| /* ---------------------------------------------------------------------- |
| * Copyright (C) 2010 ARM Limited. All rights reserved. |
| * |
| * $Date: 15. July 2011 |
| * $Revision: V1.0.10 |
| * |
| * Project: CMSIS DSP Library |
| * Title: arm_cmplx_mag_squared_q31.c |
| * |
| * Description: Q31 complex magnitude squared. |
| * |
| * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
| * |
| * Version 1.0.10 2011/7/15 |
| * Big Endian support added and Merged M0 and M3/M4 Source code. |
| * |
| * Version 1.0.3 2010/11/29 |
| * Re-organized the CMSIS folders and updated documentation. |
| * |
| * Version 1.0.2 2010/11/11 |
| * Documentation updated. |
| * |
| * Version 1.0.1 2010/10/05 |
| * Production release and review comments incorporated. |
| * |
| * Version 1.0.0 2010/09/20 |
| * Production release and review comments incorporated. |
| * ---------------------------------------------------------------------------- */ |
| |
| #include "arm_math.h" |
| |
| /** |
| * @ingroup groupCmplxMath |
| */ |
| |
| /** |
| * @addtogroup cmplx_mag_squared |
| * @{ |
| */ |
| |
| |
| /** |
| * @brief Q31 complex magnitude squared |
| * @param *pSrc points to the complex input vector |
| * @param *pDst points to the real output vector |
| * @param numSamples number of complex samples in the input vector |
| * @return none. |
| * |
| * <b>Scaling and Overflow Behavior:</b> |
| * \par |
| * The function implements 1.31 by 1.31 multiplications and finally output is converted into 3.29 format. |
| * Input down scaling is not required. |
| */ |
| |
| void arm_cmplx_mag_squared_q31( |
| q31_t * pSrc, |
| q31_t * pDst, |
| uint32_t numSamples) |
| { |
| q31_t real, imag; /* Temporary variables to store real and imaginary values */ |
| q31_t acc0, acc1; /* Accumulators */ |
| |
| #ifndef ARM_MATH_CM0 |
| |
| /* Run the below code for Cortex-M4 and Cortex-M3 */ |
| uint32_t blkCnt; /* loop counter */ |
| |
| /* 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]) */ |
| real = *pSrc++; |
| imag = *pSrc++; |
| acc0 = (q31_t) (((q63_t) real * real) >> 33); |
| acc1 = (q31_t) (((q63_t) imag * imag) >> 33); |
| /* store the result in 3.29 format in the destination buffer. */ |
| *pDst++ = acc0 + acc1; |
| |
| real = *pSrc++; |
| imag = *pSrc++; |
| acc0 = (q31_t) (((q63_t) real * real) >> 33); |
| acc1 = (q31_t) (((q63_t) imag * imag) >> 33); |
| /* store the result in 3.29 format in the destination buffer. */ |
| *pDst++ = acc0 + acc1; |
| |
| real = *pSrc++; |
| imag = *pSrc++; |
| acc0 = (q31_t) (((q63_t) real * real) >> 33); |
| acc1 = (q31_t) (((q63_t) imag * imag) >> 33); |
| /* store the result in 3.29 format in the destination buffer. */ |
| *pDst++ = acc0 + acc1; |
| |
| real = *pSrc++; |
| imag = *pSrc++; |
| acc0 = (q31_t) (((q63_t) real * real) >> 33); |
| acc1 = (q31_t) (((q63_t) imag * imag) >> 33); |
| /* store the result in 3.29 format in the destination buffer. */ |
| *pDst++ = acc0 + acc1; |
| |
| /* 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; |
| |
| while(blkCnt > 0u) |
| { |
| /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
| real = *pSrc++; |
| imag = *pSrc++; |
| acc0 = (q31_t) (((q63_t) real * real) >> 33); |
| acc1 = (q31_t) (((q63_t) imag * imag) >> 33); |
| /* store the result in 3.29 format in the destination buffer. */ |
| *pDst++ = acc0 + acc1; |
| |
| /* Decrement the loop counter */ |
| blkCnt--; |
| } |
| |
| #else |
| |
| /* Run the below code for Cortex-M0 */ |
| |
| while(numSamples > 0u) |
| { |
| /* out = ((real * real) + (imag * imag)) */ |
| real = *pSrc++; |
| imag = *pSrc++; |
| acc0 = (q31_t) (((q63_t) real * real) >> 33); |
| acc1 = (q31_t) (((q63_t) imag * imag) >> 33); |
| /* store the result in 3.29 format in the destination buffer. */ |
| *pDst++ = acc0 + acc1; |
| |
| /* Decrement the loop counter */ |
| numSamples--; |
| } |
| |
| #endif /* #ifndef ARM_MATH_CM0 */ |
| |
| } |
| |
| /** |
| * @} end of cmplx_mag_squared group |
| */ |