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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c
1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
8 * Title: arm_cmplx_mult_cmplx_f32.c
10 * Description: Floating-point complex-by-complex multiplication
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the
23 * - Neither the name of ARM LIMITED nor the names of its contributors
24 * may be used to endorse or promote products derived from this
25 * software without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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38 * POSSIBILITY OF SUCH DAMAGE.
39 * -------------------------------------------------------------------- */
43 * @ingroup groupCmplxMath
47 * @defgroup CmplxByCmplxMult Complex-by-Complex Multiplication
49 * Multiplies a complex vector by another complex vector and generates a complex result.
50 * The data in the complex arrays is stored in an interleaved fashion
51 * (real, imag, real, imag, ...).
52 * The parameter <code>numSamples</code> represents the number of complex
53 * samples processed. The complex arrays have a total of <code>2*numSamples</code>
56 * The underlying algorithm is used:
59 * for(n=0; n<numSamples; n++) {
60 * pDst[(2*n)+0] = pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
61 * pDst[(2*n)+1] = pSrcA[(2*n)+0] * pSrcB[(2*n)+1] + pSrcA[(2*n)+1] * pSrcB[(2*n)+0];
65 * There are separate functions for floating-point, Q15, and Q31 data types.
69 * @addtogroup CmplxByCmplxMult
75 * @brief Floating-point complex-by-complex multiplication
76 * @param[in] *pSrcA points to the first input vector
77 * @param[in] *pSrcB points to the second input vector
78 * @param[out] *pDst points to the output vector
79 * @param[in] numSamples number of complex samples in each vector
83 void arm_cmplx_mult_cmplx_f32(
89 float32_t a1
, b1
, c1
, d1
; /* Temporary variables to store real and imaginary values */
90 uint32_t blkCnt
; /* loop counters */
92 #ifndef ARM_MATH_CM0_FAMILY
94 /* Run the below code for Cortex-M4 and Cortex-M3 */
95 float32_t a2
, b2
, c2
, d2
; /* Temporary variables to store real and imaginary values */
96 float32_t acc1
, acc2
, acc3
, acc4
;
100 blkCnt
= numSamples
>> 2u;
102 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
103 ** a second loop below computes the remaining 1 to 3 samples. */
106 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
107 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
108 a1
= *pSrcA
; /* A[2 * i] */
109 c1
= *pSrcB
; /* B[2 * i] */
111 b1
= *(pSrcA
+ 1); /* A[2 * i + 1] */
112 acc1
= a1
* c1
; /* acc1 = A[2 * i] * B[2 * i] */
114 a2
= *(pSrcA
+ 2); /* A[2 * i + 2] */
115 acc2
= (b1
* c1
); /* acc2 = A[2 * i + 1] * B[2 * i] */
117 d1
= *(pSrcB
+ 1); /* B[2 * i + 1] */
118 c2
= *(pSrcB
+ 2); /* B[2 * i + 2] */
119 acc1
-= b1
* d1
; /* acc1 = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1] */
121 d2
= *(pSrcB
+ 3); /* B[2 * i + 3] */
122 acc3
= a2
* c2
; /* acc3 = A[2 * i + 2] * B[2 * i + 2] */
124 b2
= *(pSrcA
+ 3); /* A[2 * i + 3] */
125 acc2
+= (a1
* d1
); /* acc2 = A[2 * i + 1] * B[2 * i] + A[2 * i] * B[2 * i + 1] */
127 a1
= *(pSrcA
+ 4); /* A[2 * i + 4] */
128 acc4
= (a2
* d2
); /* acc4 = A[2 * i + 2] * B[2 * i + 3] */
130 c1
= *(pSrcB
+ 4); /* B[2 * i + 4] */
131 acc3
-= (b2
* d2
); /* acc3 = A[2 * i + 2] * B[2 * i + 2] - A[2 * i + 3] * B[2 * i + 3] */
132 *pDst
= acc1
; /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1] */
134 b1
= *(pSrcA
+ 5); /* A[2 * i + 5] */
135 acc4
+= b2
* c2
; /* acc4 = A[2 * i + 2] * B[2 * i + 3] + A[2 * i + 3] * B[2 * i + 2] */
137 *(pDst
+ 1) = acc2
; /* C[2 * i + 1] = A[2 * i + 1] * B[2 * i] + A[2 * i] * B[2 * i + 1] */
172 /* Decrement the numSamples loop counter */
176 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
177 ** No loop unrolling is used. */
178 blkCnt
= numSamples
% 0x4u
;
182 /* Run the below code for Cortex-M0 */
185 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
189 /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
190 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
196 /* store the result in the destination buffer. */
197 *pDst
++ = (a1
* c1
) - (b1
* d1
);
198 *pDst
++ = (a1
* d1
) + (b1
* c1
);
200 /* Decrement the numSamples loop counter */
206 * @} end of CmplxByCmplxMult group