| /* ---------------------------------------------------------------------- |
| * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
| * |
| * $Date: 19. March 2015 |
| * $Revision: V.1.4.5 |
| * |
| * Project: CMSIS DSP Library |
| * Title: arm_cmplx_mag_squared_f32.c |
| * |
| * Description: Floating-point complex magnitude squared. |
| * |
| * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * - Neither the name of ARM LIMITED nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * ---------------------------------------------------------------------------- */ |
| #include "arm_math.h" |
| |
| /** |
| * @ingroup groupCmplxMath |
| */ |
| |
| /** |
| * @defgroup cmplx_mag_squared Complex Magnitude Squared |
| * |
| * Computes the magnitude squared of the elements of a complex data vector. |
| * |
| * The <code>pSrc</code> points to the source data and |
| * <code>pDst</code> points to the where the result should be written. |
| * <code>numSamples</code> specifies the number of complex samples |
| * in the input array and the data is stored in an interleaved fashion |
| * (real, imag, real, imag, ...). |
| * The input array has a total of <code>2*numSamples</code> values; |
| * the output array has a total of <code>numSamples</code> values. |
| * |
| * The underlying algorithm is used: |
| * |
| * <pre> |
| * for(n=0; n<numSamples; n++) { |
| * pDst[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2; |
| * } |
| * </pre> |
| * |
| * There are separate functions for floating-point, Q15, and Q31 data types. |
| */ |
| |
| /** |
| * @addtogroup cmplx_mag_squared |
| * @{ |
| */ |
| |
| |
| /** |
| * @brief Floating-point complex magnitude squared |
| * @param[in] *pSrc points to the complex input vector |
| * @param[out] *pDst points to the real output vector |
| * @param[in] numSamples number of complex samples in the input vector |
| * @return none. |
| */ |
| |
| void arm_cmplx_mag_squared_f32( |
| float32_t * pSrc, |
| float32_t * pDst, |
| uint32_t numSamples) |
| { |
| float32_t real, imag; /* Temporary variables to store real and imaginary values */ |
| uint32_t blkCnt; /* loop counter */ |
| |
| #ifndef ARM_MATH_CM0_FAMILY |
| float32_t real1, real2, real3, real4; /* Temporary variables to hold real values */ |
| float32_t imag1, imag2, imag3, imag4; /* Temporary variables to hold imaginary values */ |
| float32_t mul1, mul2, mul3, mul4; /* Temporary variables */ |
| float32_t mul5, mul6, mul7, mul8; /* Temporary variables */ |
| float32_t out1, out2, out3, out4; /* Temporary variables to hold output values */ |
| |
| /*loop Unrolling */ |
| blkCnt = numSamples >> 2u; |
| |
| /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
| ** a second loop below computes the remaining 1 to 3 samples. */ |
| while(blkCnt > 0u) |
| { |
| /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
| /* read real input sample from source buffer */ |
| real1 = pSrc[0]; |
| /* read imaginary input sample from source buffer */ |
| imag1 = pSrc[1]; |
| |
| /* calculate power of real value */ |
| mul1 = real1 * real1; |
| |
| /* read real input sample from source buffer */ |
| real2 = pSrc[2]; |
| |
| /* calculate power of imaginary value */ |
| mul2 = imag1 * imag1; |
| |
| /* read imaginary input sample from source buffer */ |
| imag2 = pSrc[3]; |
| |
| /* calculate power of real value */ |
| mul3 = real2 * real2; |
| |
| /* read real input sample from source buffer */ |
| real3 = pSrc[4]; |
| |
| /* calculate power of imaginary value */ |
| mul4 = imag2 * imag2; |
| |
| /* read imaginary input sample from source buffer */ |
| imag3 = pSrc[5]; |
| |
| /* calculate power of real value */ |
| mul5 = real3 * real3; |
| /* calculate power of imaginary value */ |
| mul6 = imag3 * imag3; |
| |
| /* read real input sample from source buffer */ |
| real4 = pSrc[6]; |
| |
| /* accumulate real and imaginary powers */ |
| out1 = mul1 + mul2; |
| |
| /* read imaginary input sample from source buffer */ |
| imag4 = pSrc[7]; |
| |
| /* accumulate real and imaginary powers */ |
| out2 = mul3 + mul4; |
| |
| /* calculate power of real value */ |
| mul7 = real4 * real4; |
| /* calculate power of imaginary value */ |
| mul8 = imag4 * imag4; |
| |
| /* store output to destination */ |
| pDst[0] = out1; |
| |
| /* accumulate real and imaginary powers */ |
| out3 = mul5 + mul6; |
| |
| /* store output to destination */ |
| pDst[1] = out2; |
| |
| /* accumulate real and imaginary powers */ |
| out4 = mul7 + mul8; |
| |
| /* store output to destination */ |
| pDst[2] = out3; |
| |
| /* increment destination pointer by 8 to process next samples */ |
| pSrc += 8u; |
| |
| /* store output to destination */ |
| pDst[3] = out4; |
| |
| /* increment destination pointer by 4 to process next samples */ |
| pDst += 4u; |
| |
| /* Decrement the loop counter */ |
| blkCnt--; |
| } |
| |
| /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
| ** No loop unrolling is used. */ |
| blkCnt = numSamples % 0x4u; |
| |
| #else |
| |
| /* Run the below code for Cortex-M0 */ |
| |
| blkCnt = numSamples; |
| |
| #endif /* #ifndef ARM_MATH_CM0_FAMILY */ |
| |
| while(blkCnt > 0u) |
| { |
| /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
| real = *pSrc++; |
| imag = *pSrc++; |
| |
| /* out = (real * real) + (imag * imag) */ |
| /* store the result in the destination buffer. */ |
| *pDst++ = (real * real) + (imag * imag); |
| |
| /* Decrement the loop counter */ |
| blkCnt--; |
| } |
| } |
| |
| /** |
| * @} end of cmplx_mag_squared group |
| */ |