1 /*
2 * Copyright (C) 2010-2018 Arm Limited or its affiliates. All rights reserved.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Licensed under the Apache License, Version 2.0 (the License); you may
7 * not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
14 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 /* ----------------------------------------------------------------------
20 * Project: CMSIS NN Library
21 * Title: arm_q7_to_q15_no_shift.c
22 * Description: Converts the elements of the Q7 vector to Q15 vector without left-shift
23 *
24 * $Date: 17. January 2018
25 * $Revision: V.1.0.0
26 *
27 * Target Processor: Cortex-M cores
28 *
29 * -------------------------------------------------------------------- */
30
31 #include "arm_nnsupportfunctions.h"
32
33 /**
34 * @ingroup groupSupport
35 */
36
37 /**
38 * @addtogroup nndata_convert
39 * @{
40 */
41
42 /**
43 * @brief Converts the elements of the Q7 vector to Q15 vector without left-shift
44 * @param[in] *pSrc points to the Q7 input vector
45 * @param[out] *pDst points to the Q15 output vector
46 * @param[in] blockSize length of the input vector
47 * @return none.
48 *
49 * \par Description:
50 *
51 * The equation used for the conversion process is:
52 *
53 * <pre>
54 * pDst[n] = (q15_t) pSrc[n]; 0 <= n < blockSize.
55 * </pre>
56 *
57 */
58
arm_q7_to_q15_no_shift(const q7_t * pSrc,q15_t * pDst,uint32_t blockSize)59 void arm_q7_to_q15_no_shift(const q7_t * pSrc, q15_t * pDst, uint32_t blockSize)
60 {
61 const q7_t *pIn = pSrc; /* Src pointer */
62 uint32_t blkCnt; /* loop counter */
63
64 #ifndef ARM_MATH_CM0_FAMILY
65 q31_t in;
66 q31_t in1, in2;
67 q31_t out1, out2;
68
69 /* Run the below code for Cortex-M4 and Cortex-M3 */
70
71 /*loop Unrolling */
72 blkCnt = blockSize >> 2u;
73
74 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
75 ** a second loop below computes the remaining 1 to 3 samples. */
76 while (blkCnt > 0u)
77 {
78 /* C = (q15_t) A << 8 */
79 /* convert from q7 to q15 and then store the results in the destination buffer */
80 in = *__SIMD32(pIn)++;
81
82 /* rotatate in by 8 and extend two q7_t values to q15_t values */
83 in1 = __SXTB16(__ROR(in, 8));
84
85 /* extend remainig two q7_t values to q15_t values */
86 in2 = __SXTB16(in);
87
88 #ifndef ARM_MATH_BIG_ENDIAN
89
90 out2 = __PKHTB(in1, in2, 16);
91 out1 = __PKHBT(in2, in1, 16);
92
93 #else
94
95 out1 = __PKHTB(in1, in2, 16);
96 out2 = __PKHBT(in2, in1, 16);
97
98 #endif
99
100 *__SIMD32(pDst)++ = out1;
101 *__SIMD32(pDst)++ = out2;
102
103 /* Decrement the loop counter */
104 blkCnt--;
105 }
106
107 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
108 ** No loop unrolling is used. */
109 blkCnt = blockSize % 0x4u;
110
111 #else
112
113 /* Run the below code for Cortex-M0 */
114
115 /* Loop over blockSize number of values */
116 blkCnt = blockSize;
117
118 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
119
120 while (blkCnt > 0u)
121 {
122 /* C = (q15_t) A << 8 */
123 /* convert from q7 to q15 and then store the results in the destination buffer */
124 *pDst++ = (q15_t) * pIn++;
125
126 /* Decrement the loop counter */
127 blkCnt--;
128 }
129
130 }
131
132 /**
133 * @} end of nndata_convert group
134 */
135