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CMSIS DSP library

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cmsis_dsp/ComplexMathFunctions/arm_cmplx_mult_cmplx_q15.c@1:fdd22bb7aa52, 2012-11-28 (annotated)

Committer:
emilmont
Date:
Wed Nov 28 12:30:09 2012 +0000
Revision:
1:fdd22bb7aa52
Child:
2:da51fb522205
DSP library code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:fdd22bb7aa52 1 /* ----------------------------------------------------------------------
emilmont 1:fdd22bb7aa52 2 * Copyright (C) 2010 ARM Limited. All rights reserved.
emilmont 1:fdd22bb7aa52 3 *
emilmont 1:fdd22bb7aa52 4 * $Date: 15. February 2012
emilmont 1:fdd22bb7aa52 5 * $Revision: V1.1.0
emilmont 1:fdd22bb7aa52 6 *
emilmont 1:fdd22bb7aa52 7 * Project: CMSIS DSP Library
emilmont 1:fdd22bb7aa52 8 * Title: arm_cmplx_mult_cmplx_q15.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 1:fdd22bb7aa52 10 * Description: Q15 complex-by-complex multiplication
emilmont 1:fdd22bb7aa52 11 *
emilmont 1:fdd22bb7aa52 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emilmont 1:fdd22bb7aa52 13 *
emilmont 1:fdd22bb7aa52 14 * Version 1.1.0 2012/02/15
emilmont 1:fdd22bb7aa52 15 * Updated with more optimizations, bug fixes and minor API changes.
emilmont 1:fdd22bb7aa52 16 *
emilmont 1:fdd22bb7aa52 17 * Version 1.0.10 2011/7/15
emilmont 1:fdd22bb7aa52 18 * Big Endian support added and Merged M0 and M3/M4 Source code.
emilmont 1:fdd22bb7aa52 19 *
emilmont 1:fdd22bb7aa52 20 * Version 1.0.3 2010/11/29
emilmont 1:fdd22bb7aa52 21 * Re-organized the CMSIS folders and updated documentation.
emilmont 1:fdd22bb7aa52 22 *
emilmont 1:fdd22bb7aa52 23 * Version 1.0.2 2010/11/11
emilmont 1:fdd22bb7aa52 24 * Documentation updated.
emilmont 1:fdd22bb7aa52 25 *
emilmont 1:fdd22bb7aa52 26 * Version 1.0.1 2010/10/05
emilmont 1:fdd22bb7aa52 27 * Production release and review comments incorporated.
emilmont 1:fdd22bb7aa52 28 *
emilmont 1:fdd22bb7aa52 29 * Version 1.0.0 2010/09/20
emilmont 1:fdd22bb7aa52 30 * Production release and review comments incorporated.
emilmont 1:fdd22bb7aa52 31 * -------------------------------------------------------------------- */
emilmont 1:fdd22bb7aa52 32
emilmont 1:fdd22bb7aa52 33 #include "arm_math.h"
emilmont 1:fdd22bb7aa52 34
emilmont 1:fdd22bb7aa52 35 /**
emilmont 1:fdd22bb7aa52 36 * @ingroup groupCmplxMath
emilmont 1:fdd22bb7aa52 37 */
emilmont 1:fdd22bb7aa52 38
emilmont 1:fdd22bb7aa52 39 /**
emilmont 1:fdd22bb7aa52 40 * @addtogroup CmplxByCmplxMult
emilmont 1:fdd22bb7aa52 41 * @{
emilmont 1:fdd22bb7aa52 42 */
emilmont 1:fdd22bb7aa52 43
emilmont 1:fdd22bb7aa52 44 /**
emilmont 1:fdd22bb7aa52 45 * @brief Q15 complex-by-complex multiplication
emilmont 1:fdd22bb7aa52 46 * @param[in] *pSrcA points to the first input vector
emilmont 1:fdd22bb7aa52 47 * @param[in] *pSrcB points to the second input vector
emilmont 1:fdd22bb7aa52 48 * @param[out] *pDst points to the output vector
emilmont 1:fdd22bb7aa52 49 * @param[in] numSamples number of complex samples in each vector
emilmont 1:fdd22bb7aa52 50 * @return none.
emilmont 1:fdd22bb7aa52 51 *
emilmont 1:fdd22bb7aa52 52 * <b>Scaling and Overflow Behavior:</b>
emilmont 1:fdd22bb7aa52 53 * \par
emilmont 1:fdd22bb7aa52 54 * The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format.
emilmont 1:fdd22bb7aa52 55 */
emilmont 1:fdd22bb7aa52 56
emilmont 1:fdd22bb7aa52 57 void arm_cmplx_mult_cmplx_q15(
emilmont 1:fdd22bb7aa52 58 q15_t * pSrcA,
emilmont 1:fdd22bb7aa52 59 q15_t * pSrcB,
emilmont 1:fdd22bb7aa52 60 q15_t * pDst,
emilmont 1:fdd22bb7aa52 61 uint32_t numSamples)
emilmont 1:fdd22bb7aa52 62 {
emilmont 1:fdd22bb7aa52 63 q15_t a, b, c, d; /* Temporary variables to store real and imaginary values */
emilmont 1:fdd22bb7aa52 64
emilmont 1:fdd22bb7aa52 65 #ifndef ARM_MATH_CM0
emilmont 1:fdd22bb7aa52 66
emilmont 1:fdd22bb7aa52 67 /* Run the below code for Cortex-M4 and Cortex-M3 */
emilmont 1:fdd22bb7aa52 68 uint32_t blkCnt; /* loop counters */
emilmont 1:fdd22bb7aa52 69
emilmont 1:fdd22bb7aa52 70 /* loop Unrolling */
emilmont 1:fdd22bb7aa52 71 blkCnt = numSamples >> 2u;
emilmont 1:fdd22bb7aa52 72
emilmont 1:fdd22bb7aa52 73 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emilmont 1:fdd22bb7aa52 74 ** a second loop below computes the remaining 1 to 3 samples. */
emilmont 1:fdd22bb7aa52 75 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 76 {
emilmont 1:fdd22bb7aa52 77 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emilmont 1:fdd22bb7aa52 78 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emilmont 1:fdd22bb7aa52 79 a = *pSrcA++;
emilmont 1:fdd22bb7aa52 80 b = *pSrcA++;
emilmont 1:fdd22bb7aa52 81 c = *pSrcB++;
emilmont 1:fdd22bb7aa52 82 d = *pSrcB++;
emilmont 1:fdd22bb7aa52 83
emilmont 1:fdd22bb7aa52 84 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 85 *pDst++ =
emilmont 1:fdd22bb7aa52 86 (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
emilmont 1:fdd22bb7aa52 87 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 88 *pDst++ =
emilmont 1:fdd22bb7aa52 89 (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
emilmont 1:fdd22bb7aa52 90
emilmont 1:fdd22bb7aa52 91 a = *pSrcA++;
emilmont 1:fdd22bb7aa52 92 b = *pSrcA++;
emilmont 1:fdd22bb7aa52 93 c = *pSrcB++;
emilmont 1:fdd22bb7aa52 94 d = *pSrcB++;
emilmont 1:fdd22bb7aa52 95
emilmont 1:fdd22bb7aa52 96 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 97 *pDst++ =
emilmont 1:fdd22bb7aa52 98 (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
emilmont 1:fdd22bb7aa52 99 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 100 *pDst++ =
emilmont 1:fdd22bb7aa52 101 (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
emilmont 1:fdd22bb7aa52 102
emilmont 1:fdd22bb7aa52 103 a = *pSrcA++;
emilmont 1:fdd22bb7aa52 104 b = *pSrcA++;
emilmont 1:fdd22bb7aa52 105 c = *pSrcB++;
emilmont 1:fdd22bb7aa52 106 d = *pSrcB++;
emilmont 1:fdd22bb7aa52 107
emilmont 1:fdd22bb7aa52 108 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 109 *pDst++ =
emilmont 1:fdd22bb7aa52 110 (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
emilmont 1:fdd22bb7aa52 111 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 112 *pDst++ =
emilmont 1:fdd22bb7aa52 113 (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
emilmont 1:fdd22bb7aa52 114
emilmont 1:fdd22bb7aa52 115 a = *pSrcA++;
emilmont 1:fdd22bb7aa52 116 b = *pSrcA++;
emilmont 1:fdd22bb7aa52 117 c = *pSrcB++;
emilmont 1:fdd22bb7aa52 118 d = *pSrcB++;
emilmont 1:fdd22bb7aa52 119
emilmont 1:fdd22bb7aa52 120 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 121 *pDst++ =
emilmont 1:fdd22bb7aa52 122 (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
emilmont 1:fdd22bb7aa52 123 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 124 *pDst++ =
emilmont 1:fdd22bb7aa52 125 (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
emilmont 1:fdd22bb7aa52 126
emilmont 1:fdd22bb7aa52 127 /* Decrement the blockSize loop counter */
emilmont 1:fdd22bb7aa52 128 blkCnt--;
emilmont 1:fdd22bb7aa52 129 }
emilmont 1:fdd22bb7aa52 130
emilmont 1:fdd22bb7aa52 131 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emilmont 1:fdd22bb7aa52 132 ** No loop unrolling is used. */
emilmont 1:fdd22bb7aa52 133 blkCnt = numSamples % 0x4u;
emilmont 1:fdd22bb7aa52 134
emilmont 1:fdd22bb7aa52 135 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 136 {
emilmont 1:fdd22bb7aa52 137 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emilmont 1:fdd22bb7aa52 138 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emilmont 1:fdd22bb7aa52 139 a = *pSrcA++;
emilmont 1:fdd22bb7aa52 140 b = *pSrcA++;
emilmont 1:fdd22bb7aa52 141 c = *pSrcB++;
emilmont 1:fdd22bb7aa52 142 d = *pSrcB++;
emilmont 1:fdd22bb7aa52 143
emilmont 1:fdd22bb7aa52 144 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 145 *pDst++ =
emilmont 1:fdd22bb7aa52 146 (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
emilmont 1:fdd22bb7aa52 147 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 148 *pDst++ =
emilmont 1:fdd22bb7aa52 149 (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
emilmont 1:fdd22bb7aa52 150
emilmont 1:fdd22bb7aa52 151 /* Decrement the blockSize loop counter */
emilmont 1:fdd22bb7aa52 152 blkCnt--;
emilmont 1:fdd22bb7aa52 153 }
emilmont 1:fdd22bb7aa52 154
emilmont 1:fdd22bb7aa52 155 #else
emilmont 1:fdd22bb7aa52 156
emilmont 1:fdd22bb7aa52 157 /* Run the below code for Cortex-M0 */
emilmont 1:fdd22bb7aa52 158
emilmont 1:fdd22bb7aa52 159 while(numSamples > 0u)
emilmont 1:fdd22bb7aa52 160 {
emilmont 1:fdd22bb7aa52 161 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emilmont 1:fdd22bb7aa52 162 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emilmont 1:fdd22bb7aa52 163 a = *pSrcA++;
emilmont 1:fdd22bb7aa52 164 b = *pSrcA++;
emilmont 1:fdd22bb7aa52 165 c = *pSrcB++;
emilmont 1:fdd22bb7aa52 166 d = *pSrcB++;
emilmont 1:fdd22bb7aa52 167
emilmont 1:fdd22bb7aa52 168 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 169 *pDst++ =
emilmont 1:fdd22bb7aa52 170 (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17);
emilmont 1:fdd22bb7aa52 171 /* store the result in 3.13 format in the destination buffer. */
emilmont 1:fdd22bb7aa52 172 *pDst++ =
emilmont 1:fdd22bb7aa52 173 (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17);
emilmont 1:fdd22bb7aa52 174
emilmont 1:fdd22bb7aa52 175 /* Decrement the blockSize loop counter */
emilmont 1:fdd22bb7aa52 176 numSamples--;
emilmont 1:fdd22bb7aa52 177 }
emilmont 1:fdd22bb7aa52 178
emilmont 1:fdd22bb7aa52 179 #endif /* #ifndef ARM_MATH_CM0 */
emilmont 1:fdd22bb7aa52 180
emilmont 1:fdd22bb7aa52 181 }
emilmont 1:fdd22bb7aa52 182
emilmont 1:fdd22bb7aa52 183 /**
emilmont 1:fdd22bb7aa52 184 * @} end of CmplxByCmplxMult group
emilmont 1:fdd22bb7aa52 185 */