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CMSIS DSP library

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cmsis_dsp/ComplexMathFunctions/arm_cmplx_mag_squared_f32.c@5:3762170b6d4d, 2015-11-20 (annotated)

Committer:
mbed_official
Date:
Fri Nov 20 08:45:18 2015 +0000
Revision:
5:3762170b6d4d
Parent:
3:7a284390b0ce 
Synchronized with git revision 2eb940b9a73af188d3004a2575fdfbb05febe62b



Full URL: https://github.com/mbedmicro/mbed/commit/2eb940b9a73af188d3004a2575fdfbb05febe62b/



Added option to build rpc library. closes #1426

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:fdd22bb7aa52 1 /* ----------------------------------------------------------------------
mbed_official 5:3762170b6d4d 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emilmont 1:fdd22bb7aa52 3 *
mbed_official 5:3762170b6d4d 4 * $Date: 19. March 2015
mbed_official 5:3762170b6d4d 5 * $Revision: V.1.4.5
emilmont 1:fdd22bb7aa52 6 *
emilmont 2:da51fb522205 7 * Project: CMSIS DSP Library
emilmont 2:da51fb522205 8 * Title: arm_cmplx_mag_squared_f32.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 2:da51fb522205 10 * Description: Floating-point complex magnitude squared.
emilmont 1:fdd22bb7aa52 11 *
emilmont 1:fdd22bb7aa52 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emilmont 1:fdd22bb7aa52 13 *
mbed_official 3:7a284390b0ce 14 * Redistribution and use in source and binary forms, with or without
mbed_official 3:7a284390b0ce 15 * modification, are permitted provided that the following conditions
mbed_official 3:7a284390b0ce 16 * are met:
mbed_official 3:7a284390b0ce 17 * - Redistributions of source code must retain the above copyright
mbed_official 3:7a284390b0ce 18 * notice, this list of conditions and the following disclaimer.
mbed_official 3:7a284390b0ce 19 * - Redistributions in binary form must reproduce the above copyright
mbed_official 3:7a284390b0ce 20 * notice, this list of conditions and the following disclaimer in
mbed_official 3:7a284390b0ce 21 * the documentation and/or other materials provided with the
mbed_official 3:7a284390b0ce 22 * distribution.
mbed_official 3:7a284390b0ce 23 * - Neither the name of ARM LIMITED nor the names of its contributors
mbed_official 3:7a284390b0ce 24 * may be used to endorse or promote products derived from this
mbed_official 3:7a284390b0ce 25 * software without specific prior written permission.
mbed_official 3:7a284390b0ce 26 *
mbed_official 3:7a284390b0ce 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
mbed_official 3:7a284390b0ce 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
mbed_official 3:7a284390b0ce 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
mbed_official 3:7a284390b0ce 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
mbed_official 3:7a284390b0ce 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
mbed_official 3:7a284390b0ce 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
mbed_official 3:7a284390b0ce 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
mbed_official 3:7a284390b0ce 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 3:7a284390b0ce 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
mbed_official 3:7a284390b0ce 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
mbed_official 3:7a284390b0ce 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbed_official 3:7a284390b0ce 38 * POSSIBILITY OF SUCH DAMAGE.
emilmont 1:fdd22bb7aa52 39 * ---------------------------------------------------------------------------- */
emilmont 1:fdd22bb7aa52 40 #include "arm_math.h"
emilmont 1:fdd22bb7aa52 41
emilmont 1:fdd22bb7aa52 42 /**
emilmont 1:fdd22bb7aa52 43 * @ingroup groupCmplxMath
emilmont 1:fdd22bb7aa52 44 */
emilmont 1:fdd22bb7aa52 45
emilmont 1:fdd22bb7aa52 46 /**
emilmont 1:fdd22bb7aa52 47 * @defgroup cmplx_mag_squared Complex Magnitude Squared
emilmont 1:fdd22bb7aa52 48 *
emilmont 1:fdd22bb7aa52 49 * Computes the magnitude squared of the elements of a complex data vector.
emilmont 1:fdd22bb7aa52 50 *
emilmont 1:fdd22bb7aa52 51 * The <code>pSrc</code> points to the source data and
emilmont 1:fdd22bb7aa52 52 * <code>pDst</code> points to the where the result should be written.
emilmont 1:fdd22bb7aa52 53 * <code>numSamples</code> specifies the number of complex samples
emilmont 1:fdd22bb7aa52 54 * in the input array and the data is stored in an interleaved fashion
emilmont 1:fdd22bb7aa52 55 * (real, imag, real, imag, ...).
emilmont 1:fdd22bb7aa52 56 * The input array has a total of <code>2*numSamples</code> values;
emilmont 1:fdd22bb7aa52 57 * the output array has a total of <code>numSamples</code> values.
emilmont 1:fdd22bb7aa52 58 *
emilmont 1:fdd22bb7aa52 59 * The underlying algorithm is used:
emilmont 1:fdd22bb7aa52 60 *
emilmont 1:fdd22bb7aa52 61 * <pre>
emilmont 1:fdd22bb7aa52 62 * for(n=0; n<numSamples; n++) {
emilmont 1:fdd22bb7aa52 63 * pDst[n] = pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2;
emilmont 1:fdd22bb7aa52 64 * }
emilmont 1:fdd22bb7aa52 65 * </pre>
emilmont 1:fdd22bb7aa52 66 *
emilmont 1:fdd22bb7aa52 67 * There are separate functions for floating-point, Q15, and Q31 data types.
emilmont 1:fdd22bb7aa52 68 */
emilmont 1:fdd22bb7aa52 69
emilmont 1:fdd22bb7aa52 70 /**
emilmont 1:fdd22bb7aa52 71 * @addtogroup cmplx_mag_squared
emilmont 1:fdd22bb7aa52 72 * @{
emilmont 1:fdd22bb7aa52 73 */
emilmont 1:fdd22bb7aa52 74
emilmont 1:fdd22bb7aa52 75
emilmont 1:fdd22bb7aa52 76 /**
emilmont 1:fdd22bb7aa52 77 * @brief Floating-point complex magnitude squared
emilmont 1:fdd22bb7aa52 78 * @param[in] *pSrc points to the complex input vector
emilmont 1:fdd22bb7aa52 79 * @param[out] *pDst points to the real output vector
emilmont 1:fdd22bb7aa52 80 * @param[in] numSamples number of complex samples in the input vector
emilmont 1:fdd22bb7aa52 81 * @return none.
emilmont 1:fdd22bb7aa52 82 */
emilmont 1:fdd22bb7aa52 83
emilmont 1:fdd22bb7aa52 84 void arm_cmplx_mag_squared_f32(
emilmont 1:fdd22bb7aa52 85 float32_t * pSrc,
emilmont 1:fdd22bb7aa52 86 float32_t * pDst,
emilmont 1:fdd22bb7aa52 87 uint32_t numSamples)
emilmont 1:fdd22bb7aa52 88 {
emilmont 1:fdd22bb7aa52 89 float32_t real, imag; /* Temporary variables to store real and imaginary values */
emilmont 1:fdd22bb7aa52 90 uint32_t blkCnt; /* loop counter */
emilmont 1:fdd22bb7aa52 91
mbed_official 3:7a284390b0ce 92 #ifndef ARM_MATH_CM0_FAMILY
emilmont 1:fdd22bb7aa52 93 float32_t real1, real2, real3, real4; /* Temporary variables to hold real values */
emilmont 1:fdd22bb7aa52 94 float32_t imag1, imag2, imag3, imag4; /* Temporary variables to hold imaginary values */
emilmont 1:fdd22bb7aa52 95 float32_t mul1, mul2, mul3, mul4; /* Temporary variables */
emilmont 1:fdd22bb7aa52 96 float32_t mul5, mul6, mul7, mul8; /* Temporary variables */
emilmont 1:fdd22bb7aa52 97 float32_t out1, out2, out3, out4; /* Temporary variables to hold output values */
emilmont 1:fdd22bb7aa52 98
emilmont 1:fdd22bb7aa52 99 /*loop Unrolling */
emilmont 1:fdd22bb7aa52 100 blkCnt = numSamples >> 2u;
emilmont 1:fdd22bb7aa52 101
emilmont 1:fdd22bb7aa52 102 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emilmont 1:fdd22bb7aa52 103 ** a second loop below computes the remaining 1 to 3 samples. */
emilmont 1:fdd22bb7aa52 104 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 105 {
emilmont 1:fdd22bb7aa52 106 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
emilmont 1:fdd22bb7aa52 107 /* read real input sample from source buffer */
emilmont 1:fdd22bb7aa52 108 real1 = pSrc[0];
emilmont 1:fdd22bb7aa52 109 /* read imaginary input sample from source buffer */
emilmont 1:fdd22bb7aa52 110 imag1 = pSrc[1];
emilmont 1:fdd22bb7aa52 111
emilmont 1:fdd22bb7aa52 112 /* calculate power of real value */
emilmont 1:fdd22bb7aa52 113 mul1 = real1 * real1;
emilmont 1:fdd22bb7aa52 114
emilmont 1:fdd22bb7aa52 115 /* read real input sample from source buffer */
emilmont 1:fdd22bb7aa52 116 real2 = pSrc[2];
emilmont 1:fdd22bb7aa52 117
emilmont 1:fdd22bb7aa52 118 /* calculate power of imaginary value */
emilmont 1:fdd22bb7aa52 119 mul2 = imag1 * imag1;
emilmont 1:fdd22bb7aa52 120
emilmont 1:fdd22bb7aa52 121 /* read imaginary input sample from source buffer */
emilmont 1:fdd22bb7aa52 122 imag2 = pSrc[3];
emilmont 1:fdd22bb7aa52 123
emilmont 1:fdd22bb7aa52 124 /* calculate power of real value */
emilmont 1:fdd22bb7aa52 125 mul3 = real2 * real2;
emilmont 1:fdd22bb7aa52 126
emilmont 1:fdd22bb7aa52 127 /* read real input sample from source buffer */
emilmont 1:fdd22bb7aa52 128 real3 = pSrc[4];
emilmont 1:fdd22bb7aa52 129
emilmont 1:fdd22bb7aa52 130 /* calculate power of imaginary value */
emilmont 1:fdd22bb7aa52 131 mul4 = imag2 * imag2;
emilmont 1:fdd22bb7aa52 132
emilmont 1:fdd22bb7aa52 133 /* read imaginary input sample from source buffer */
emilmont 1:fdd22bb7aa52 134 imag3 = pSrc[5];
emilmont 1:fdd22bb7aa52 135
emilmont 1:fdd22bb7aa52 136 /* calculate power of real value */
emilmont 1:fdd22bb7aa52 137 mul5 = real3 * real3;
emilmont 1:fdd22bb7aa52 138 /* calculate power of imaginary value */
emilmont 1:fdd22bb7aa52 139 mul6 = imag3 * imag3;
emilmont 1:fdd22bb7aa52 140
emilmont 1:fdd22bb7aa52 141 /* read real input sample from source buffer */
emilmont 1:fdd22bb7aa52 142 real4 = pSrc[6];
emilmont 1:fdd22bb7aa52 143
emilmont 1:fdd22bb7aa52 144 /* accumulate real and imaginary powers */
emilmont 1:fdd22bb7aa52 145 out1 = mul1 + mul2;
emilmont 1:fdd22bb7aa52 146
emilmont 1:fdd22bb7aa52 147 /* read imaginary input sample from source buffer */
emilmont 1:fdd22bb7aa52 148 imag4 = pSrc[7];
emilmont 1:fdd22bb7aa52 149
emilmont 1:fdd22bb7aa52 150 /* accumulate real and imaginary powers */
emilmont 1:fdd22bb7aa52 151 out2 = mul3 + mul4;
emilmont 1:fdd22bb7aa52 152
emilmont 1:fdd22bb7aa52 153 /* calculate power of real value */
emilmont 1:fdd22bb7aa52 154 mul7 = real4 * real4;
emilmont 1:fdd22bb7aa52 155 /* calculate power of imaginary value */
emilmont 1:fdd22bb7aa52 156 mul8 = imag4 * imag4;
emilmont 1:fdd22bb7aa52 157
emilmont 1:fdd22bb7aa52 158 /* store output to destination */
emilmont 1:fdd22bb7aa52 159 pDst[0] = out1;
emilmont 1:fdd22bb7aa52 160
emilmont 1:fdd22bb7aa52 161 /* accumulate real and imaginary powers */
emilmont 1:fdd22bb7aa52 162 out3 = mul5 + mul6;
emilmont 1:fdd22bb7aa52 163
emilmont 1:fdd22bb7aa52 164 /* store output to destination */
emilmont 1:fdd22bb7aa52 165 pDst[1] = out2;
emilmont 1:fdd22bb7aa52 166
emilmont 1:fdd22bb7aa52 167 /* accumulate real and imaginary powers */
emilmont 1:fdd22bb7aa52 168 out4 = mul7 + mul8;
emilmont 1:fdd22bb7aa52 169
emilmont 1:fdd22bb7aa52 170 /* store output to destination */
emilmont 1:fdd22bb7aa52 171 pDst[2] = out3;
emilmont 1:fdd22bb7aa52 172
emilmont 1:fdd22bb7aa52 173 /* increment destination pointer by 8 to process next samples */
emilmont 1:fdd22bb7aa52 174 pSrc += 8u;
emilmont 1:fdd22bb7aa52 175
emilmont 1:fdd22bb7aa52 176 /* store output to destination */
emilmont 1:fdd22bb7aa52 177 pDst[3] = out4;
emilmont 1:fdd22bb7aa52 178
emilmont 1:fdd22bb7aa52 179 /* increment destination pointer by 4 to process next samples */
emilmont 1:fdd22bb7aa52 180 pDst += 4u;
emilmont 1:fdd22bb7aa52 181
emilmont 1:fdd22bb7aa52 182 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 183 blkCnt--;
emilmont 1:fdd22bb7aa52 184 }
emilmont 1:fdd22bb7aa52 185
emilmont 1:fdd22bb7aa52 186 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
emilmont 1:fdd22bb7aa52 187 ** No loop unrolling is used. */
emilmont 1:fdd22bb7aa52 188 blkCnt = numSamples % 0x4u;
emilmont 1:fdd22bb7aa52 189
emilmont 1:fdd22bb7aa52 190 #else
emilmont 1:fdd22bb7aa52 191
emilmont 1:fdd22bb7aa52 192 /* Run the below code for Cortex-M0 */
emilmont 1:fdd22bb7aa52 193
emilmont 1:fdd22bb7aa52 194 blkCnt = numSamples;
emilmont 1:fdd22bb7aa52 195
mbed_official 3:7a284390b0ce 196 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emilmont 1:fdd22bb7aa52 197
emilmont 1:fdd22bb7aa52 198 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 199 {
emilmont 1:fdd22bb7aa52 200 /* C[0] = (A[0] * A[0] + A[1] * A[1]) */
emilmont 1:fdd22bb7aa52 201 real = *pSrc++;
emilmont 1:fdd22bb7aa52 202 imag = *pSrc++;
emilmont 1:fdd22bb7aa52 203
emilmont 1:fdd22bb7aa52 204 /* out = (real * real) + (imag * imag) */
emilmont 1:fdd22bb7aa52 205 /* store the result in the destination buffer. */
emilmont 1:fdd22bb7aa52 206 *pDst++ = (real * real) + (imag * imag);
emilmont 1:fdd22bb7aa52 207
emilmont 1:fdd22bb7aa52 208 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 209 blkCnt--;
emilmont 1:fdd22bb7aa52 210 }
emilmont 1:fdd22bb7aa52 211 }
emilmont 1:fdd22bb7aa52 212
emilmont 1:fdd22bb7aa52 213 /**
emilmont 1:fdd22bb7aa52 214 * @} end of cmplx_mag_squared group
emilmont 1:fdd22bb7aa52 215 */