Laxmi Kant Tiwari / mbed-dsp

CMSIS DSP Lib

Fork of mbed-dsp by mbed official

cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_f32.c@4:9cee975aadce, 2014-06-23 (annotated)

Committer:
mbed_official
Date:
Mon Jun 23 09:30:09 2014 +0100
Revision:
4:9cee975aadce
Parent:
3:7a284390b0ce 
Synchronized with git revision 6e7c7bcec41226f536474daae3c13d49e4c0e865



Full URL: https://github.com/mbedmicro/mbed/commit/6e7c7bcec41226f536474daae3c13d49e4c0e865/



Fix signed unsigned compare in dsp library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:fdd22bb7aa52 1 /* ----------------------------------------------------------------------
mbed_official 3:7a284390b0ce 2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
emilmont 1:fdd22bb7aa52 3 *
mbed_official 3:7a284390b0ce 4 * $Date: 17. January 2013
mbed_official 3:7a284390b0ce 5 * $Revision: V1.4.1
emilmont 1:fdd22bb7aa52 6 *
emilmont 2:da51fb522205 7 * Project: CMSIS DSP Library
emilmont 2:da51fb522205 8 * Title: arm_cmplx_conj_f32.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 2:da51fb522205 10 * Description: Floating-point complex conjugate.
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_conj Complex Conjugate
emilmont 1:fdd22bb7aa52 48 *
emilmont 1:fdd22bb7aa52 49 * Conjugates 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 * and the data in each array is stored in an interleaved fashion
emilmont 1:fdd22bb7aa52 55 * (real, imag, real, imag, ...).
emilmont 1:fdd22bb7aa52 56 * Each array has a total of <code>2*numSamples</code> values.
emilmont 1:fdd22bb7aa52 57 * The underlying algorithm is used:
emilmont 1:fdd22bb7aa52 58 *
emilmont 1:fdd22bb7aa52 59 * <pre>
emilmont 1:fdd22bb7aa52 60 * for(n=0; n<numSamples; n++) {
emilmont 1:fdd22bb7aa52 61 * pDst[(2*n)+0)] = pSrc[(2*n)+0]; // real part
emilmont 1:fdd22bb7aa52 62 * pDst[(2*n)+1)] = -pSrc[(2*n)+1]; // imag part
emilmont 1:fdd22bb7aa52 63 * }
emilmont 1:fdd22bb7aa52 64 * </pre>
emilmont 1:fdd22bb7aa52 65 *
emilmont 1:fdd22bb7aa52 66 * There are separate functions for floating-point, Q15, and Q31 data types.
emilmont 1:fdd22bb7aa52 67 */
emilmont 1:fdd22bb7aa52 68
emilmont 1:fdd22bb7aa52 69 /**
emilmont 1:fdd22bb7aa52 70 * @addtogroup cmplx_conj
emilmont 1:fdd22bb7aa52 71 * @{
emilmont 1:fdd22bb7aa52 72 */
emilmont 1:fdd22bb7aa52 73
emilmont 1:fdd22bb7aa52 74 /**
emilmont 1:fdd22bb7aa52 75 * @brief Floating-point complex conjugate.
emilmont 1:fdd22bb7aa52 76 * @param *pSrc points to the input vector
emilmont 1:fdd22bb7aa52 77 * @param *pDst points to the output vector
emilmont 1:fdd22bb7aa52 78 * @param numSamples number of complex samples in each vector
emilmont 1:fdd22bb7aa52 79 * @return none.
emilmont 1:fdd22bb7aa52 80 */
emilmont 1:fdd22bb7aa52 81
emilmont 1:fdd22bb7aa52 82 void arm_cmplx_conj_f32(
emilmont 1:fdd22bb7aa52 83 float32_t * pSrc,
emilmont 1:fdd22bb7aa52 84 float32_t * pDst,
emilmont 1:fdd22bb7aa52 85 uint32_t numSamples)
emilmont 1:fdd22bb7aa52 86 {
emilmont 1:fdd22bb7aa52 87 uint32_t blkCnt; /* loop counter */
emilmont 1:fdd22bb7aa52 88
mbed_official 3:7a284390b0ce 89 #ifndef ARM_MATH_CM0_FAMILY
emilmont 1:fdd22bb7aa52 90
emilmont 1:fdd22bb7aa52 91 /* Run the below code for Cortex-M4 and Cortex-M3 */
emilmont 1:fdd22bb7aa52 92 float32_t inR1, inR2, inR3, inR4;
emilmont 1:fdd22bb7aa52 93 float32_t inI1, inI2, inI3, inI4;
emilmont 1:fdd22bb7aa52 94
emilmont 1:fdd22bb7aa52 95 /*loop Unrolling */
emilmont 1:fdd22bb7aa52 96 blkCnt = numSamples >> 2u;
emilmont 1:fdd22bb7aa52 97
emilmont 1:fdd22bb7aa52 98 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emilmont 1:fdd22bb7aa52 99 ** a second loop below computes the remaining 1 to 3 samples. */
emilmont 1:fdd22bb7aa52 100 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 101 {
emilmont 1:fdd22bb7aa52 102 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
emilmont 1:fdd22bb7aa52 103 /* Calculate Complex Conjugate and then store the results in the destination buffer. */
emilmont 1:fdd22bb7aa52 104 /* read real input samples */
emilmont 1:fdd22bb7aa52 105 inR1 = pSrc[0];
emilmont 1:fdd22bb7aa52 106 /* store real samples to destination */
emilmont 1:fdd22bb7aa52 107 pDst[0] = inR1;
emilmont 1:fdd22bb7aa52 108 inR2 = pSrc[2];
emilmont 1:fdd22bb7aa52 109 pDst[2] = inR2;
emilmont 1:fdd22bb7aa52 110 inR3 = pSrc[4];
emilmont 1:fdd22bb7aa52 111 pDst[4] = inR3;
emilmont 1:fdd22bb7aa52 112 inR4 = pSrc[6];
emilmont 1:fdd22bb7aa52 113 pDst[6] = inR4;
emilmont 1:fdd22bb7aa52 114
emilmont 1:fdd22bb7aa52 115 /* read imaginary input samples */
emilmont 1:fdd22bb7aa52 116 inI1 = pSrc[1];
emilmont 1:fdd22bb7aa52 117 inI2 = pSrc[3];
emilmont 1:fdd22bb7aa52 118
emilmont 1:fdd22bb7aa52 119 /* conjugate input */
emilmont 1:fdd22bb7aa52 120 inI1 = -inI1;
emilmont 1:fdd22bb7aa52 121
emilmont 1:fdd22bb7aa52 122 /* read imaginary input samples */
emilmont 1:fdd22bb7aa52 123 inI3 = pSrc[5];
emilmont 1:fdd22bb7aa52 124
emilmont 1:fdd22bb7aa52 125 /* conjugate input */
emilmont 1:fdd22bb7aa52 126 inI2 = -inI2;
emilmont 1:fdd22bb7aa52 127
emilmont 1:fdd22bb7aa52 128 /* read imaginary input samples */
emilmont 1:fdd22bb7aa52 129 inI4 = pSrc[7];
emilmont 1:fdd22bb7aa52 130
emilmont 1:fdd22bb7aa52 131 /* conjugate input */
emilmont 1:fdd22bb7aa52 132 inI3 = -inI3;
emilmont 1:fdd22bb7aa52 133
emilmont 1:fdd22bb7aa52 134 /* store imaginary samples to destination */
emilmont 1:fdd22bb7aa52 135 pDst[1] = inI1;
emilmont 1:fdd22bb7aa52 136 pDst[3] = inI2;
emilmont 1:fdd22bb7aa52 137
emilmont 1:fdd22bb7aa52 138 /* conjugate input */
emilmont 1:fdd22bb7aa52 139 inI4 = -inI4;
emilmont 1:fdd22bb7aa52 140
emilmont 1:fdd22bb7aa52 141 /* store imaginary samples to destination */
emilmont 1:fdd22bb7aa52 142 pDst[5] = inI3;
emilmont 1:fdd22bb7aa52 143
emilmont 1:fdd22bb7aa52 144 /* increment source pointer by 8 to process next sampels */
emilmont 1:fdd22bb7aa52 145 pSrc += 8u;
emilmont 1:fdd22bb7aa52 146
emilmont 1:fdd22bb7aa52 147 /* store imaginary sample to destination */
emilmont 1:fdd22bb7aa52 148 pDst[7] = inI4;
emilmont 1:fdd22bb7aa52 149
emilmont 1:fdd22bb7aa52 150 /* increment destination pointer by 8 to store next samples */
emilmont 1:fdd22bb7aa52 151 pDst += 8u;
emilmont 1:fdd22bb7aa52 152
emilmont 1:fdd22bb7aa52 153 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 154 blkCnt--;
emilmont 1:fdd22bb7aa52 155 }
emilmont 1:fdd22bb7aa52 156
emilmont 1:fdd22bb7aa52 157 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
emilmont 1:fdd22bb7aa52 158 ** No loop unrolling is used. */
emilmont 1:fdd22bb7aa52 159 blkCnt = numSamples % 0x4u;
emilmont 1:fdd22bb7aa52 160
emilmont 1:fdd22bb7aa52 161 #else
emilmont 1:fdd22bb7aa52 162
emilmont 1:fdd22bb7aa52 163 /* Run the below code for Cortex-M0 */
emilmont 1:fdd22bb7aa52 164 blkCnt = numSamples;
emilmont 1:fdd22bb7aa52 165
mbed_official 3:7a284390b0ce 166 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emilmont 1:fdd22bb7aa52 167
emilmont 1:fdd22bb7aa52 168 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 169 {
emilmont 1:fdd22bb7aa52 170 /* realOut + j (imagOut) = realIn + j (-1) imagIn */
emilmont 1:fdd22bb7aa52 171 /* Calculate Complex Conjugate and then store the results in the destination buffer. */
emilmont 1:fdd22bb7aa52 172 *pDst++ = *pSrc++;
emilmont 1:fdd22bb7aa52 173 *pDst++ = -*pSrc++;
emilmont 1:fdd22bb7aa52 174
emilmont 1:fdd22bb7aa52 175 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 176 blkCnt--;
emilmont 1:fdd22bb7aa52 177 }
emilmont 1:fdd22bb7aa52 178 }
emilmont 1:fdd22bb7aa52 179
emilmont 1:fdd22bb7aa52 180 /**
emilmont 1:fdd22bb7aa52 181 * @} end of cmplx_conj group
emilmont 1:fdd22bb7aa52 182 */