1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_q7_to_q31.c
4 * Description: Converts the elements of the Q7 vector to Q31 vector
5 *
6 * $Date: 23 April 2021
7 * $Revision: V1.9.0
8 *
9 * Target Processor: Cortex-M and Cortex-A cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13 *
14 * SPDX-License-Identifier: Apache-2.0
15 *
16 * Licensed under the Apache License, Version 2.0 (the License); you may
17 * not use this file except in compliance with the License.
18 * You may obtain a copy of the License at
19 *
20 * www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28
29 #include "dsp/support_functions.h"
30
31 /**
32 @ingroup groupSupport
33 */
34
35 /**
36 @addtogroup q7_to_x
37 @{
38 */
39
40 /**
41 @brief Converts the elements of the Q7 vector to Q31 vector.
42 @param[in] pSrc points to the Q7 input vector
43 @param[out] pDst points to the Q31 output vector
44 @param[in] blockSize number of samples in each vector
45 @return none
46
47 @par Details
48 The equation used for the conversion process is:
49 <pre>
50 pDst[n] = (q31_t) pSrc[n] << 24; 0 <= n < blockSize.
51 </pre>
52 */
53 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
arm_q7_to_q31(const q7_t * pSrc,q31_t * pDst,uint32_t blockSize)54 void arm_q7_to_q31(
55 const q7_t * pSrc,
56 q31_t * pDst,
57 uint32_t blockSize)
58 {
59 uint32_t blkCnt;
60 q31x4_t vecDst;
61
62 blkCnt = blockSize >> 2;
63 while (blkCnt > 0U)
64 {
65
66 /* C = (q31_t)A << 16 */
67 /* convert from q15 to q31 and then store the results in the destination buffer */
68 /* load q15 + 32-bit widening */
69 vecDst = vldrbq_s32((q7_t const *) pSrc);
70 vecDst = vshlq_n(vecDst, 24);
71 vstrwq_s32(pDst, vecDst);
72
73 /*
74 * Decrement the blockSize loop counter
75 * Advance vector source and destination pointers
76 */
77 pDst += 4;
78 pSrc += 4;
79 blkCnt --;
80 }
81
82 blkCnt = blockSize & 3;
83 while (blkCnt > 0U)
84 {
85 /* C = (q31_t) A << 24 */
86
87 /* Convert from q7 to q31 and store result in destination buffer */
88 *pDst++ = (q31_t) *pSrc++ << 24;
89
90 /* Decrement loop counter */
91 blkCnt--;
92 }
93 }
94
95 #else
arm_q7_to_q31(const q7_t * pSrc,q31_t * pDst,uint32_t blockSize)96 void arm_q7_to_q31(
97 const q7_t * pSrc,
98 q31_t * pDst,
99 uint32_t blockSize)
100 {
101 uint32_t blkCnt; /* Loop counter */
102 const q7_t *pIn = pSrc; /* Source pointer */
103
104 #if defined (ARM_MATH_LOOPUNROLL)
105
106 q31_t in;
107
108 /* Loop unrolling: Compute 4 outputs at a time */
109 blkCnt = blockSize >> 2U;
110
111 while (blkCnt > 0U)
112 {
113 /* C = (q31_t) A << 24 */
114
115 /* Convert from q7 to q31 and store result in destination buffer */
116 in = read_q7x4_ia ((q7_t **) &pIn);
117
118 #ifndef ARM_MATH_BIG_ENDIAN
119
120 *pDst++ = (__ROR(in, 8)) & 0xFF000000;
121 *pDst++ = (__ROR(in, 16)) & 0xFF000000;
122 *pDst++ = (__ROR(in, 24)) & 0xFF000000;
123 *pDst++ = (in & 0xFF000000);
124
125 #else
126
127 *pDst++ = (in & 0xFF000000);
128 *pDst++ = (__ROR(in, 24)) & 0xFF000000;
129 *pDst++ = (__ROR(in, 16)) & 0xFF000000;
130 *pDst++ = (__ROR(in, 8)) & 0xFF000000;
131
132 #endif /* #ifndef ARM_MATH_BIG_ENDIAN */
133
134 /* Decrement loop counter */
135 blkCnt--;
136 }
137
138 /* Loop unrolling: Compute remaining outputs */
139 blkCnt = blockSize % 0x4U;
140
141 #else
142
143 /* Initialize blkCnt with number of samples */
144 blkCnt = blockSize;
145
146 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
147
148 while (blkCnt > 0U)
149 {
150 /* C = (q31_t) A << 24 */
151
152 /* Convert from q7 to q31 and store result in destination buffer */
153 *pDst++ = (q31_t) * pIn++ << 24;
154
155 /* Decrement loop counter */
156 blkCnt--;
157 }
158
159 }
160 #endif /* defined(ARM_MATH_MVEI) */
161
162 /**
163 @} end of q7_to_x group
164 */
165