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functions/ComplexMathFunctions/arm_cmplx_conj_q31.c@3:4098b9d3d571, 2018-06-21 (annotated)
- Committer:
- xorjoep
- Date:
- Thu Jun 21 11:56:27 2018 +0000
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
headers is a folder not a library
Who changed what in which revision?
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xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_cmplx_conj_q31.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Q31 complex conjugate |
xorjoep | 1:24714b45cd1b | 5 | * |
xorjoep | 1:24714b45cd1b | 6 | * $Date: 27. January 2017 |
xorjoep | 1:24714b45cd1b | 7 | * $Revision: V.1.5.1 |
xorjoep | 1:24714b45cd1b | 8 | * |
xorjoep | 1:24714b45cd1b | 9 | * Target Processor: Cortex-M cores |
xorjoep | 1:24714b45cd1b | 10 | * -------------------------------------------------------------------- */ |
xorjoep | 1:24714b45cd1b | 11 | /* |
xorjoep | 1:24714b45cd1b | 12 | * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. |
xorjoep | 1:24714b45cd1b | 13 | * |
xorjoep | 1:24714b45cd1b | 14 | * SPDX-License-Identifier: Apache-2.0 |
xorjoep | 1:24714b45cd1b | 15 | * |
xorjoep | 1:24714b45cd1b | 16 | * Licensed under the Apache License, Version 2.0 (the License); you may |
xorjoep | 1:24714b45cd1b | 17 | * not use this file except in compliance with the License. |
xorjoep | 1:24714b45cd1b | 18 | * You may obtain a copy of the License at |
xorjoep | 1:24714b45cd1b | 19 | * |
xorjoep | 1:24714b45cd1b | 20 | * www.apache.org/licenses/LICENSE-2.0 |
xorjoep | 1:24714b45cd1b | 21 | * |
xorjoep | 1:24714b45cd1b | 22 | * Unless required by applicable law or agreed to in writing, software |
xorjoep | 1:24714b45cd1b | 23 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
xorjoep | 1:24714b45cd1b | 24 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
xorjoep | 1:24714b45cd1b | 25 | * See the License for the specific language governing permissions and |
xorjoep | 1:24714b45cd1b | 26 | * limitations under the License. |
xorjoep | 1:24714b45cd1b | 27 | */ |
xorjoep | 1:24714b45cd1b | 28 | |
xorjoep | 1:24714b45cd1b | 29 | #include "arm_math.h" |
xorjoep | 1:24714b45cd1b | 30 | |
xorjoep | 1:24714b45cd1b | 31 | /** |
xorjoep | 1:24714b45cd1b | 32 | * @ingroup groupCmplxMath |
xorjoep | 1:24714b45cd1b | 33 | */ |
xorjoep | 1:24714b45cd1b | 34 | |
xorjoep | 1:24714b45cd1b | 35 | /** |
xorjoep | 1:24714b45cd1b | 36 | * @addtogroup cmplx_conj |
xorjoep | 1:24714b45cd1b | 37 | * @{ |
xorjoep | 1:24714b45cd1b | 38 | */ |
xorjoep | 1:24714b45cd1b | 39 | |
xorjoep | 1:24714b45cd1b | 40 | /** |
xorjoep | 1:24714b45cd1b | 41 | * @brief Q31 complex conjugate. |
xorjoep | 1:24714b45cd1b | 42 | * @param *pSrc points to the input vector |
xorjoep | 1:24714b45cd1b | 43 | * @param *pDst points to the output vector |
xorjoep | 1:24714b45cd1b | 44 | * @param numSamples number of complex samples in each vector |
xorjoep | 1:24714b45cd1b | 45 | * @return none. |
xorjoep | 1:24714b45cd1b | 46 | * |
xorjoep | 1:24714b45cd1b | 47 | * <b>Scaling and Overflow Behavior:</b> |
xorjoep | 1:24714b45cd1b | 48 | * \par |
xorjoep | 1:24714b45cd1b | 49 | * The function uses saturating arithmetic. |
xorjoep | 1:24714b45cd1b | 50 | * The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF. |
xorjoep | 1:24714b45cd1b | 51 | */ |
xorjoep | 1:24714b45cd1b | 52 | |
xorjoep | 1:24714b45cd1b | 53 | void arm_cmplx_conj_q31( |
xorjoep | 1:24714b45cd1b | 54 | q31_t * pSrc, |
xorjoep | 1:24714b45cd1b | 55 | q31_t * pDst, |
xorjoep | 1:24714b45cd1b | 56 | uint32_t numSamples) |
xorjoep | 1:24714b45cd1b | 57 | { |
xorjoep | 1:24714b45cd1b | 58 | uint32_t blkCnt; /* loop counter */ |
xorjoep | 1:24714b45cd1b | 59 | q31_t in; /* Input value */ |
xorjoep | 1:24714b45cd1b | 60 | |
xorjoep | 1:24714b45cd1b | 61 | #if defined (ARM_MATH_DSP) |
xorjoep | 1:24714b45cd1b | 62 | |
xorjoep | 1:24714b45cd1b | 63 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
xorjoep | 1:24714b45cd1b | 64 | q31_t inR1, inR2, inR3, inR4; /* Temporary real variables */ |
xorjoep | 1:24714b45cd1b | 65 | q31_t inI1, inI2, inI3, inI4; /* Temporary imaginary variables */ |
xorjoep | 1:24714b45cd1b | 66 | |
xorjoep | 1:24714b45cd1b | 67 | /*loop Unrolling */ |
xorjoep | 1:24714b45cd1b | 68 | blkCnt = numSamples >> 2U; |
xorjoep | 1:24714b45cd1b | 69 | |
xorjoep | 1:24714b45cd1b | 70 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
xorjoep | 1:24714b45cd1b | 71 | ** a second loop below computes the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 72 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 73 | { |
xorjoep | 1:24714b45cd1b | 74 | /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ |
xorjoep | 1:24714b45cd1b | 75 | /* Calculate Complex Conjugate and then store the results in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 76 | /* Saturated to 0x7fffffff if the input is -1(0x80000000) */ |
xorjoep | 1:24714b45cd1b | 77 | /* read real input sample */ |
xorjoep | 1:24714b45cd1b | 78 | inR1 = pSrc[0]; |
xorjoep | 1:24714b45cd1b | 79 | /* store real input sample */ |
xorjoep | 1:24714b45cd1b | 80 | pDst[0] = inR1; |
xorjoep | 1:24714b45cd1b | 81 | |
xorjoep | 1:24714b45cd1b | 82 | /* read imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 83 | inI1 = pSrc[1]; |
xorjoep | 1:24714b45cd1b | 84 | |
xorjoep | 1:24714b45cd1b | 85 | /* read real input sample */ |
xorjoep | 1:24714b45cd1b | 86 | inR2 = pSrc[2]; |
xorjoep | 1:24714b45cd1b | 87 | /* store real input sample */ |
xorjoep | 1:24714b45cd1b | 88 | pDst[2] = inR2; |
xorjoep | 1:24714b45cd1b | 89 | |
xorjoep | 1:24714b45cd1b | 90 | /* read imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 91 | inI2 = pSrc[3]; |
xorjoep | 1:24714b45cd1b | 92 | |
xorjoep | 1:24714b45cd1b | 93 | /* negate imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 94 | inI1 = __QSUB(0, inI1); |
xorjoep | 1:24714b45cd1b | 95 | |
xorjoep | 1:24714b45cd1b | 96 | /* read real input sample */ |
xorjoep | 1:24714b45cd1b | 97 | inR3 = pSrc[4]; |
xorjoep | 1:24714b45cd1b | 98 | /* store real input sample */ |
xorjoep | 1:24714b45cd1b | 99 | pDst[4] = inR3; |
xorjoep | 1:24714b45cd1b | 100 | |
xorjoep | 1:24714b45cd1b | 101 | /* read imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 102 | inI3 = pSrc[5]; |
xorjoep | 1:24714b45cd1b | 103 | |
xorjoep | 1:24714b45cd1b | 104 | /* negate imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 105 | inI2 = __QSUB(0, inI2); |
xorjoep | 1:24714b45cd1b | 106 | |
xorjoep | 1:24714b45cd1b | 107 | /* read real input sample */ |
xorjoep | 1:24714b45cd1b | 108 | inR4 = pSrc[6]; |
xorjoep | 1:24714b45cd1b | 109 | /* store real input sample */ |
xorjoep | 1:24714b45cd1b | 110 | pDst[6] = inR4; |
xorjoep | 1:24714b45cd1b | 111 | |
xorjoep | 1:24714b45cd1b | 112 | /* negate imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 113 | inI3 = __QSUB(0, inI3); |
xorjoep | 1:24714b45cd1b | 114 | |
xorjoep | 1:24714b45cd1b | 115 | /* store imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 116 | inI4 = pSrc[7]; |
xorjoep | 1:24714b45cd1b | 117 | |
xorjoep | 1:24714b45cd1b | 118 | /* store imaginary input samples */ |
xorjoep | 1:24714b45cd1b | 119 | pDst[1] = inI1; |
xorjoep | 1:24714b45cd1b | 120 | |
xorjoep | 1:24714b45cd1b | 121 | /* negate imaginary input sample */ |
xorjoep | 1:24714b45cd1b | 122 | inI4 = __QSUB(0, inI4); |
xorjoep | 1:24714b45cd1b | 123 | |
xorjoep | 1:24714b45cd1b | 124 | /* store imaginary input samples */ |
xorjoep | 1:24714b45cd1b | 125 | pDst[3] = inI2; |
xorjoep | 1:24714b45cd1b | 126 | |
xorjoep | 1:24714b45cd1b | 127 | /* increment source pointer by 8 to proecess next samples */ |
xorjoep | 1:24714b45cd1b | 128 | pSrc += 8U; |
xorjoep | 1:24714b45cd1b | 129 | |
xorjoep | 1:24714b45cd1b | 130 | /* store imaginary input samples */ |
xorjoep | 1:24714b45cd1b | 131 | pDst[5] = inI3; |
xorjoep | 1:24714b45cd1b | 132 | pDst[7] = inI4; |
xorjoep | 1:24714b45cd1b | 133 | |
xorjoep | 1:24714b45cd1b | 134 | /* increment destination pointer by 8 to process next samples */ |
xorjoep | 1:24714b45cd1b | 135 | pDst += 8U; |
xorjoep | 1:24714b45cd1b | 136 | |
xorjoep | 1:24714b45cd1b | 137 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 138 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 139 | } |
xorjoep | 1:24714b45cd1b | 140 | |
xorjoep | 1:24714b45cd1b | 141 | /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 142 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 143 | blkCnt = numSamples % 0x4U; |
xorjoep | 1:24714b45cd1b | 144 | |
xorjoep | 1:24714b45cd1b | 145 | #else |
xorjoep | 1:24714b45cd1b | 146 | |
xorjoep | 1:24714b45cd1b | 147 | /* Run the below code for Cortex-M0 */ |
xorjoep | 1:24714b45cd1b | 148 | blkCnt = numSamples; |
xorjoep | 1:24714b45cd1b | 149 | |
xorjoep | 1:24714b45cd1b | 150 | |
xorjoep | 1:24714b45cd1b | 151 | #endif /* #if defined (ARM_MATH_DSP) */ |
xorjoep | 1:24714b45cd1b | 152 | |
xorjoep | 1:24714b45cd1b | 153 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 154 | { |
xorjoep | 1:24714b45cd1b | 155 | /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ |
xorjoep | 1:24714b45cd1b | 156 | /* Calculate Complex Conjugate and then store the results in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 157 | /* Saturated to 0x7fffffff if the input is -1(0x80000000) */ |
xorjoep | 1:24714b45cd1b | 158 | *pDst++ = *pSrc++; |
xorjoep | 1:24714b45cd1b | 159 | in = *pSrc++; |
xorjoep | 1:24714b45cd1b | 160 | *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; |
xorjoep | 1:24714b45cd1b | 161 | |
xorjoep | 1:24714b45cd1b | 162 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 163 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 164 | } |
xorjoep | 1:24714b45cd1b | 165 | } |
xorjoep | 1:24714b45cd1b | 166 | |
xorjoep | 1:24714b45cd1b | 167 | /** |
xorjoep | 1:24714b45cd1b | 168 | * @} end of cmplx_conj group |
xorjoep | 1:24714b45cd1b | 169 | */ |