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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/SupportFunctions/arm_q7_to_q31.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_q7_to_q31.c
10 * Description: Converts the elements of the Q7 vector to Q31 vector.
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 groupSupport
53 * @brief Converts the elements of the Q7 vector to Q31 vector.
54 * @param[in] *pSrc points to the Q7 input vector
55 * @param[out] *pDst points to the Q31 output vector
56 * @param[in] blockSize length of the input vector
61 * The equation used for the conversion process is:
64 * pDst[n] = (q31_t) pSrc[n] << 24; 0 <= n < blockSize.
75 q7_t
*pIn
= pSrc
; /* Src pointer */
76 uint32_t blkCnt
; /* loop counter */
78 #ifndef ARM_MATH_CM0_FAMILY
82 /* Run the below code for Cortex-M4 and Cortex-M3 */
85 blkCnt
= blockSize
>> 2u;
87 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
88 ** a second loop below computes the remaining 1 to 3 samples. */
91 /* C = (q31_t) A << 24 */
92 /* convert from q7 to q31 and then store the results in the destination buffer */
93 in
= *__SIMD32(pIn
)++;
95 #ifndef ARM_MATH_BIG_ENDIAN
97 *pDst
++ = (__ROR(in
, 8)) & 0xFF000000;
98 *pDst
++ = (__ROR(in
, 16)) & 0xFF000000;
99 *pDst
++ = (__ROR(in
, 24)) & 0xFF000000;
100 *pDst
++ = (in
& 0xFF000000);
104 *pDst
++ = (in
& 0xFF000000);
105 *pDst
++ = (__ROR(in
, 24)) & 0xFF000000;
106 *pDst
++ = (__ROR(in
, 16)) & 0xFF000000;
107 *pDst
++ = (__ROR(in
, 8)) & 0xFF000000;
109 #endif // #ifndef ARM_MATH_BIG_ENDIAN
111 /* Decrement the loop counter */
115 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
116 ** No loop unrolling is used. */
117 blkCnt
= blockSize
% 0x4u
;
121 /* Run the below code for Cortex-M0 */
123 /* Loop over blockSize number of values */
126 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
130 /* C = (q31_t) A << 24 */
131 /* convert from q7 to q31 and then store the results in the destination buffer */
132 *pDst
++ = (q31_t
) * pIn
++ << 24;
134 /* Decrement the loop counter */
141 * @} end of q7_to_x group