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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_conj_q15.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_conj_q15.c
10 * Description: Q15 complex conjugate.
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 * @addtogroup cmplx_conj
53 * @brief Q15 complex conjugate.
54 * @param *pSrc points to the input vector
55 * @param *pDst points to the output vector
56 * @param numSamples number of complex samples in each vector
59 * <b>Scaling and Overflow Behavior:</b>
61 * The function uses saturating arithmetic.
62 * The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.
65 void arm_cmplx_conj_q15(
71 #ifndef ARM_MATH_CM0_FAMILY
73 /* Run the below code for Cortex-M4 and Cortex-M3 */
74 uint32_t blkCnt
; /* loop counter */
75 q31_t in1
, in2
, in3
, in4
;
79 blkCnt
= numSamples
>> 2u;
81 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
82 ** a second loop below computes the remaining 1 to 3 samples. */
85 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
86 /* Calculate Complex Conjugate and then store the results in the destination buffer. */
87 in1
= *__SIMD32(pSrc
)++;
88 in2
= *__SIMD32(pSrc
)++;
89 in3
= *__SIMD32(pSrc
)++;
90 in4
= *__SIMD32(pSrc
)++;
92 #ifndef ARM_MATH_BIG_ENDIAN
94 in1
= __QASX(zero
, in1
);
95 in2
= __QASX(zero
, in2
);
96 in3
= __QASX(zero
, in3
);
97 in4
= __QASX(zero
, in4
);
101 in1
= __QSAX(zero
, in1
);
102 in2
= __QSAX(zero
, in2
);
103 in3
= __QSAX(zero
, in3
);
104 in4
= __QSAX(zero
, in4
);
106 #endif // #ifndef ARM_MATH_BIG_ENDIAN
108 in1
= ((uint32_t) in1
>> 16) | ((uint32_t) in1
<< 16);
109 in2
= ((uint32_t) in2
>> 16) | ((uint32_t) in2
<< 16);
110 in3
= ((uint32_t) in3
>> 16) | ((uint32_t) in3
<< 16);
111 in4
= ((uint32_t) in4
>> 16) | ((uint32_t) in4
<< 16);
113 *__SIMD32(pDst
)++ = in1
;
114 *__SIMD32(pDst
)++ = in2
;
115 *__SIMD32(pDst
)++ = in3
;
116 *__SIMD32(pDst
)++ = in4
;
118 /* Decrement the loop counter */
122 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
123 ** No loop unrolling is used. */
124 blkCnt
= numSamples
% 0x4u
;
128 /* C[0]+jC[1] = A[0]+ j (-1) A[1] */
129 /* Calculate Complex Conjugate and then store the results in the destination buffer. */
131 *pDst
++ = __SSAT(-*pSrc
++, 16);
133 /* Decrement the loop counter */
141 /* Run the below code for Cortex-M0 */
143 while(numSamples
> 0u)
145 /* realOut + j (imagOut) = realIn+ j (-1) imagIn */
146 /* Calculate Complex Conjugate and then store the results in the destination buffer. */
149 *pDst
++ = (in
== (q15_t
) 0x8000) ? 0x7fff : -in
;
151 /* Decrement the loop counter */
155 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
160 * @} end of cmplx_conj group