *pSrcReal++; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| |
| in = *pSrcReal++; |
| *pCmplxDst++ = *pSrcCmplx++* in; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| |
| /* 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[2 * i ] = A[2 * i ] * B[i]. */ |
| /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ |
| |
| in = *pSrcReal++; |
| /* store result in destination buffer. */ |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| *pCmplxDst++ = *pSrcCmplx++ * in; |
| |
| /* Decrement loop counter */ |
| blkCnt--; |
| } |
| |
| } |
| |
| /** |
| @} end of CmplxByRealMult group |
| */ |