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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_real_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_real_f32.c
10 * Description: Floating-point complex by real 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
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 * -------------------------------------------------------------------- */
44 * @ingroup groupCmplxMath
48 * @defgroup CmplxByRealMult Complex-by-Real Multiplication
50 * Multiplies a complex vector by a real vector and generates a complex result.
51 * The data in the complex arrays is stored in an interleaved fashion
52 * (real, imag, real, imag, ...).
53 * The parameter <code>numSamples</code> represents the number of complex
54 * samples processed. The complex arrays have a total of <code>2*numSamples</code>
55 * real values while the real array has a total of <code>numSamples</code>
58 * The underlying algorithm is used:
61 * for(n=0; n<numSamples; n++) {
62 * pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n];
63 * pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n];
67 * There are separate functions for floating-point, Q15, and Q31 data types.
71 * @addtogroup CmplxByRealMult
77 * @brief Floating-point complex-by-real multiplication
78 * @param[in] *pSrcCmplx points to the complex input vector
79 * @param[in] *pSrcReal points to the real input vector
80 * @param[out] *pCmplxDst points to the complex output vector
81 * @param[in] numSamples number of samples in each vector
85 void arm_cmplx_mult_real_f32(
86 float32_t
* pSrcCmplx
,
88 float32_t
* pCmplxDst
,
91 float32_t in
; /* Temporary variable to store input value */
92 uint32_t blkCnt
; /* loop counters */
94 #ifndef ARM_MATH_CM0_FAMILY
96 /* Run the below code for Cortex-M4 and Cortex-M3 */
97 float32_t inA1
, inA2
, inA3
, inA4
; /* Temporary variables to hold input data */
98 float32_t inA5
, inA6
, inA7
, inA8
; /* Temporary variables to hold input data */
99 float32_t inB1
, inB2
, inB3
, inB4
; /* Temporary variables to hold input data */
100 float32_t out1
, out2
, out3
, out4
; /* Temporary variables to hold output data */
101 float32_t out5
, out6
, out7
, out8
; /* Temporary variables to hold output data */
104 blkCnt
= numSamples
>> 2u;
106 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
107 ** a second loop below computes the remaining 1 to 3 samples. */
110 /* C[2 * i] = A[2 * i] * B[i]. */
111 /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
112 /* read input from complex input buffer */
115 /* read input from real input buffer */
118 /* read input from complex input buffer */
121 /* multiply complex buffer real input with real buffer input */
124 /* read input from complex input buffer */
127 /* multiply complex buffer imaginary input with real buffer input */
130 /* read input from real input buffer */
132 /* read input from complex input buffer */
135 /* multiply complex buffer real input with real buffer input */
138 /* read input from complex input buffer */
140 /* read input from real input buffer */
143 /* multiply complex buffer imaginary input with real buffer input */
146 /* read input from complex input buffer */
149 /* multiply complex buffer real input with real buffer input */
152 /* read input from complex input buffer */
155 /* multiply complex buffer imaginary input with real buffer input */
158 /* read input from real input buffer */
161 /* store result to destination bufer */
164 /* multiply complex buffer real input with real buffer input */
167 /* store result to destination bufer */
170 /* multiply complex buffer imaginary input with real buffer input */
173 /* store result to destination bufer */
178 /* incremnet complex input buffer by 8 to process next samples */
181 /* store result to destination bufer */
184 /* increment real input buffer by 4 to process next samples */
187 /* store result to destination bufer */
191 /* increment destination buffer by 8 to process next sampels */
194 /* Decrement the numSamples loop counter */
198 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
199 ** No loop unrolling is used. */
200 blkCnt
= numSamples
% 0x4u
;
204 /* Run the below code for Cortex-M0 */
207 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
211 /* C[2 * i] = A[2 * i] * B[i]. */
212 /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
214 /* store the result in the destination buffer. */
215 *pCmplxDst
++ = (*pSrcCmplx
++) * (in
);
216 *pCmplxDst
++ = (*pSrcCmplx
++) * (in
);
218 /* Decrement the numSamples loop counter */
224 * @} end of CmplxByRealMult group