Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

ComplexMathFunctions/arm_cmplx_mult_cmplx_q31.c@0:3d9c67d97d6f, 2014-07-28 (annotated)

Committer:
emh203
Date:
Mon Jul 28 15:03:15 2014 +0000
Revision:
0:3d9c67d97d6f
1st working commit.   Had to remove arm_bitreversal2.s     arm_cfft_f32.c and arm_rfft_fast_f32.c.    The .s will not assemble.      For now I removed these functions so we could at least have a library for the other functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emh203 0:3d9c67d97d6f 1 /* ----------------------------------------------------------------------
emh203 0:3d9c67d97d6f 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emh203 0:3d9c67d97d6f 3 *
emh203 0:3d9c67d97d6f 4 * $Date: 12. March 2014
emh203 0:3d9c67d97d6f 5 * $Revision: V1.4.3
emh203 0:3d9c67d97d6f 6 *
emh203 0:3d9c67d97d6f 7 * Project: CMSIS DSP Library
emh203 0:3d9c67d97d6f 8 * Title: arm_cmplx_mult_cmplx_q31.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Q31 complex-by-complex multiplication
emh203 0:3d9c67d97d6f 11 *
emh203 0:3d9c67d97d6f 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emh203 0:3d9c67d97d6f 13 *
emh203 0:3d9c67d97d6f 14 * Redistribution and use in source and binary forms, with or without
emh203 0:3d9c67d97d6f 15 * modification, are permitted provided that the following conditions
emh203 0:3d9c67d97d6f 16 * are met:
emh203 0:3d9c67d97d6f 17 * - Redistributions of source code must retain the above copyright
emh203 0:3d9c67d97d6f 18 * notice, this list of conditions and the following disclaimer.
emh203 0:3d9c67d97d6f 19 * - Redistributions in binary form must reproduce the above copyright
emh203 0:3d9c67d97d6f 20 * notice, this list of conditions and the following disclaimer in
emh203 0:3d9c67d97d6f 21 * the documentation and/or other materials provided with the
emh203 0:3d9c67d97d6f 22 * distribution.
emh203 0:3d9c67d97d6f 23 * - Neither the name of ARM LIMITED nor the names of its contributors
emh203 0:3d9c67d97d6f 24 * may be used to endorse or promote products derived from this
emh203 0:3d9c67d97d6f 25 * software without specific prior written permission.
emh203 0:3d9c67d97d6f 26 *
emh203 0:3d9c67d97d6f 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
emh203 0:3d9c67d97d6f 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
emh203 0:3d9c67d97d6f 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
emh203 0:3d9c67d97d6f 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
emh203 0:3d9c67d97d6f 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
emh203 0:3d9c67d97d6f 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
emh203 0:3d9c67d97d6f 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
emh203 0:3d9c67d97d6f 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
emh203 0:3d9c67d97d6f 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
emh203 0:3d9c67d97d6f 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
emh203 0:3d9c67d97d6f 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emh203 0:3d9c67d97d6f 38 * POSSIBILITY OF SUCH DAMAGE.
emh203 0:3d9c67d97d6f 39 * -------------------------------------------------------------------- */
emh203 0:3d9c67d97d6f 40
emh203 0:3d9c67d97d6f 41 #include "arm_math.h"
emh203 0:3d9c67d97d6f 42
emh203 0:3d9c67d97d6f 43 /**
emh203 0:3d9c67d97d6f 44 * @ingroup groupCmplxMath
emh203 0:3d9c67d97d6f 45 */
emh203 0:3d9c67d97d6f 46
emh203 0:3d9c67d97d6f 47 /**
emh203 0:3d9c67d97d6f 48 * @addtogroup CmplxByCmplxMult
emh203 0:3d9c67d97d6f 49 * @{
emh203 0:3d9c67d97d6f 50 */
emh203 0:3d9c67d97d6f 51
emh203 0:3d9c67d97d6f 52
emh203 0:3d9c67d97d6f 53 /**
emh203 0:3d9c67d97d6f 54 * @brief Q31 complex-by-complex multiplication
emh203 0:3d9c67d97d6f 55 * @param[in] *pSrcA points to the first input vector
emh203 0:3d9c67d97d6f 56 * @param[in] *pSrcB points to the second input vector
emh203 0:3d9c67d97d6f 57 * @param[out] *pDst points to the output vector
emh203 0:3d9c67d97d6f 58 * @param[in] numSamples number of complex samples in each vector
emh203 0:3d9c67d97d6f 59 * @return none.
emh203 0:3d9c67d97d6f 60 *
emh203 0:3d9c67d97d6f 61 * <b>Scaling and Overflow Behavior:</b>
emh203 0:3d9c67d97d6f 62 * \par
emh203 0:3d9c67d97d6f 63 * The function implements 1.31 by 1.31 multiplications and finally output is converted into 3.29 format.
emh203 0:3d9c67d97d6f 64 * Input down scaling is not required.
emh203 0:3d9c67d97d6f 65 */
emh203 0:3d9c67d97d6f 66
emh203 0:3d9c67d97d6f 67 void arm_cmplx_mult_cmplx_q31(
emh203 0:3d9c67d97d6f 68 q31_t * pSrcA,
emh203 0:3d9c67d97d6f 69 q31_t * pSrcB,
emh203 0:3d9c67d97d6f 70 q31_t * pDst,
emh203 0:3d9c67d97d6f 71 uint32_t numSamples)
emh203 0:3d9c67d97d6f 72 {
emh203 0:3d9c67d97d6f 73 q31_t a, b, c, d; /* Temporary variables to store real and imaginary values */
emh203 0:3d9c67d97d6f 74 uint32_t blkCnt; /* loop counters */
emh203 0:3d9c67d97d6f 75 q31_t mul1, mul2, mul3, mul4;
emh203 0:3d9c67d97d6f 76 q31_t out1, out2;
emh203 0:3d9c67d97d6f 77
emh203 0:3d9c67d97d6f 78 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 79
emh203 0:3d9c67d97d6f 80 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82 /* loop Unrolling */
emh203 0:3d9c67d97d6f 83 blkCnt = numSamples >> 2u;
emh203 0:3d9c67d97d6f 84
emh203 0:3d9c67d97d6f 85 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 86 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 87 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 88 {
emh203 0:3d9c67d97d6f 89 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emh203 0:3d9c67d97d6f 90 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emh203 0:3d9c67d97d6f 91 a = *pSrcA++;
emh203 0:3d9c67d97d6f 92 b = *pSrcA++;
emh203 0:3d9c67d97d6f 93 c = *pSrcB++;
emh203 0:3d9c67d97d6f 94 d = *pSrcB++;
emh203 0:3d9c67d97d6f 95
emh203 0:3d9c67d97d6f 96 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 97 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 98 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 99 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 102 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 103 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 104 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 105
emh203 0:3d9c67d97d6f 106 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 107 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 108
emh203 0:3d9c67d97d6f 109 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 110 *pDst++ = out1;
emh203 0:3d9c67d97d6f 111 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 112 *pDst++ = out2;
emh203 0:3d9c67d97d6f 113
emh203 0:3d9c67d97d6f 114 a = *pSrcA++;
emh203 0:3d9c67d97d6f 115 b = *pSrcA++;
emh203 0:3d9c67d97d6f 116 c = *pSrcB++;
emh203 0:3d9c67d97d6f 117 d = *pSrcB++;
emh203 0:3d9c67d97d6f 118
emh203 0:3d9c67d97d6f 119 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 120 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 121 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 122 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 123
emh203 0:3d9c67d97d6f 124 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 125 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 126 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 127 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 128
emh203 0:3d9c67d97d6f 129 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 130 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 131
emh203 0:3d9c67d97d6f 132 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 133 *pDst++ = out1;
emh203 0:3d9c67d97d6f 134 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 135 *pDst++ = out2;
emh203 0:3d9c67d97d6f 136
emh203 0:3d9c67d97d6f 137 a = *pSrcA++;
emh203 0:3d9c67d97d6f 138 b = *pSrcA++;
emh203 0:3d9c67d97d6f 139 c = *pSrcB++;
emh203 0:3d9c67d97d6f 140 d = *pSrcB++;
emh203 0:3d9c67d97d6f 141
emh203 0:3d9c67d97d6f 142 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 143 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 144 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 145 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 146
emh203 0:3d9c67d97d6f 147 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 148 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 149 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 150 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 151
emh203 0:3d9c67d97d6f 152 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 153 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 154
emh203 0:3d9c67d97d6f 155 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 156 *pDst++ = out1;
emh203 0:3d9c67d97d6f 157 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 158 *pDst++ = out2;
emh203 0:3d9c67d97d6f 159
emh203 0:3d9c67d97d6f 160 a = *pSrcA++;
emh203 0:3d9c67d97d6f 161 b = *pSrcA++;
emh203 0:3d9c67d97d6f 162 c = *pSrcB++;
emh203 0:3d9c67d97d6f 163 d = *pSrcB++;
emh203 0:3d9c67d97d6f 164
emh203 0:3d9c67d97d6f 165 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 166 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 167 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 168 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 169
emh203 0:3d9c67d97d6f 170 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 171 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 172 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 173 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 174
emh203 0:3d9c67d97d6f 175 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 176 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 177
emh203 0:3d9c67d97d6f 178 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 179 *pDst++ = out1;
emh203 0:3d9c67d97d6f 180 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 181 *pDst++ = out2;
emh203 0:3d9c67d97d6f 182
emh203 0:3d9c67d97d6f 183 /* Decrement the blockSize loop counter */
emh203 0:3d9c67d97d6f 184 blkCnt--;
emh203 0:3d9c67d97d6f 185 }
emh203 0:3d9c67d97d6f 186
emh203 0:3d9c67d97d6f 187 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 188 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 189 blkCnt = numSamples % 0x4u;
emh203 0:3d9c67d97d6f 190
emh203 0:3d9c67d97d6f 191 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 192 {
emh203 0:3d9c67d97d6f 193 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emh203 0:3d9c67d97d6f 194 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emh203 0:3d9c67d97d6f 195 a = *pSrcA++;
emh203 0:3d9c67d97d6f 196 b = *pSrcA++;
emh203 0:3d9c67d97d6f 197 c = *pSrcB++;
emh203 0:3d9c67d97d6f 198 d = *pSrcB++;
emh203 0:3d9c67d97d6f 199
emh203 0:3d9c67d97d6f 200 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 201 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 202 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 203 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 204
emh203 0:3d9c67d97d6f 205 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 206 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 207 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 208 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 209
emh203 0:3d9c67d97d6f 210 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 211 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 212
emh203 0:3d9c67d97d6f 213 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 214 *pDst++ = out1;
emh203 0:3d9c67d97d6f 215 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 216 *pDst++ = out2;
emh203 0:3d9c67d97d6f 217
emh203 0:3d9c67d97d6f 218 /* Decrement the blockSize loop counter */
emh203 0:3d9c67d97d6f 219 blkCnt--;
emh203 0:3d9c67d97d6f 220 }
emh203 0:3d9c67d97d6f 221
emh203 0:3d9c67d97d6f 222 #else
emh203 0:3d9c67d97d6f 223
emh203 0:3d9c67d97d6f 224 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 225
emh203 0:3d9c67d97d6f 226 /* loop Unrolling */
emh203 0:3d9c67d97d6f 227 blkCnt = numSamples >> 1u;
emh203 0:3d9c67d97d6f 228
emh203 0:3d9c67d97d6f 229 /* First part of the processing with loop unrolling. Compute 2 outputs at a time.
emh203 0:3d9c67d97d6f 230 ** a second loop below computes the remaining 1 sample. */
emh203 0:3d9c67d97d6f 231 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 232 {
emh203 0:3d9c67d97d6f 233 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emh203 0:3d9c67d97d6f 234 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emh203 0:3d9c67d97d6f 235 a = *pSrcA++;
emh203 0:3d9c67d97d6f 236 b = *pSrcA++;
emh203 0:3d9c67d97d6f 237 c = *pSrcB++;
emh203 0:3d9c67d97d6f 238 d = *pSrcB++;
emh203 0:3d9c67d97d6f 239
emh203 0:3d9c67d97d6f 240 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 241 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 242 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 243 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 244
emh203 0:3d9c67d97d6f 245 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 246 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 247 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 248 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 249
emh203 0:3d9c67d97d6f 250 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 251 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 252
emh203 0:3d9c67d97d6f 253 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 254 *pDst++ = out1;
emh203 0:3d9c67d97d6f 255 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 256 *pDst++ = out2;
emh203 0:3d9c67d97d6f 257
emh203 0:3d9c67d97d6f 258 a = *pSrcA++;
emh203 0:3d9c67d97d6f 259 b = *pSrcA++;
emh203 0:3d9c67d97d6f 260 c = *pSrcB++;
emh203 0:3d9c67d97d6f 261 d = *pSrcB++;
emh203 0:3d9c67d97d6f 262
emh203 0:3d9c67d97d6f 263 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 264 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 265 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 266 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 267
emh203 0:3d9c67d97d6f 268 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 269 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 270 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 271 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 272
emh203 0:3d9c67d97d6f 273 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 274 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 275
emh203 0:3d9c67d97d6f 276 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 277 *pDst++ = out1;
emh203 0:3d9c67d97d6f 278 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 279 *pDst++ = out2;
emh203 0:3d9c67d97d6f 280
emh203 0:3d9c67d97d6f 281 /* Decrement the blockSize loop counter */
emh203 0:3d9c67d97d6f 282 blkCnt--;
emh203 0:3d9c67d97d6f 283 }
emh203 0:3d9c67d97d6f 284
emh203 0:3d9c67d97d6f 285 /* If the blockSize is not a multiple of 2, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 286 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 287 blkCnt = numSamples % 0x2u;
emh203 0:3d9c67d97d6f 288
emh203 0:3d9c67d97d6f 289 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 290 {
emh203 0:3d9c67d97d6f 291 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
emh203 0:3d9c67d97d6f 292 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
emh203 0:3d9c67d97d6f 293 a = *pSrcA++;
emh203 0:3d9c67d97d6f 294 b = *pSrcA++;
emh203 0:3d9c67d97d6f 295 c = *pSrcB++;
emh203 0:3d9c67d97d6f 296 d = *pSrcB++;
emh203 0:3d9c67d97d6f 297
emh203 0:3d9c67d97d6f 298 mul1 = (q31_t) (((q63_t) a * c) >> 32);
emh203 0:3d9c67d97d6f 299 mul2 = (q31_t) (((q63_t) b * d) >> 32);
emh203 0:3d9c67d97d6f 300 mul3 = (q31_t) (((q63_t) a * d) >> 32);
emh203 0:3d9c67d97d6f 301 mul4 = (q31_t) (((q63_t) b * c) >> 32);
emh203 0:3d9c67d97d6f 302
emh203 0:3d9c67d97d6f 303 mul1 = (mul1 >> 1);
emh203 0:3d9c67d97d6f 304 mul2 = (mul2 >> 1);
emh203 0:3d9c67d97d6f 305 mul3 = (mul3 >> 1);
emh203 0:3d9c67d97d6f 306 mul4 = (mul4 >> 1);
emh203 0:3d9c67d97d6f 307
emh203 0:3d9c67d97d6f 308 out1 = mul1 - mul2;
emh203 0:3d9c67d97d6f 309 out2 = mul3 + mul4;
emh203 0:3d9c67d97d6f 310
emh203 0:3d9c67d97d6f 311 /* store the real result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 312 *pDst++ = out1;
emh203 0:3d9c67d97d6f 313 /* store the imag result in 3.29 format in the destination buffer. */
emh203 0:3d9c67d97d6f 314 *pDst++ = out2;
emh203 0:3d9c67d97d6f 315
emh203 0:3d9c67d97d6f 316 /* Decrement the blockSize loop counter */
emh203 0:3d9c67d97d6f 317 blkCnt--;
emh203 0:3d9c67d97d6f 318 }
emh203 0:3d9c67d97d6f 319
emh203 0:3d9c67d97d6f 320 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 321
emh203 0:3d9c67d97d6f 322 }
emh203 0:3d9c67d97d6f 323
emh203 0:3d9c67d97d6f 324 /**
emh203 0:3d9c67d97d6f 325 * @} end of CmplxByCmplxMult group
emh203 0:3d9c67d97d6f 326 */