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functions/ComplexMathFunctions/arm_cmplx_mag_squared_q15.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?
User | Revision | Line number | New contents of line |
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xorjoep | 1:24714b45cd1b | 1 | /* ---------------------------------------------------------------------- |
xorjoep | 1:24714b45cd1b | 2 | * Project: CMSIS DSP Library |
xorjoep | 1:24714b45cd1b | 3 | * Title: arm_cmplx_mag_squared_q15.c |
xorjoep | 1:24714b45cd1b | 4 | * Description: Q15 complex magnitude squared |
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_mag_squared |
xorjoep | 1:24714b45cd1b | 37 | * @{ |
xorjoep | 1:24714b45cd1b | 38 | */ |
xorjoep | 1:24714b45cd1b | 39 | |
xorjoep | 1:24714b45cd1b | 40 | /** |
xorjoep | 1:24714b45cd1b | 41 | * @brief Q15 complex magnitude squared |
xorjoep | 1:24714b45cd1b | 42 | * @param *pSrc points to the complex input vector |
xorjoep | 1:24714b45cd1b | 43 | * @param *pDst points to the real output vector |
xorjoep | 1:24714b45cd1b | 44 | * @param numSamples number of complex samples in the input 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 implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format. |
xorjoep | 1:24714b45cd1b | 50 | */ |
xorjoep | 1:24714b45cd1b | 51 | |
xorjoep | 1:24714b45cd1b | 52 | void arm_cmplx_mag_squared_q15( |
xorjoep | 1:24714b45cd1b | 53 | q15_t * pSrc, |
xorjoep | 1:24714b45cd1b | 54 | q15_t * pDst, |
xorjoep | 1:24714b45cd1b | 55 | uint32_t numSamples) |
xorjoep | 1:24714b45cd1b | 56 | { |
xorjoep | 1:24714b45cd1b | 57 | q31_t acc0, acc1; /* Accumulators */ |
xorjoep | 1:24714b45cd1b | 58 | |
xorjoep | 1:24714b45cd1b | 59 | #if defined (ARM_MATH_DSP) |
xorjoep | 1:24714b45cd1b | 60 | |
xorjoep | 1:24714b45cd1b | 61 | /* Run the below code for Cortex-M4 and Cortex-M3 */ |
xorjoep | 1:24714b45cd1b | 62 | uint32_t blkCnt; /* loop counter */ |
xorjoep | 1:24714b45cd1b | 63 | q31_t in1, in2, in3, in4; |
xorjoep | 1:24714b45cd1b | 64 | q31_t acc2, acc3; |
xorjoep | 1:24714b45cd1b | 65 | |
xorjoep | 1:24714b45cd1b | 66 | /*loop Unrolling */ |
xorjoep | 1:24714b45cd1b | 67 | blkCnt = numSamples >> 2U; |
xorjoep | 1:24714b45cd1b | 68 | |
xorjoep | 1:24714b45cd1b | 69 | /* First part of the processing with loop unrolling. Compute 4 outputs at a time. |
xorjoep | 1:24714b45cd1b | 70 | ** a second loop below computes the remaining 1 to 3 samples. */ |
xorjoep | 1:24714b45cd1b | 71 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 72 | { |
xorjoep | 1:24714b45cd1b | 73 | /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
xorjoep | 1:24714b45cd1b | 74 | in1 = *__SIMD32(pSrc)++; |
xorjoep | 1:24714b45cd1b | 75 | in2 = *__SIMD32(pSrc)++; |
xorjoep | 1:24714b45cd1b | 76 | in3 = *__SIMD32(pSrc)++; |
xorjoep | 1:24714b45cd1b | 77 | in4 = *__SIMD32(pSrc)++; |
xorjoep | 1:24714b45cd1b | 78 | |
xorjoep | 1:24714b45cd1b | 79 | acc0 = __SMUAD(in1, in1); |
xorjoep | 1:24714b45cd1b | 80 | acc1 = __SMUAD(in2, in2); |
xorjoep | 1:24714b45cd1b | 81 | acc2 = __SMUAD(in3, in3); |
xorjoep | 1:24714b45cd1b | 82 | acc3 = __SMUAD(in4, in4); |
xorjoep | 1:24714b45cd1b | 83 | |
xorjoep | 1:24714b45cd1b | 84 | /* store the result in 3.13 format in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 85 | *pDst++ = (q15_t) (acc0 >> 17); |
xorjoep | 1:24714b45cd1b | 86 | *pDst++ = (q15_t) (acc1 >> 17); |
xorjoep | 1:24714b45cd1b | 87 | *pDst++ = (q15_t) (acc2 >> 17); |
xorjoep | 1:24714b45cd1b | 88 | *pDst++ = (q15_t) (acc3 >> 17); |
xorjoep | 1:24714b45cd1b | 89 | |
xorjoep | 1:24714b45cd1b | 90 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 91 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 92 | } |
xorjoep | 1:24714b45cd1b | 93 | |
xorjoep | 1:24714b45cd1b | 94 | /* If the numSamples is not a multiple of 4, compute any remaining output samples here. |
xorjoep | 1:24714b45cd1b | 95 | ** No loop unrolling is used. */ |
xorjoep | 1:24714b45cd1b | 96 | blkCnt = numSamples % 0x4U; |
xorjoep | 1:24714b45cd1b | 97 | |
xorjoep | 1:24714b45cd1b | 98 | while (blkCnt > 0U) |
xorjoep | 1:24714b45cd1b | 99 | { |
xorjoep | 1:24714b45cd1b | 100 | /* C[0] = (A[0] * A[0] + A[1] * A[1]) */ |
xorjoep | 1:24714b45cd1b | 101 | in1 = *__SIMD32(pSrc)++; |
xorjoep | 1:24714b45cd1b | 102 | acc0 = __SMUAD(in1, in1); |
xorjoep | 1:24714b45cd1b | 103 | |
xorjoep | 1:24714b45cd1b | 104 | /* store the result in 3.13 format in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 105 | *pDst++ = (q15_t) (acc0 >> 17); |
xorjoep | 1:24714b45cd1b | 106 | |
xorjoep | 1:24714b45cd1b | 107 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 108 | blkCnt--; |
xorjoep | 1:24714b45cd1b | 109 | } |
xorjoep | 1:24714b45cd1b | 110 | |
xorjoep | 1:24714b45cd1b | 111 | #else |
xorjoep | 1:24714b45cd1b | 112 | |
xorjoep | 1:24714b45cd1b | 113 | /* Run the below code for Cortex-M0 */ |
xorjoep | 1:24714b45cd1b | 114 | q15_t real, imag; /* Temporary variables to store real and imaginary values */ |
xorjoep | 1:24714b45cd1b | 115 | |
xorjoep | 1:24714b45cd1b | 116 | while (numSamples > 0U) |
xorjoep | 1:24714b45cd1b | 117 | { |
xorjoep | 1:24714b45cd1b | 118 | /* out = ((real * real) + (imag * imag)) */ |
xorjoep | 1:24714b45cd1b | 119 | real = *pSrc++; |
xorjoep | 1:24714b45cd1b | 120 | imag = *pSrc++; |
xorjoep | 1:24714b45cd1b | 121 | acc0 = (real * real); |
xorjoep | 1:24714b45cd1b | 122 | acc1 = (imag * imag); |
xorjoep | 1:24714b45cd1b | 123 | /* store the result in 3.13 format in the destination buffer. */ |
xorjoep | 1:24714b45cd1b | 124 | *pDst++ = (q15_t) (((q63_t) acc0 + acc1) >> 17); |
xorjoep | 1:24714b45cd1b | 125 | |
xorjoep | 1:24714b45cd1b | 126 | /* Decrement the loop counter */ |
xorjoep | 1:24714b45cd1b | 127 | numSamples--; |
xorjoep | 1:24714b45cd1b | 128 | } |
xorjoep | 1:24714b45cd1b | 129 | |
xorjoep | 1:24714b45cd1b | 130 | #endif /* #if defined (ARM_MATH_DSP) */ |
xorjoep | 1:24714b45cd1b | 131 | |
xorjoep | 1:24714b45cd1b | 132 | } |
xorjoep | 1:24714b45cd1b | 133 | |
xorjoep | 1:24714b45cd1b | 134 | /** |
xorjoep | 1:24714b45cd1b | 135 | * @} end of cmplx_mag_squared group |
xorjoep | 1:24714b45cd1b | 136 | */ |