CMSIS DSP Software Library: arm_cmplx_mag_squared_q31.c Source File
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arm_cmplx_mag_squared_q31.c
Go to the documentation of this file.00001 /* ----------------------------------------------------------------------
00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
00003 *
00004 * $Date: 29. November 2010
00005 * $Revision: V1.0.3
00006 *
00007 * Project: CMSIS DSP Library
00008 * Title: arm_cmplx_mag_squared_q31.c
00009 *
00010 * Description: Q31 complex magnitude squared.
00011 *
00012 * Target Processor: Cortex-M4/Cortex-M3
00013 *
00014 * Version 1.0.3 2010/11/29
00015 * Re-organized the CMSIS folders and updated documentation.
00016 *
00017 * Version 1.0.2 2010/11/11
00018 * Documentation updated.
00019 *
00020 * Version 1.0.1 2010/10/05
00021 * Production release and review comments incorporated.
00022 *
00023 * Version 1.0.0 2010/09/20
00024 * Production release and review comments incorporated.
00025 * ---------------------------------------------------------------------------- */
00026
00027 #include "arm_math.h"
00028
00052 void arm_cmplx_mag_squared_q31(
00053 q31_t * pSrc,
00054 q31_t * pDst,
00055 uint32_t numSamples)
00056 {
00057 q31_t real, imag; /* Temporary variables to store real and imaginary values */
00058 q31_t acc0, acc1; /* Accumulators */
00059 uint32_t blkCnt; /* loop counter */
00060
00061 /* loop Unrolling */
00062 blkCnt = numSamples >> 2u;
00063
00064 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
00065 ** a second loop below computes the remaining 1 to 3 samples. */
00066 while(blkCnt > 0u)
00067 {
00068 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
00069 real = *pSrc++;
00070 imag = *pSrc++;
00071 acc0 = (q31_t) (((q63_t) real * real) >> 33);
00072 acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
00073 /* store the result in 3.29 format in the destination buffer. */
00074 *pDst++ = acc0 + acc1;
00075
00076 real = *pSrc++;
00077 imag = *pSrc++;
00078 acc0 = (q31_t) (((q63_t) real * real) >> 33);
00079 acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
00080 /* store the result in 3.29 format in the destination buffer. */
00081 *pDst++ = acc0 + acc1;
00082
00083 real = *pSrc++;
00084 imag = *pSrc++;
00085 acc0 = (q31_t) (((q63_t) real * real) >> 33);
00086 acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
00087 /* store the result in 3.29 format in the destination buffer. */
00088 *pDst++ = acc0 + acc1;
00089
00090 real = *pSrc++;
00091 imag = *pSrc++;
00092 acc0 = (q31_t) (((q63_t) real * real) >> 33);
00093 acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
00094 /* store the result in 3.29 format in the destination buffer. */
00095 *pDst++ = acc0 + acc1;
00096
00097 /* Decrement the loop counter */
00098 blkCnt--;
00099 }
00100
00101 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
00102 ** No loop unrolling is used. */
00103 blkCnt = numSamples % 0x4u;
00104
00105 while(blkCnt > 0u)
00106 {
00107 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
00108 real = *pSrc++;
00109 imag = *pSrc++;
00110 acc0 = (q31_t) (((q63_t) real * real) >> 33);
00111 acc1 = (q31_t) (((q63_t) imag * imag) >> 33);
00112 /* store the result in 3.29 format in the destination buffer. */
00113 *pDst++ = acc0 + acc1;
00114
00115 /* Decrement the loop counter */
00116 blkCnt--;
00117 }
00118 }
00119
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