1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_q7_to_q15.c
4 * Description: Converts the elements of the Q7 vector to Q15 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 Q15 vector.
42 @param[in] pSrc points to the Q7 input vector
43 @param[out] pDst points to the Q15 output vector
44 @param[in] blockSize number of samples in each vector
45
46 @par Details
47 The equation used for the conversion process is:
48 <pre>
49 pDst[n] = (q15_t) pSrc[n] << 8; 0 <= n < blockSize.
50 </pre>
51 */
52
53 #if defined(ARM_MATH_MVEI) && !defined(ARM_MATH_AUTOVECTORIZE)
arm_q7_to_q15(const q7_t * pSrc,q15_t * pDst,uint32_t blockSize)54 void arm_q7_to_q15(
55 const q7_t * pSrc,
56 q15_t * pDst,
57 uint32_t blockSize)
58 {
59
60 uint32_t blkCnt; /* loop counters */
61 q15x8_t vecDst;
62 q7_t const *pSrcVec;
63
64
65 pSrcVec = (q7_t const *) pSrc;
66 blkCnt = blockSize >> 3;
67 while (blkCnt > 0U)
68 {
69 /* C = (q15_t) A << 8 */
70 /* convert from q7 to q15 and then store the results in the destination buffer */
71 /* load q7 + 32-bit widening */
72 vecDst = vldrbq_s16(pSrcVec);
73 pSrcVec += 8;
74 vecDst = vecDst << 8;
75 vstrhq(pDst, vecDst);
76 pDst += 8;
77 /*
78 * Decrement the blockSize loop counter
79 */
80 blkCnt--;
81 }
82
83 blkCnt = blockSize & 7;
84 while (blkCnt > 0U)
85 {
86 /* C = (q15_t) A << 8 */
87
88 /* Convert from q7 to q15 and store result in destination buffer */
89 *pDst++ = (q15_t) * pSrcVec++ << 8;
90
91 /* Decrement loop counter */
92 blkCnt--;
93 }
94
95 }
96 #else
arm_q7_to_q15(const q7_t * pSrc,q15_t * pDst,uint32_t blockSize)97 void arm_q7_to_q15(
98 const q7_t * pSrc,
99 q15_t * pDst,
100 uint32_t blockSize)
101 {
102 uint32_t blkCnt; /* Loop counter */
103 const q7_t *pIn = pSrc; /* Source pointer */
104
105 #if defined (ARM_MATH_LOOPUNROLL) && defined (ARM_MATH_DSP)
106 q31_t in;
107 q31_t in1, in2;
108 q31_t out1, out2;
109 #endif
110
111 #if defined (ARM_MATH_LOOPUNROLL)
112
113 /* Loop unrolling: Compute 4 outputs at a time */
114 blkCnt = blockSize >> 2U;
115
116 while (blkCnt > 0U)
117 {
118 /* C = (q15_t) A << 8 */
119
120 /* Convert from q7 to q15 and store result in destination buffer */
121 #if defined (ARM_MATH_DSP)
122
123 in = read_q7x4_ia (&pIn);
124
125 /* rotatate in by 8 and extend two q7_t values to q15_t values */
126 in1 = __SXTB16(__ROR(in, 8));
127
128 /* extend remainig two q7_t values to q15_t values */
129 in2 = __SXTB16(in);
130
131 in1 = in1 << 8U;
132 in2 = in2 << 8U;
133
134 in1 = in1 & 0xFF00FF00;
135 in2 = in2 & 0xFF00FF00;
136
137 #ifndef ARM_MATH_BIG_ENDIAN
138 out2 = __PKHTB(in1, in2, 16);
139 out1 = __PKHBT(in2, in1, 16);
140 #else
141 out1 = __PKHTB(in1, in2, 16);
142 out2 = __PKHBT(in2, in1, 16);
143 #endif
144
145 write_q15x2_ia (&pDst, out1);
146 write_q15x2_ia (&pDst, out2);
147
148 #else
149
150 *pDst++ = (q15_t) *pIn++ << 8;
151 *pDst++ = (q15_t) *pIn++ << 8;
152 *pDst++ = (q15_t) *pIn++ << 8;
153 *pDst++ = (q15_t) *pIn++ << 8;
154
155 #endif /* #if defined (ARM_MATH_DSP) */
156
157 /* Decrement loop counter */
158 blkCnt--;
159 }
160
161 /* Loop unrolling: Compute remaining outputs */
162 blkCnt = blockSize % 0x4U;
163
164 #else
165
166 /* Initialize blkCnt with number of samples */
167 blkCnt = blockSize;
168
169 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
170
171 while (blkCnt > 0U)
172 {
173 /* C = (q15_t) A << 8 */
174
175 /* Convert from q7 to q15 and store result in destination buffer */
176 *pDst++ = (q15_t) * pIn++ << 8;
177
178 /* Decrement loop counter */
179 blkCnt--;
180 }
181
182 }
183 #endif /* defined(ARM_MATH_MVEI) */
184
185 /**
186 @} end of q7_to_x group
187 */
188