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Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_squared_f32.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_squared_f32.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_squared_f32.c b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_squared_f32.c new file mode 100644 index 0000000..536f11d --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mag_squared_f32.c @@ -0,0 +1,215 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 12. March 2014 +* $Revision: V1.4.4 +* +* 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 + */ |