1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_float_to_q15.c
4 * Description: Converts the elements of the floating-point 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_f16.h"
30
31 #if defined(ARM_FLOAT16_SUPPORTED)
32
33
34 /**
35 @ingroup groupSupport
36 */
37
38 /**
39 * @defgroup f16_to_x Convert 16-bit floating point value
40 */
41
42 /**
43 @addtogroup f16_to_x
44 @{
45 */
46
47 /**
48 @brief Converts the elements of the f16 vector to f32 vector.
49 @param[in] pSrc points to the f16 input vector
50 @param[out] pDst points to the f32 output vector
51 @param[in] blockSize number of samples in each vector
52 @return none
53
54 */
55
56 #if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) && defined(__CMSIS_GCC_H)
57 #pragma GCC warning "Scalar version of arm_f16_to_float built. Helium version has build issues with gcc."
58 #endif
59
60 #if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) && !defined(__CMSIS_GCC_H)
61
arm_f16_to_float(const float16_t * pSrc,float32_t * pDst,uint32_t blockSize)62 void arm_f16_to_float(
63 const float16_t * pSrc,
64 float32_t * pDst,
65 uint32_t blockSize)
66 {
67 int32_t blkCnt; /* loop counters */
68 float16x8_t vecDst;
69 float32x4x2_t tmp;
70
71 blkCnt = blockSize >> 3;
72 while (blkCnt > 0)
73 {
74 vecDst = vldrhq_f16(pSrc);
75 pSrc += 8;
76
77 tmp.val[0] = vcvtbq_f32_f16(vecDst);
78 tmp.val[1] = vcvttq_f32_f16(vecDst);
79 vst2q(pDst,tmp);
80
81 pDst += 8;
82 /*
83 * Decrement the blockSize loop counter
84 */
85 blkCnt--;
86 }
87 /*
88 * tail
89 * (will be merged thru tail predication)
90 */
91 blkCnt = blockSize & 7;
92 while (blkCnt > 0)
93 {
94
95 *pDst++ = (float32_t) *pSrc++;
96 /*
97 * Decrement the loop counter
98 */
99 blkCnt--;
100 }
101 }
102
103 #else
arm_f16_to_float(const float16_t * pSrc,float32_t * pDst,uint32_t blockSize)104 void arm_f16_to_float(
105 const float16_t * pSrc,
106 float32_t * pDst,
107 uint32_t blockSize)
108 {
109 const float16_t *pIn = pSrc; /* Src pointer */
110 uint32_t blkCnt; /* loop counter */
111
112 /*
113 * Loop over blockSize number of values
114 */
115 blkCnt = blockSize;
116
117 while (blkCnt > 0U)
118 {
119
120 *pDst++ = (float32_t) * pIn++;
121 /*
122 * Decrement the loop counter
123 */
124 blkCnt--;
125 }
126 }
127 #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
128
129 /**
130 @} end of f16_to_x group
131 */
132
133 #endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
134
135
